隐式运算符访问其他类型的属性

我可能错过了一些显而易见的东西,但我无法让它发挥作用:

class V { 
    public int X;
    public V() => X=0;
}

class C<T> {
    public T t;
    public C(T t) => this.t=t;
    public static implicit operator T(C<T> o) => o.t;
}

public class Program
{
    public static void Main()
    {
        V v = new();
        C<V> c = new(v);

        // this works OK
        Console.WriteLine( ((V)c).X );

        // but this which I want fails why ?
        Console.WriteLine( c.X );
    }
}

我得到:

“C”不包含“X”的定义,并且找不到接受类型为“C”的第一个参数的可访问扩展方法“X”