ServiceProviderExtensions Class

Definition

Namespace

Cuemon.Extensions.DependencyInjection

Assemblies

Cuemon.Extensions.DependencyInjection.dll

Source

src/Cuemon.Extensions.DependencyInjection/ServiceProviderExtensions.cs

Extension methods for the IServiceProvider interface.

public static class ServiceProviderExtensions

Inheritance

object

ServiceProviderExtensions

Examples

The following example wraps the built service provider and then uses GetServiceDescriptors() to inspect the registrations that were added to the container. It registers singleton and scoped services in a ServiceCollection, builds the provider, and wraps it in a DelegatingServiceProvider. The wrapped provider's descriptors are queried for the registered types, and the results are written to the console, showing how to introspect service registrations at runtime.

using System;
using System.Linq;
using Cuemon.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;

namespace Cuemon.Docs.Samples.DependencyInjection
{
    public static class ServiceProviderExtensionsExample
    {
        public static void Demonstrate()
        {
            var services = new ServiceCollection();
            services.AddSingleton<IClock, SystemClock>();
            services.AddScoped<IJobRepository, InMemoryJobRepository>();

            using var provider = services.BuildServiceProvider();
            var wrappedProvider = new DelegatingServiceProvider(provider);

            var descriptors = wrappedProvider.GetServiceDescriptors().ToList();

            Console.WriteLine(descriptors.Any(descriptor => descriptor.ServiceType == typeof(IClock)));
            Console.WriteLine(descriptors.Any(descriptor => descriptor.ServiceType == typeof(IJobRepository)));
        }

        public interface IClock
        {
        }

        public sealed class SystemClock : IClock
        {
        }

        public interface IJobRepository
        {
        }

        public sealed class InMemoryJobRepository : IJobRepository
        {
        }

        private sealed class DelegatingServiceProvider : IServiceProvider
        {
            private readonly IServiceProvider _provider;

            public DelegatingServiceProvider(IServiceProvider provider)
            {
                _provider = provider;
            }

            public object GetService(Type serviceType)
            {
                return _provider.GetService(serviceType);
            }
        }
    }
}

Methods

Name	Description
GetServiceDescriptors(IServiceProvider)	Gets an enumeration of ALL ServiceDescriptor instances from the specified provider.