我学了.NET的反思和我有一个很难搞清楚的差异。

I'm Studying up on .net reflection and am having a hard time figuring out the difference.

据我了解，名单，其中，T＆GT; 是一个泛型类型定义。这是否意味着，到.NET反射T是泛型类型？

From what I understand, List<T> is a generic type definition. Does that mean that to .net reflection T is the generic type?

具体而言，我想我在寻找的Type.IsGenericType和Type.IsGenericTypeDefinition功能更多的背景。

Specifically, I guess I'm looking for more background on the Type.IsGenericType and Type.IsGenericTypeDefinition functions.

谢谢！

推荐答案

在您的例子名单，其中，T＆GT; 是一个泛型类型定义。 T 被称为泛型类型参数。当类型参数中指定像名单，其中，串＆GT; 或名单，其中，INT＆GT; 或名单＆LT;双＆GT; 那么你有一个泛型类型。可以看到，通过运行一些code这样的...

In your example List<T> is a generic type definition. T is called a generic type parameter. When the type parameter is specified like in List<string> or List<int> or List<double> then you have a generic type. You can see that by running some code like this...

public static void Main()
{
    var l = new List<string>();
    PrintTypeInformation(l.GetType());
    PrintTypeInformation(l.GetType().GetGenericTypeDefinition());
}

public static void PrintTypeInformation(Type t)
{
    Console.WriteLine(t);
    Console.WriteLine(t.IsGenericType);
    Console.WriteLine(t.IsGenericTypeDefinition);    
}

这将打印

System.Collections.Generic.List`1[System.String] //The Generic Type.
True //This is a generic type.
False //But it isn't a generic type definition because the type parameter is specified
System.Collections.Generic.List`1[T] //The Generic Type definition.
True //This is a generic type too.                               
True //And it's also a generic type definition.

另一种方式来获得泛型类型定义直接为的typeof（名单＆LT;＆GT;）或 typeof运算（字典＆LT;，＆GT;）。