c# - 如何在 C# 中扩展返回泛型值的泛型类？

Question

我在使用简单的 Clone 方法扩展通用 Stack 类时遇到了问题。这是我的方法:

class Program
{
    static void Main(string[] args)
    {
        Stack<string> myStack = new Stack<string>();
        myStack.Push("hello!");

        var stackClone = myStack.Clone();

    }
}

public static class StackMixin<T>
{
    public static Stack<T> Clone<T>(this Stack<T> stackToClone)
    {
        if (stackToClone == null)
            throw new ArgumentNullException();

        IEnumerable<T> reversedStackToClone = stackToClone.Reverse<T>();
        Stack<T> cloneStack = new Stack<T>(reversedStackToClone);
        return cloneStack;
    }
}

我收到以下错误:

System.Collections.Generic.Stack<string> does not contain a definition for 'Clone' and no extension method 'Clone' accepting a first argument of type System.Collections.Generic.Stack<string> could be found (are you missing a using directive or an assembly reference?)

我一直在谷歌上搜索解决方案或解释，但没有成功。 (这就是我所拥有的:试过 https://www.google.pl/#q=generic+extension+method+c%23 )

Answer 1

根据评论:更改 public static class StackMixin<T>至 public static class StackMixin