static void Main(string[] args)        {            TestTypeOf
     
      ();            Console.ReadKey();        }        static void TestTypeOf
      
       ()        {            Console.WriteLine(typeof(List
       
        ).IsGenericType);//True            Console.WriteLine(typeof(List
        
         ).IsGenericTypeDefinition);//False            Console.WriteLine(typeof(List<>).IsGenericTypeDefinition);//True            Console.WriteLine("************************************************");            //根据一个已构造的类型,获取它的泛型类型定义            Console.WriteLine((typeof(List
         
          ).GetGenericTypeDefinition()));//System.Collection.Generic.List`1[T]            //Console.WriteLine((typeof(T).GetGenericTypeDefinition()));//会抛出异常,因为 typeof(T) 不是一个泛型类型            //根据一个定义的泛型类型,返回一个已构造的类型            Console.WriteLine((typeof(List<>).MakeGenericType(typeof(T))));//System.Collection.Generic.List`1[System.String]            Console.WriteLine("************************************************");            Console.WriteLine(typeof(T));//System.String            Console.WriteLine(typeof(List<>));//等价于        typeof(List
          
           ).GetGenericTypeDefinition() Console.WriteLine(typeof(Dictionary<,>));//System.Collection.Generic.Dictionary`2[TKey,TValue] Console.WriteLine(typeof(List
           
            ));//等价于 typeof(List<>).MakeGenericType(typeof(T)) Console.WriteLine(typeof(Dictionary
            
             ));//System.Collection.Generic.Dictionary`2[System.String,System.String] Console.WriteLine(typeof(List
             
              ));//System.Collection.Generic.List`1[System.Int64] Console.WriteLine(typeof(Dictionary
              
               ));//System.Collection.Generic.Dictionary`2[System.Int64,System.Guid] }