.NET Core IServiceScopeFactory.CreateScope（）与IServiceProvider.CreateScope（）扩展

问题描述

我的理解是，使用内置的依赖项注入时，.NET Core控制台应用程序将需要您自己创建和管理所有范围，而ASP.NET Core应用程序将创建和管理默认情况下，通过定义的中间件实现HttpRequest 范围。

My understanding is that when using the built in the dependency injection, a .NET Core console app will require you to create and manage all scopes yourself whereas a ASP.NET Core app will create and manage the HttpRequest scope by default through defined middleware(s).

使用ASP.NET Core，您可以选择通过调用 CreateScope（）创建和管理自己的范围当您需要位于 HttpRequest 之外的服务时。

With ASP.NET Core, you can optionally create and manage your own scopes that by calling CreateScope() for when you need services that live outside of a HttpRequest.

很明显，调用 IServiceScopeFactory.CreateScope（）每次都会创建一个新的 IServiceScope ；但是，是否每次都调用 IServiceProvider.CreateScope（）扩展方法还会创建一个新的 IServiceScope 吗？

It is clear that calling IServiceScopeFactory.CreateScope() will create a new IServiceScope every time; however, does calling the IServiceProvider.CreateScope() extension method also create a new IServiceScope every time?

基本上，以下两种在ASP.NET Core和.NET Core控制台应用程序中创建作用域的方法之间存在有意义的区别：

Basically, is there a meaningful difference between the following ways to create scope in both ASP.NET Core and .NET Core console apps:

public class Foo()
{
    public Foo(IServiceProvider serviceProvider)
    {
        using(var scope = serviceProvider.CreateScope())
        {   
            scope.ServiceProvider.GetServices<>();           
        }
    }
}

和

public class Bar()
{
    public Bar(IServiceScopeFactory scopeFactory)
    {
        using(var scope = scopeFactory.CreateScope())
        {   
            scope.ServiceProvider.GetServices<>();           
        }
    }
}

推荐答案

解决 IServiceScopeFactory 并对其调用 CreateScope（）：

public static IServiceScope CreateScope(this IServiceProvider provider)
{
    return provider.GetRequiredService<IServiceScopeFactory>().CreateScope();
}

所以，就像@Evk

IServiceProvider 刚刚包装的调用 CreateScope（）从 IServiceScopeFactory

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