Csharp/CSharp Tutorial/Reflection/Generic Type

Reflection with Generics

<source lang="csharp">using System; using System.Reflection; public class Program {

 static void Main()
 {
     Type type;
     type = typeof(System.Nullable<>);
     Console.WriteLine(type.ContainsGenericParameters);
     Console.WriteLine(type.IsGenericType);
     type = typeof(System.Nullable<DateTime>);
     Console.WriteLine(!type.ContainsGenericParameters);
     Console.WriteLine(type.IsGenericType);
 }

}</source>

Type: MakeGenericType

<source lang="csharp">using System; using System.Collections.Generic; public class MainClass {

   static void Main() {
       IList<int> intList = (IList<int>) CreateClosedType<int>( typeof(List<>) );
       IList<double> doubleList = (IList<double>) CreateClosedType<double>( typeof(List<>) );
       Console.WriteLine( intList );
       Console.WriteLine( doubleList );
   }
   static object CreateClosedType<T>( Type genericType ) {
       Type[] typeArguments = {
           typeof( T )
       };
       Type closedType = genericType.MakeGenericType( typeArguments );
       return Activator.CreateInstance( closedType );
   }

}</source>

System.Collections.Generic.List`1[System.Int32]
System.Collections.Generic.List`1[System.Double]

Using Reflection with Generic Types

<source lang="csharp">using System; using System.Collections.Generic; public class Program {

 public static void Main()
 {
     Stack<int> s = new Stack<int>();
     Type t = s.GetType();
     foreach(Type types in t.GetGenericArguments())
     {
         System.Console.WriteLine(
             "Type parameter: " + types.FullName);
     }
     // ...
 }

}</source>