Type.IsGenericTypeDefinition和Type.ContainsGenericParameters之间的区别 [英] Difference between Type.IsGenericTypeDefinition and Type.ContainsGenericParameters

问题描述

System.Type 类型包含属性 IsGenericTypeDefinition 和 ContainsGenericParameters 。阅读完MSDN文档后，我得出结论：这两个属性都存在以检查某个类型是开放还是封闭的泛型类型。

然而，我看不出有什么区别在这两者之间，以及当你想使用另一个时。 Type.ContainsGenericParameters / code>是递归的：

  var genericList = typeof（List<>） ; 
 var listOfSomeUnknownTypeOfList = genericList.MakeGenericType（genericList）; 
 listOfSomeUnknownTypeOfList.IsGenericTypeDefinition; // => false 
 listOfSomeUnknownTypeOfList.ContainsGenericParameters; // => true 
  

这里发生的是 listOfSomeUnknownTypeOfList 是不是泛型类型定义本身，因为它的类型参数对于某些T而言是已知的 List< T> 。但是，由于 listOfSomeUnknownTypeOfList 不是完全已知的（因为它的类型参数是一个类型定义） ContainsGenericParameters 是 true 。

The System.Type type contains the properties IsGenericTypeDefinition and ContainsGenericParameters. After reading the MSDN documentation I conclude that both properties exist to to check whether a type is an open or closed generic type.

However, I fail to see what the difference is between the two, and when you want to use one over the other.

解决方案

Type.ContainsGenericParameters is recursive:

var genericList = typeof(List<>);
var listOfSomeUnknownTypeOfList = genericList.MakeGenericType(genericList);
listOfSomeUnknownTypeOfList.IsGenericTypeDefinition;  // => false
listOfSomeUnknownTypeOfList.ContainsGenericParameters; // => true

What happens here is that listOfSomeUnknownTypeOfList is not a generic type definition itself because its type parameter is known to be a List<T> for some T. However, since the type of listOfSomeUnknownTypeOfList is not exactly known (because its type argument is a type definition) ContainsGenericParameters is true.

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