如何从一个泛型参数继承？ [英] How to inherit from a generic parameter?

问题描述

我基本上想做到这一点：

I'm basically wanting to do this:

class UILockable<T> : T
    where T : UIWidget
{
}

不过，这是行不通的。我见过的人建议你这样做：

However, this doesn't work. I've seen people recommend that you do this:

class UILockable<T>
    where T : UIWidget
{
    private T _base;
}

这需要我重写每个功能UILockable需要，并将其转发给T这是不可能的，因为T可从UIWidget派生，并有自己的独特的抽象/虚方法。

This would require me to override each function UILockable would need and forward it to T. This is impossible since T may derive from UIWidget and have unique abstract/virtual methods of its own.

有没有办法简单地在T继承？

Is there no way to simply inherit from T?

推荐答案

您不能从泛型类型参数继承。 C＃泛型是从C ++模板非常不同。从类型参数继承需要类基于类型的参数，这是不符合.NET泛型会发生什么有完全不同的表现。他们是在IL和母语水平（所有引用类型参数）相同。

You can't inherit from the generic type parameter. C# generics are very different from C++ templates. Inheriting from the type parameter requires the class to have a completely different representation based on the type parameter, which is not what happens with .NET generics. They are identical at the IL and native level (for all reference type arguments).

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