.NET Core DI，将参数传递给构造函数的方法 [英] .NET Core DI, ways of passing parameters to constructor

问题描述

具有以下服务构造函数

公共类服务:IService{公共服务(IOtherService service1，IAnotherOne service2，字符串arg){}}

使用.NET Core IOC机制传递参数有哪些选择

services.AddSingleton();services.AddSingleton();services.AddSingleton(x =>新服务(services.BuildServiceProvider().GetService(),services.BuildServiceProvider().GetService(),"));

还有什么办法吗?

解决方案

工厂委托的表达式参数(在本例中为x)是一个IServiceProvider.

使用它来解决依赖关系:

_serviceCollection.AddSingleton(x =>新服务(x.GetRequiredService(),x.GetRequiredService(),"));

工厂委托是延迟调用.每当要解析类型时，它都会将完成的提供程序作为委托参数传递.

Having the following service constructor

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

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

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

Is there any other way ?

解决方案

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

Use that to resolve the dependencies:

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

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

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