Question

ASP.Net Core内置依赖注入功能是否支持服务的自动注册？我不想像这样手动重复它们：

services.Add(new ServiceDescriptor(typeof(IUserService), 
                   new UserService(new AtmDbContext())));

Answer 1

对于我的项目，以下内容帮助了我：

在 Startup.cs 方法配置服务中添加行：

services.AddHandlers("Project name");

并执行：

public static IServiceCollection AddHandlers(this IServiceCollection services, string assemblyName)
{
      var assemblyPath = Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), assemblyName + ".dll");
      var assembly = Assembly.Load(AssemblyLoadContext.GetAssemblyName(assemblyPath));

      var classTypes = assembly.ExportedTypes.Select(t => IntrospectionExtensions.GetTypeInfo(t)).Where(t => t.IsClass && !t.IsAbstract);

      foreach (var type in classTypes)
      {
          var interfaces = type.ImplementedInterfaces.Select(i => i.GetTypeInfo());

          foreach (var handlerType in interfaces.Where(i => i.IsGenericType))
          {
               services.AddTransient(handlerType.AsType(), type.AsType());
          }
      }

      return services;
}

Answer 2

我也很生气并为此建立了一个开源项目，看看：

https://github.com/SharpTools/SharpDiAutoRegister

只需添加nuget包SharpDiAutoRegister并在ConfigureServices方法中添加您的约定：

services.ForInterfacesMatching("^I[a-zA-z]+Repository$")
        .OfAssemblies(Assembly.GetExecutingAssembly())
        .AddSingletons();

services.ForInterfacesMatching("^IRepository")
        .OfAssemblies(Assembly.GetExecutingAssembly())
        .AddTransients();

//and so on...

DependencyInjection是否支持服务的自动注册？

2 个答案: