传递多个通用接口的方法 [英] Passing multiple generic interfaces to a method

问题描述

我试图传递多个通用接口作为参数传递给我的一个类的构造函数。

I am trying to pass multiple generic interfaces as parameters to the constructor of one of my classes.

下面的代码无法编译：

public interface IPosterGenerator<T>
{
    IQueryable<T> GetPosters();
}

public class Pinboard
{
    public Pinboard(IPosterGenerator<A> firstPosterGenerator, IPosterGenerator<B> secondPosterGenerator, IPosterGenerator<B> thirdPosterGenerator)
    { 
    }
}

我有一百个不同类型的海报发电机。他们都从IPosterGenerator接口继承。当我实例化一个新的插件板，我需要三IPosterGenerators传递给插件板的构造。然而，每一个这三个IPosterGenerators将是不同类型的。这就是为什么我来到了这个傻A，B和C。

I have about a hundred different types of poster generators. They all inherit from the IPosterGenerator interface. When I instantiate a new Pinboard, I need to pass three IPosterGenerators to the pinboard's constructor. However, every of these three IPosterGenerators will be of a different type. That's why I came up with this silly A, B and C.

可以这样可言呢？

推荐答案

这听起来像你可能想使插件板通用：

It sounds like you probably want to make Pinboard generic:

public class Pinboard<T1, T2, T3>
{
    public Pinboard(IPosterGenerator<T1> generator1,
                    IPosterGenerator<T2> generator2,
                    IPosterGenerator<T3> generator3)
    {
         ...
    }
}

要使它更容易调用，您可以的也的创建一个非泛型类与泛型方法：

To make it easier to call, you can also create a non-generic class with a generic method:

public static class Pinboard
{
    public static Pinboard<T1, T2, T3> Create(IPosterGenerator<T1> generator1,
                                              IPosterGenerator<T2> generator2,
                                              IPosterGenerator<T3> generator3)
    {
        return new Pinboard<T1, T2, T3>(generator1, generator2, generator3);
    }
}

然后，如果你已经有了发电机，你可以叫：

Then if you've already got the generators, you can just call:

// Or whatever...
var board = Pinboard.Create(bigGenerator, smallGenerator, mediumGenerator);

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