16.3 Retrieving methods from a type

You can retrieve a single MethodInfo object, if you already know the name of the method, or an array of MethodInfo objects.

In the following example, MyClass contains a method called DoThis() which takes in no parameters. Some useful methods of MethodInfo are demonstrated.

 1: using System;  2: using System.Reflection;  3:  4: public class MyClass{  5:   public static void DoThis(){  6:     Console.WriteLine("doing this");  7:   }  8:   public static void DoThat(){  9:     Console.WriteLine("doing that"); 10:   } 11: } 12: 13: public class TestClass{ 14:   public static void Main(){ 15: 16:     Type t = Type.GetType("MyClass"); 17:  MethodInfo m  =  t.GetMethod("DoThis");  18:     Console.WriteLine("method       :" + m); 19:     Console.WriteLine("Name         :" + m.Name); 20:     Console.WriteLine("IsPublic     :" + m.IsPublic); 21:     Console.WriteLine("IsStatic     :" + m.IsStatic); 22:     Console.WriteLine("IsConstructor:" + m.IsConstructor); 23:     Console.WriteLine("ReturnType   :" + m.ReturnType); 24:   } 25: }

Output:

 c:\expt>test method       :Void DoThis() Name         :DoThis IsPublic     :True IsStatic     :True IsConstructor:False ReturnType   :System.Void

If you don't know the method name in the type, you can obtain an array of all MethodInfo objects in a particular type:

 1: using System;  2: using System.Reflection;  3:  4: public class MyClass{  5:   public static void DoThis(){  6:     Console.WriteLine("doing this");  7:   }  8:   public void DoThat(int a, int b){  9:     Console.WriteLine("doing that " + (a*b)); 10:   } 11: } 12: 13: public class TestClass{ 14:   public static void Main(){ 15: 16:     Type t = Type.GetType("MyClass"); 17:  MethodInfo[] methods  =  t.GetMethods();  18: 19:     foreach (MethodInfo m in methods) 20:       Console.WriteLine("method: " + m); 21:   } 22: }

Output:

 c:\expt>test method: Int32 GetHashCode() method: Boolean Equals(System.Object) method: System.String ToString() method: Void DoThis() method: Void DoThat(Int32, Int32) method: System.Type GetType()

Notice that several methods such as GetHashCode , Equals , and ToString inherited from System.Object to MyClass are also retrieved.