Asp.net Core 2 - 如何在 Asp.net Core 2.0 中使用 ServiceLocator

Question

我的Startup是这样的:

public void ConfigureServices(IServiceCollection services)
{
    // code here 
    Bootstraper.Setup(services);
}

而我的Bootstraperclass是这样的:

public static partial class Bootstraper
{
    // code here 
    public static IServiceCollection CurrentServiceCollection { get;set;}

    public static IServiceProvider CurrentServiceProvider
    {
        get { return CurrentServiceCollection.BuildServiceProvider(); }
    }    

    public static void Setup(IServiceCollection serviceCollection)
    {
        // code here 
        SetupLog();
        InitializeCulture();
        InitializeDbContexts();
        RegisterDataModelRepositories();
    }

这是我的内容 RegisterDataModelRepositories():

CurrentServiceCollection.AddTransient<IDefAccidentGroupRepository>(p => new DefAccidentGroupRepository(ApplicationMainContextId));
CurrentServiceCollection.AddTransient<IDefGenderRepository>(p => new DefGenderRepository(ApplicationMainContextId));

简而言之：我只是希望能够在我的方法中使用服务定位器而不解决 class 构造函数中的依赖关系......有什么办法解决它......

Answer 1

依赖注入也可以在 action 的基础上完成。

引用Dependency injection into controllers: Action Injection with FromServices

Sometimes you don't need a service for more than one action within your controller. In this case, it may make sense to inject the service as a parameter to the action method. This is done by marking the parameter with the attribute [FromServices]

public IActionResult SomeAction([FromServices] IReportService reports) {
    //...use the report service for this action only

    return View();
}

只需确保所需的服务已在服务集合中注册。

services.AddTransient<IDefAccidentGroupRepository>(p => new DefAccidentGroupRepository(ApplicationMainContextId));
services.AddTransient<IDefGenderRepository>(p => new DefGenderRepository(ApplicationMainContextId));
services.AddTransient<IReportService, ReportService>().

Answer 2

好的，谢谢你的帮助... 有一个更简单更好的方法，我只需要添加另一个使用这些存储库的服务，然后在我的控制器中解析该服务并让 Asp.net Core 2.0 DI 为我解决问题 ...

public interface IActionService 
{
   IRepositoryA repA {get;set;}
   IRepositoryB repB { get;set;}

   DoTaskX();
   DoTaskY();
}

然后在我的 ActionService 中：

public class ActionService : IActionService 
{
   public IRepositoryA repA {get;set;}
   public IRepositoryB repB { get;set;}

   public ActionService (IRepositoryA rep_a , IRepositoryB rep_b ) {
      repA = rep_a;
      repB = rep_b;
   }

   DoTaskX(){
    // do task using repository A and B
   }
}

然后我在 Startup.cs 中注册 IActionService 并在我的 ActionController 中解析它，生活变得更轻松，代码变得更清晰......

解决方案很简单，但我必须改变思路才能解决问题...

Asp.net Core 2 - 如何在 Asp.net Core 2.0 中使用 ServiceLocator

Asp.net Core 2 - How to use ServiceLocator in Asp.net Core 2.0

c#

dependency-injection

asp.net-core-2.0

service-locator