使用Unity代替ASP.NET Core DI服务收集

Question

越来越多的。NET核心库绑定到IServiceCollection。例如，我想使用在我的NET Framework4.7.1中描述的HttpClientFactory。桌面应用程序。我的应用程序正在使用Unity IOC。我将microsoft.extensions.http引用为nuGet。

但存在一个问题:新的ASP.NET核心组件绑定到Microsoft DI framework for.netcore-IServiceCollection。在示例中，HttpClientFactory的注册如下:

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpClient();
}

我正在更深入地研究MS代码，并想手动地向Unity注册相应的接口和类。这是IServiceCollection注册服务的方式:

services.TryAddTransient<HttpMessageHandlerBuilder, DefaultHttpMessageHandlerBuilder>();
services.TryAddSingleton<IHttpClientFactory, DefaultHttpClientFactory>();

将其移到Unity IoC没有问题，但当我想注册具有内部可见性的DefaultHttpMessageHandlerBuilder和DefaultHttpClientFactory时，我就会感到很尴尬。因此它们不能在MS Code之外注册。

我有机会如何解决这种情况吗？

Answer 1

您有两个选项:

>

创建ServiceCollection，添加工厂，然后调用BuildServiceProvider并解析IHttpClientFactory。这里有一个uber示例https://github.com/aspnet/httpclientfactory/blob/64ed5889635b07b61923ed5fd9c8b69c997deac0/samples/httpclientfactorysample/program.cs#l21。

将unity适配器用于IServiceCollectionhttps://www.nuget.org/packages/unity.microsoft.dependencyinjection/。

Answer 2

基于@DavidFowl答案，我使用了他的第二个解决方案并完成了代码:

这些包需要从我的项目中引用（代码片段来自。csproj）:

 <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Http">
      <Version>2.1.1</Version>
    </PackageReference>
    <PackageReference Include="Unity.Microsoft.DependencyInjection">
      <Version>2.0.10</Version>
    </PackageReference>
  </ItemGroup>

下面是从Unity容器解析来自ServiceCollection的服务的测试:

using System;
using System.Linq;
using System.Net.Http;
using Microsoft.Extensions.DependencyInjection;
using Unity;
using Unity.Microsoft.DependencyInjection;
using Xunit;

namespace FunctionalTests
{
    public class UnityWithHttpClientFactoryTest
    {

        /// <summary>
        /// Integration of Unity container with MS ServiceCollection test
        /// </summary>
        [Fact]
        public void HttpClientCanBeCreatedByUnity()
        {
            UnityContainer unityContainer = new UnityContainer();

            ServiceCollection serviceCollection = new ServiceCollection();
            serviceCollection.AddHttpClient("Google", (c) =>
            {
                c.BaseAddress = new Uri("https://google.com/");
            });
            serviceCollection.BuildServiceProvider(unityContainer);

            Assert.True(unityContainer.IsRegistered<IHttpClientFactory>());
            IHttpClientFactory clientFactory = unityContainer.Resolve<IHttpClientFactory>();
            HttpClient httpClient = clientFactory.CreateClient("Google");

            Assert.NotNull(httpClient);
            Assert.Equal("https://google.com/", httpClient.BaseAddress.ToString());

        }

    }
}