c# - Is it possible to design a C# class that when querying it through reflections will mark itself as positive IsValueType and positive IsClass?

Question

Is it possible to design a C# class that when querying it through reflections will mark itself as positive IsValueType and positive IsClass?

Or are they actually mutually exclusive markings?

I know that,

Most primitive types will return (including enums & structs):
IsValueType=true, IsClass=false.

String or any class - abstracts too.. return:
IsValueType=false, IsClass=true.

Interfaces returns:
IsValueType=false, IsClass=false

Answer 1

是否可以设计一个 C# 类，当通过反射查询它时会将其自身标记为正 IsValueType 和正 IsClass？

让我们看一下这些实现：

protected virtual bool IsValueTypeImpl()
{
      return this.IsSubclassOf((Type) RuntimeType.ValueType);
}

public bool IsClass
{
  [__DynamicallyInvokable] get
  {
    if ((this.GetAttributeFlagsImpl() & TypeAttributes.ClassSemanticsMask) == TypeAttributes.NotPublic)
      return !this.IsValueType;
    else
      return false;
  }
}

如您所见，IsValueTypeImpl()（由IsValueType属性调用）依赖于继承并且IsClass 依赖于 IsValueType（！）。

接下来，这个 ValueType 的描述表明不能直接从 ValueType 继承。

所以，答案是否定的，你不能同时创建IsClass类型IsValueType