依赖注入，注入参数 [英] Dependency injection, inject with parameters

问题描述

我正在使用DI的vNext实现. 如何将参数传递给构造函数? 例如，我上课:

I'm using vNext implementation of DI. How to pass parameters to constructor? For example, i have class:

public class RedisCacheProvider : ICacheProvider
{
    private readonly string _connectionString;

    public RedisCacheProvider(string connectionString)
    {
        _connectionString = connectionString;
    }
    //interface methods implementation...
}

服务注册:

services.AddSingleton<ICacheProvider, RedisCacheProvider>();

如何将参数传递给RedisCacheProvider类的构造函数? 例如Autofac:

How to pass parameter to constructor of RedisCacheProvider class? For example for Autofac:

builder.RegisterType<RedisCacheProvider>()
       .As<ICacheProvider>()
       .WithParameter("connectionString", "myPrettyLocalhost:6379");

推荐答案

您可以提供一个委托来手动实例化您的缓存提供程序，也可以直接提供一个实例:

You can either provide a delegate to manually instantiate your cache provider or directly provide an instance:

services.AddSingleton<ICacheProvider>(provider => new RedisCacheProvider("myPrettyLocalhost:6379"));

services.AddSingleton<ICacheProvider>(new RedisCacheProvider("myPrettyLocalhost:6379"));

请注意，即使容器实现IDisposable，该容器也不会显式处理手动实例化的类型.请参阅有关服务的处理以获取更多信息.

Please note that the container will not explicitly dispose of manually instantiated types, even if they implement IDisposable. See the ASP.NET Core doc about Disposal of Services for more info.

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