Missing Class

Imports System.Reflection

Public Class MissingSample

    Public Shared Function MyMethod(Optional k As Integer = 33) As String
        Return "k = " & k.ToString()
    End Function

End Class


Public Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      ' To invoke MyMethod with the default argument value, pass 
      ' Missing.Value for the optional parameter. First, get the 
      ' method.
      Dim mi As MethodInfo = GetType(MissingSample).GetMethod("MyMethod")

      ' Second, create an array of parameters to pass to the method.
      ' In this case, the array contains just one element.
      Dim arguments() As Object = { Missing.Value }

      ' Finally, invoke the method. Specify Nothing for the target
      ' object, because the method is Shared.
      Dim result As Object = mi.Invoke(Nothing, arguments)

      outputBlock.Text &= String.Format("MyMethod returned '{0}'" & vbLf, result)

   End Sub

End Class

' This code example produces the following output:
'
'MyMethod returned 'k = 33'

using System;
using System.Reflection;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      // To invoke MyMethod with the default argument value, pass 
      // Missing.Value for the optional parameter. First, get the 
      // method.
      MethodInfo mi = 
         typeof(SilverlightLibrary.MissingSample).GetMethod("MyMethod");

      // Second, create an array of parameters and invoke the method.
      // In this case, the array contains just one element.
      object result = mi.Invoke(null, new Object[] { Missing.Value });

      outputBlock.Text += String.Format("MyMethod returned '{0}'\n", result);
   }
}

/* This code example produces the following output:

MyMethod returned 'k = 33'
 */