依赖注入按名称解析 [英] Dependency injection resolving by name

问题描述

例如，我可以：
定义 IRepository

  container.RegisterType< IRepository，TestSuiteRepositor（TestSuiteRepository）; 
 container.RegisterType< IRepository，BaseRepository>（）; 
  

并调用需要的实现

  public BaselineManager（[Dependency（TestSuiteRepository）] IRepository仓库
  

解决方案

正如@Tseng所指出的，没有内置的解决方案来命名绑定。但是使用工厂方法可能对您的情况有帮助。示例应该如下所示：

创建存储库解析器：

  public interface IRepositoryResolver 
 {
 IRepository GetRepositoryByName（string name）; 
} 
 
 public class RepositoryResolver：IRepositoryResolver 
 {
 private readonly IServiceProvider _serviceProvider; 
 public RepositoryResolver（IServiceProvider serviceProvider）
 {
 _serviceProvider = serviceProvider; 
} 
 public IRepository GetRepositoryByName（string name）
 {
 if（name ==TestSuiteRepository）
返回_serviceProvider.GetService< TestSuiteRepositor>（）; 
 // ...其他条件
 else 
返回_serviceProvider.GetService< BaseRepositor>（）; 
} 
 
} 
  

在<$ c中注册所需的服务$ c> ConfigureServices.cs

  services.AddSingleton< IRepositoryResolver，RepositoryResolver>（）; 
 services.AddTransient< TestSuiteRepository>（）; 
 services.AddTransient< BaseRepository>（）; 
  

最后在任何类中使用它：

  public class BaselineManager 
 {
 private readonly IRepository _repository; 
 
 public BaselineManager（IRepositoryResolver repositoryResolver）
 {
 _repository = repositoryResolver.GetRepositoryByName（TestSuiteRepository）; 
} 
} 
  

How I can inject different implementation of object for specific class?

For example in unity I can: Define two implementation of IRepository

container.RegisterType<IRepository, TestSuiteRepositor("TestSuiteRepository");
container.RegisterType<IRepository, BaseRepository>(); 

and call needed implementation

public BaselineManager([Dependency("TestSuiteRepository")]IRepository repository)

解决方案

As @Tseng pointed, there is no built-in solution for named binding. However using factory method may be helpful for your case. Example should be something like below:

Create a repository resolver:

public interface IRepositoryResolver
{
    IRepository GetRepositoryByName(string name);
}

public class RepositoryResolver : IRepositoryResolver 
{
    private readonly IServiceProvider _serviceProvider;
    public RepositoryResolver(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }
    public IRepository GetRepositoryByName(string name)
    {
         if(name == "TestSuiteRepository") 
           return _serviceProvider.GetService<TestSuiteRepositor>();
         //... other condition
         else
           return _serviceProvider.GetService<BaseRepositor>();
    }

}

Register needed services in ConfigureServices.cs

services.AddSingleton<IRepositoryResolver, RepositoryResolver>();
services.AddTransient<TestSuiteRepository>();
services.AddTransient<BaseRepository>(); 

Finally use it in any class:

public class BaselineManager
{
    private readonly IRepository _repository;

    public BaselineManager(IRepositoryResolver repositoryResolver)
    {
        _repository = repositoryResolver.GetRepositoryByName("TestSuiteRepository");
    }
}

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