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Eric Pattison 2025-06-03 14:45:21 -06:00
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namespace Microsoft.Extensions.DependencyInjection;
public static class DecorateServiceCollectionExtensions
{
public static IServiceCollection DecorateIf(this IServiceCollection services, bool condition, Type serviceType, Type decoratorType)
=> DecorateIf(services, (sp) => condition, serviceType, decoratorType);
public static IServiceCollection DecorateIf(this IServiceCollection services, bool condition, Type serviceType, Func<IServiceProvider, object, object> decoratorFactory)
=> DecorateIf(services, (sp) => condition, serviceType, decoratorFactory);
public static IServiceCollection DecorateIf<TService, TDecorator>(this IServiceCollection services, bool condition)
where TService : class
where TDecorator : class, TService
=> DecorateIf(services, (sp) => condition, typeof(TService), typeof(TDecorator));
public static IServiceCollection DecorateIf<TService>(this IServiceCollection services, bool condition, Func<IServiceProvider, TService, TService> decoratorFactory)
where TService : class
=> DecorateIf(services, (sp) => condition, typeof(TService), (sp, s) => decoratorFactory(sp, (TService)s));
public static IServiceCollection DecorateIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TService, TService> decoratorFactory)
where TService : class
=> DecorateIf(services, condition, typeof(TService), (sp, s) => decoratorFactory(sp, (TService)s));
public static IServiceCollection DecorateIf<TService, TDecorator>(this IServiceCollection services, Func<IServiceProvider, bool> condition)
where TService : class
where TDecorator : class, TService
=> DecorateIf(services, condition, typeof(TService), typeof(TDecorator));
public static IServiceCollection DecorateIf<TService, TDecorator>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TService, TDecorator> decoratorFactory)
where TService : class
where TDecorator : class, TService
=> DecorateIf(services, condition, typeof(TService), (sp, s) => decoratorFactory(sp, (TService)s));
public static IServiceCollection DecorateIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Type decoratorType)
{
ServiceDescriptor? wrappedDescriptor = services.LastOrDefault(s => s.ServiceType == serviceType);
if (wrappedDescriptor == null)
{
throw new InvalidOperationException($"Cannot decorate type {serviceType} because it is not registered.");
}
var factory = ActivatorUtilities.CreateFactory(decoratorType, new[] { wrappedDescriptor.ImplementationType! });
services.Replace(
ServiceDescriptor.Describe(
serviceType,
(sp) => condition(sp) ? factory(sp, new[] { ServiceDescriptorExtensions.CreateInstance(sp, wrappedDescriptor) }) :
ActivatorUtilities.CreateInstance(sp, wrappedDescriptor.ImplementationType!),
wrappedDescriptor.Lifetime
)
);
return services;
}
public static IServiceCollection DecorateIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Func<IServiceProvider, object, object> decoratorFactory)
{
ServiceDescriptor? wrappedDescriptor = services.LastOrDefault(s => s.ServiceType == serviceType);
if (wrappedDescriptor == null)
{
throw new InvalidOperationException($"Cannot decorate type {serviceType} because it is not registered.");
}
services.Replace(
ServiceDescriptor.Describe(
serviceType,
(sp) => condition(sp) ?
decoratorFactory(sp, ServiceDescriptorExtensions.CreateInstance(sp, wrappedDescriptor)) :
ActivatorUtilities.CreateInstance(sp, wrappedDescriptor.ImplementationType!),
wrappedDescriptor.Lifetime
)
);
return services;
}
public static IServiceCollection DecorateIf<TService, TDecorator>(this IServiceCollection services, bool condition, Func<IServiceProvider, TService, TDecorator> decoratorFactory)
{
ServiceDescriptor? wrappedDescriptor = services.LastOrDefault(d => d.ServiceType == typeof(TService));
if (wrappedDescriptor == null)
{
throw new InvalidOperationException($"Cannot decorate type {typeof(TService)} because it is not registered.");
}
services.Replace(
ServiceDescriptor.Describe(
typeof(TService),
(sp) => condition ?
decoratorFactory(sp, (TService)ServiceDescriptorExtensions.CreateInstance(sp, wrappedDescriptor))! :
ActivatorUtilities.CreateInstance(sp, wrappedDescriptor.ImplementationType!),
wrappedDescriptor.Lifetime
)
);
return services;
}
/// <summary>
/// Decorates a service of type <paramref name="serviceType"/>
/// with a decorator of type <paramref name="decoratorType"/>.
/// </summary>
/// <param name="services"></param>
/// <param name="serviceType"></param>
/// <param name="decoratorType"></param>
/// <returns></returns>
/// <exception cref="InvalidOperationException"></exception>
public static IServiceCollection Decorate(this IServiceCollection services, Type serviceType, Type decoratorType)
{
var wrappedDescriptor = services.LastOrDefault(d => d.ServiceType == serviceType);
if (wrappedDescriptor == null)
{
throw new InvalidOperationException($"Cannot decorate type {serviceType} because it is not registered.");
}
services.Replace(
ServiceDescriptor.Describe(
serviceType,
(sp) => ActivatorUtilities.CreateInstance(sp, decoratorType, new[] { ServiceDescriptorExtensions.CreateInstance(sp, wrappedDescriptor) }),
wrappedDescriptor.Lifetime
)
);
return services;
}
/// <summary>
/// Decorates a service of type <paramref name="serviceType"/>
/// with a decorator returned by <paramref name="decoratorFactory"/>.
/// </summary>
/// <param name="services"></param>
/// <param name="serviceType"></param>
/// <param name="decoratorFactory"></param>
/// <returns></returns>
/// <exception cref="InvalidOperationException"></exception>
public static IServiceCollection Decorate(this IServiceCollection services, Type serviceType, Func<IServiceProvider, object, object> decoratorFactory)
{
var wrappedDescriptor = services.LastOrDefault(d => d.ServiceType == serviceType);
if (wrappedDescriptor == null)
{
throw new InvalidOperationException($"Cannot decorate type {serviceType} because it is not registered.");
}
services.Replace(
ServiceDescriptor.Describe(
serviceType,
(sp) => decoratorFactory(sp, ServiceDescriptorExtensions.CreateInstance(sp, wrappedDescriptor)),
wrappedDescriptor.Lifetime
)
);
return services;
}
/// <summary>
/// Decorates a service of type <typeparamref name="TService"/>
/// with a decorator of type <typeparamref name="TDecorator"/>.
/// </summary>
/// <typeparam name="TService"></typeparam>
/// <typeparam name="TDecorator"></typeparam>
/// <param name="services"></param>
/// <returns></returns>
/// <exception cref="InvalidOperationException"></exception>
public static IServiceCollection Decorate<TService, TDecorator>(this IServiceCollection services)
where TService : class
where TDecorator : class, TService
{
var wrappedDescriptor = services.LastOrDefault(d => d.ServiceType == typeof(TService));
if (wrappedDescriptor == null)
{
throw new InvalidOperationException($"Cannot decorate type {typeof(TService)} because it is not registered.");
}
services.RemoveAt(services.IndexOf(wrappedDescriptor));
services.Add(
ServiceDescriptor.Describe(
typeof(TService),
(sp) => ActivatorUtilities.CreateInstance(sp, typeof(TDecorator), new[] { ServiceDescriptorExtensions.CreateInstance(sp, wrappedDescriptor) }),
wrappedDescriptor.Lifetime
)
);
return services;
}
public static IServiceCollection Decorate<TService, TDecorator>(this IServiceCollection services, Func<IServiceProvider, TService, TDecorator> decoratorFactory)
where TService : class
where TDecorator : class, TService
{
var wrappedDescriptor = services.LastOrDefault(d => d.ServiceType == typeof(TService));
if (wrappedDescriptor == null)
{
throw new InvalidOperationException($"Cannot decorate type {typeof(TService)} because it is not registered.");
}
services.RemoveAt(services.IndexOf(wrappedDescriptor));
services.Add(
ServiceDescriptor.Describe(
typeof(TService),
(sp) => decoratorFactory(sp, (TService)ServiceDescriptorExtensions.CreateInstance(sp, wrappedDescriptor)),
wrappedDescriptor.Lifetime
)
);
return services;
}
}

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.5" />
</ItemGroup>
</Project>

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global using Microsoft.Extensions.DependencyInjection;
global using Microsoft.Extensions.DependencyInjection.Extensions;

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namespace Microsoft.Extensions.DependencyInjection;
/// <summary>
/// Extension methods for adding services to an <see cref="IServiceCollection" />.
/// Allows for conditional registration of services based on a boolean condition evaluated at injection time.
/// </summary>
public static partial class ConditionalServiceCollectionExtensions
{
/// <summary>
/// Adds a scoped service of the type specified in <paramref name="serviceType"/> with an
/// implementation of the type specified in <paramref name="implementationType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationType">The implementation type of the service.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf(this IServiceCollection services, bool condition, Type serviceType, Type implementationType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationType, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <paramref name="serviceType"/> with an
/// implementation of the type specified in <paramref name="implementationType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationType">The implementation type of the service.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Type implementationType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationType, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <paramref name="serviceType"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf(this IServiceCollection services, bool condition, Type serviceType, Func<IServiceProvider, object> implementationFactory)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationFactory, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <paramref name="serviceType"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Func<IServiceProvider, object> implementationFactory)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationFactory, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService, TImplementation>(this IServiceCollection services, bool condition)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TImplementation), ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService, TImplementation>(this IServiceCollection services, Func<IServiceProvider, bool> condition)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TImplementation), ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <paramref name="serviceType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf(this IServiceCollection services, bool condition, Type serviceType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, serviceType, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <paramref name="serviceType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, serviceType, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService>(this IServiceCollection services, bool condition)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TService), ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TService), ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService>(this IServiceCollection services, bool condition, Func<IServiceProvider, TService> implementationFactory)
where TService : class
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TService> implementationFactory)
where TService : class
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> using the
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService, TImplementation>(this IServiceCollection services, bool condition, Func<IServiceProvider, TImplementation> implementationFactory)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Scoped);
/// <summary>
/// Adds a scoped service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> using the
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddScopedIf<TService, TImplementation>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TImplementation> implementationFactory)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Scoped);
}

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namespace Microsoft.Extensions.DependencyInjection;
internal static class ServiceDescriptorExtensions
{
public static object CreateInstance(IServiceProvider sp, ServiceDescriptor sd)
{
if (sd.ImplementationInstance != null) return sd.ImplementationInstance;
if (sd.ImplementationFactory != null) return sd.ImplementationFactory(sp);
return ActivatorUtilities.CreateInstance(sp, sd.ImplementationType!);
}
public static IServiceCollection AddIf(IServiceCollection services, bool condition, Type serviceType, Type implementationType, ServiceLifetime lifetime)
=> AddIf(services, (sp) => condition, serviceType, implementationType, lifetime);
public static IServiceCollection AddIf(IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Type implementationType, ServiceLifetime lifetime)
{
var existingDescriptor = services.LastOrDefault(d => d.ServiceType == serviceType);
if (existingDescriptor == null)
{
throw new InvalidOperationException($"Cannot replace service of type {serviceType} with {implementationType} since no type of {serviceType} has been registered yet.");
}
services.RemoveAt(services.IndexOf(existingDescriptor));
services.Add(
ServiceDescriptor.Describe(
serviceType,
(sp) => condition(sp) ? ActivatorUtilities.CreateInstance(sp, implementationType) :
CreateInstance(sp, existingDescriptor),
lifetime
)
);
return services;
}
public static IServiceCollection AddIf(IServiceCollection services, bool condition, Type serviceType, Func<IServiceProvider, object> implementationFactory, ServiceLifetime lifetime)
=> AddIf(services, (sp) => condition, serviceType, implementationFactory, lifetime);
public static IServiceCollection AddIf(IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Func<IServiceProvider, object> implementationFactory, ServiceLifetime lifetime)
{
ServiceDescriptor? existingDescriptor = services.LastOrDefault(s => s.ServiceType == serviceType);
if(existingDescriptor == null)
{
throw new InvalidOperationException($"Cannot replace service of type {serviceType} since no type of {serviceType} has been registered yet.");
}
services.RemoveAt(services.IndexOf(existingDescriptor));
services.Add(
ServiceDescriptor.Describe(
serviceType,
(sp) => condition(sp) ? CreateInstance(sp, new ServiceDescriptor(serviceType, implementationFactory, lifetime))
: CreateInstance(sp, existingDescriptor),
lifetime
)
);
return services;
}
}

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namespace Microsoft.Extensions.DependencyInjection;
/// <summary>
/// Extension methods for adding services to an <see cref="IServiceCollection" />.
/// Allows for conditional registration of services based on a boolean condition evaluated at injection time.
/// </summary>
public static partial class ConditionalServiceCollectionExtensions
{
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> with an
/// implementation of the type specified in <paramref name="implementationType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationType">The implementation type of the service.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, bool condition, Type serviceType, Type implementationType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationType, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> with an
/// implementation of the type specified in <paramref name="implementationType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationType">The implementation type of the service.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Type implementationType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationType, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, bool condition, Type serviceType, Func<IServiceProvider, object> implementationFactory)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationFactory, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Func<IServiceProvider, object> implementationFactory)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationFactory, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService, TImplementation>(this IServiceCollection services, bool condition)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TImplementation), ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService, TImplementation>(this IServiceCollection services, Func<IServiceProvider, bool> condition)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TImplementation), ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, bool condition, Type serviceType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, serviceType, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, serviceType, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService>(this IServiceCollection services, bool condition)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TService), ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TService), ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService>(this IServiceCollection services, bool condition, Func<IServiceProvider, TService> implementationFactory)
where TService : class
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TService> implementationFactory)
where TService : class
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> using the
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService, TImplementation>(this IServiceCollection services, bool condition, Func<IServiceProvider, TImplementation> implementationFactory)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> using the
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService, TImplementation>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TImplementation> implementationFactory)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> with an
/// instance specified in <paramref name="implementationInstance"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationInstance"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, bool condition, Type serviceType, object implementationInstance)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, (sp) => implementationInstance, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <paramref name="serviceType"/> with an
/// instance specified in <paramref name="implementationInstance"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationInstance"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, object implementationInstance)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, (sp) => implementationInstance, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with an
/// instance specified in <paramref name="implementationInstance"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationInstance"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService>(this IServiceCollection services, bool condition, object implementationInstance)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), (sp) => implementationInstance, ServiceLifetime.Singleton);
/// <summary>
/// Adds a singleton service of the type specified in <typeparamref name="TService"/> with an
/// instance specified in <paramref name="implementationInstance"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationInstance"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddSingletonIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition, object implementationInstance)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), (sp) => implementationInstance, ServiceLifetime.Singleton);
}

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namespace Microsoft.Extensions.DependencyInjection;
/// <summary>
/// Extension methods for adding services to an <see cref="IServiceCollection" />.
/// Allows for conditional registration of services based on a boolean condition evaluated at injection time.
/// </summary>
public static partial class ConditionalServiceCollectionExtensions
{
/// <summary>
/// Adds a transient service of the type specified in <paramref name="serviceType"/> with an
/// implementation of the type specified in <paramref name="implementationType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationType">The implementation type of the service.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf(this IServiceCollection services, bool condition, Type serviceType, Type implementationType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationType, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <paramref name="serviceType"/> with an
/// implementation of the type specified in <paramref name="implementationType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationType">The implementation type of the service.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Type implementationType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationType, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <paramref name="serviceType"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf(this IServiceCollection services, bool condition, Type serviceType, Func<IServiceProvider, object> implementationFactory)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationFactory, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <paramref name="serviceType"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType, Func<IServiceProvider, object> implementationFactory)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, implementationFactory, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService, TImplementation>(this IServiceCollection services, bool condition)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TImplementation), ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService, TImplementation>(this IServiceCollection services, Func<IServiceProvider, bool> condition)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TImplementation), ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <paramref name="serviceType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf(this IServiceCollection services, bool condition, Type serviceType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, serviceType, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <paramref name="serviceType"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="serviceType">The type of the service to register.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf(this IServiceCollection services, Func<IServiceProvider, bool> condition, Type serviceType)
=> ServiceDescriptorExtensions.AddIf(services, condition, serviceType, serviceType, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService>(this IServiceCollection services, bool condition)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TService), ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition)
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), typeof(TService), ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService>(this IServiceCollection services, bool condition, Func<IServiceProvider, TService> implementationFactory)
where TService : class
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> with a
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TService> implementationFactory)
where TService : class
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> using the
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> is <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService, TImplementation>(this IServiceCollection services, bool condition, Func<IServiceProvider, TImplementation> implementationFactory)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Transient);
/// <summary>
/// Adds a transient service of the type specified in <typeparamref name="TService"/> with an
/// implementation of the type specified in <typeparamref name="TImplementation"/> using the
/// factory specified in <paramref name="implementationFactory"/> to the
/// specified <see cref="IServiceCollection"/> collection to be used
/// if the specified <paramref name="condition"/> evaluates to <c>true</c>.
/// </summary>
/// <typeparam name="TService">The type of the service to add.</typeparam>
/// <typeparam name="TImplementation">The type of the implementation to use.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the service to.</param>
/// <param name="condition">The condition to evaluate.</param>
/// <param name="implementationFactory"></param>
/// <returns>The <see cref="IServiceCollection"/> the service was added to.</returns>
public static IServiceCollection AddTransientIf<TService, TImplementation>(this IServiceCollection services, Func<IServiceProvider, bool> condition, Func<IServiceProvider, TImplementation> implementationFactory)
where TService : class
where TImplementation : class, TService
=> ServiceDescriptorExtensions.AddIf(services, condition, typeof(TService), implementationFactory, ServiceLifetime.Transient);
}

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@ -0,0 +1,25 @@

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