.net核心在代码中的任何位置手动解决依赖关系 [英] .net core resolve dependency manually anywhere in the code

问题描述

您知道如何在 .net core 中手动解决依赖性吗?

Do you know how to manually resolve dependencies in .net core? Something like

DependencyResolver.Resolve<ISomeService>()

更新 我在一个没有注入的类中，我想从内部解析它，而不是在各处传递变量

UPDATE I'm in a class that was not injected, I want to resolve it from the inside, rather than pass variables all over the place

推荐答案

在ConfigureServices中添加您的依赖项，如下所示

Add your dependency in ConfigureServices as below

public void ConfigureServices(IServiceCollection services){
    //AddSingleton or AddTransient based on your requirements
    services.AddTransient<ISomeService, ConcreteService>();
}

在您的控制器中或任何地方，在构造器中添加IServiceProvider，如下所示:

In your controller or anywhere, add IServiceProvider in the constructor like below:

using Microsoft.Extensions.DependencyInjection;

...

public class HomeController
{
  ...
  public HomeController(IServiceProvider serviceProvider)
  {
      var service = serviceProvider.GetService<ISomeService>();
  }
}

@Shazam，以下是根据您的评论提供的一些注释或建议:

@Shazam, Here are some notes or suggestions based on your comment:

• 如果因为此类中可能没有构造函数而无法注入，我建议向函数添加参数，并从外部传递已解析的依赖项

• If you can not inject because you might not have a constructor in this class, I woud suggest to add a paramter to your function and pass the resolved dependency from outside

另一个想法是添加一个静态属性并在ConfigureServices

Another Idea is to add a static property and initialize its value in ConfigureServices

例如:

public static class MyClass
{
    public static ISomeService MyServiceObj { set; get; }
    ....
}

在您的ConfigureServices

   public void ConfigureServices(IServiceCollection services){
        services.AddTransient<ISomeService, ConcreteService>();
        MyClass.MyServiceObj = services.GetService<ISomeService>();
    }

希望这会有所帮助，如果您仍然不确定如何操作，请对我的回答进行评分或给我留下评论

Hope this helps, please rate my answer or leave me a comment if you still in doubt how to do it

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