如何在Unity中向不同的构造函数两次注册同一类型? [英] How to register same type twice with different constructors in Unity?

问题描述

我正在尝试注册相同的类型，但使用两个不同的构造函数.当我尝试解析时，在第二个解析中得到"依赖项解析失败".

I'm trying to register the same type but with two different constructors. When I trying to resolve, I get "Resolution of the dependency failed" on the second Resolve.

    var container = new UnityContainer();

    container.RegisterType<IBar, Bar>()
        .RegisterInstance(new Bar())
        .RegisterType<IBar, Bar>()
        .RegisterInstance(new Bar("foo"));

    Bar bar1 = (Bar)container.Resolve<IBar>();
    Bar bar2 = (Bar)container.Resolve<IBar>("foo");  // ERROR

我做错了什么?

推荐答案

注册时需要给他们起名字. Resolve的参数是所需实例的名称.

You need to give them names when registering. The parameter to Resolve is the name of the instance you want.

var container = new UnityContainer();

container
    .RegisterInstance<IBar>("BAR", new Bar())
    .RegisterInstance<IBar>("FOOBAR", new Bar("foo"));

Bar bar1 = (Bar)container.Resolve<IBar>("BAR");
Bar bar2 = (Bar)container.Resolve<IBar>("FOOBAR");

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