.NET Core DI，将参数传递给构造函数的方法

问题描述：

具有以下服务构造函数

public class Service : IService
{
     public Service(IOtherService service1, IAnotherOne service2, string arg)
     {

     }
}

使用.NET Core IOC机制传递参数的选择有哪些

What are the choices of passing the parameters using .NET Core IOC mechanism

_serviceCollection.AddSingleton<IOtherService , OtherService>();
_serviceCollection.AddSingleton<IAnotherOne , AnotherOne>();
_serviceCollection.AddSingleton<IService>(x=>new Service( _serviceCollection.BuildServiceProvider().GetService<IOtherService>(), _serviceCollection.BuildServiceProvider().GetService<IAnotherOne >(), "" ));

还有其他方法吗？

答

工厂委托的表达式参数（在这种情况下为 x ）是 IServiceProvider 。

The expression parameter (x in this case), of the factory delegate is a IServiceProvider.

使用它来解决依赖关系，

Use that to resolve the dependencies,

_serviceCollection.AddSingleton<IService>(x => 
    new Service(x.GetRequiredService<IOtherService>(),
                x.GetRequiredService<IAnotherOne>(), 
                ""));

工厂委托是延迟调用。每当要解析类型时，它将通过完整的提供程序作为委托参数。

The factory delegate is a delayed invocation. When ever the type is to be resolved it will pass the completed provider as the delegate parameter.

.NET Core DI，将参数传递给构造函数的方法

相关推荐