其中t：多个类 [英] where t : multiple classes

问题描述

List<T> Foo<T>(Ilist list) 
where T : ??

有没有办法强制执行T可将结果
几节课之一吗？

is there any way to enforce T to be
one of few classes ?

我最终想要做对T开关。

eventually i want to do a switch on T..

感谢。

推荐答案

在这种方式强制类型约束指出，那些几类与通用功能有关。

Enforcing a type constraint in this way indicates that those several classes are related with common functionality.

你应该实现一个共同的接口，然后限制类型的接口：

You should implement a common Interface and then restrict the type to that Interface:

public interface IUseful
{
    public void UsefulMethod();
}

List<T> Foo<T>(IList list) where T : IUseful
{
    // You now have access to all common functionality defined in IUseful
}

额外的好处是，现在你不必打开 T 实施不同的行为。你可以有 IUseful 的孩子实现自己的行为，然后调用每一个自己。

The added benefit is that now you don't have to switch on T to implement different behaviors. You can have the children of IUseful implement their own behaviors and then call each on their own.

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