Answer 1

Answer 2

Answer 3

Answer 4

除了接口之外，我还需要对此进行扩展以包含类型继承。这就是我想出的：

interface IFace<T> {}
class Impl<T> : IFace<T> {}
class Derived<T> : Impl<T> {}

public static bool InheritsFrom(this Type tDerived, Type tBase)
{
    if (tDerived.IsSubtypeOf(tBase)) return true;
    var interfaces = tDerived.GetInterfaces()
                             .Select(i => i.IsGenericType ? i.GetGenericTypeDefinition() : i);
    return interfaces.Contains(tBase);
}
public static bool IsSubtypeOf(this Type tDerived, Type tBase)
{
    var currentType = tDerived.BaseType;
    while (currentType != null)
    {
        if (currentType.IsGenericType)
            currentType = currentType.GetGenericTypeDefinition();
        if (currentType == tBase) return true;
        currentType = currentType.BaseType;
    }
    return false;
}

请注意，虽然这些方法适用于任何两种类型，但它们假设如果传递泛型类型，则类型是开放的（即，它是没有定义类型参数的泛型类型定义）。