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Wednesday, July 27, 2005

Execute a function using it's name as string

A collegue asked me if it was possible to call a function when you only have a string with the name of the function.
Of course, this is possible in .NET, everything is ;-)

This is the little test-project I created for him in VB.NET.
  • Add two buttons to a form
  • Add these two function in code:

Private Function test1() As String
Return Now.ToString("dd/MM/yyyy HH:mm:ss")
End Function

Private Function test2(ByVal string1 As String, ByVal integer1 As Integer) As String
Return Convert.ToString(integer1) & string1
End Function

  • Add this main function:

Private Function CallFunctionByName(ByVal name As String, ByVal parameters As Object()) As Object
Return Me.GetType.GetMethod(name, BindingFlags.NonPublic Or BindingFlags.Public Or BindingFlags.Static Or BindingFlags.Instance).Invoke(Me, parameters)
End Function

  • Add the click-events of the two buttons:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Button1.Text = Convert.ToString(CallFunctionByName("test1", Nothing))
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim p As Object() = New Object(1) {}
p(0) = "test"
p(1) = 14
Button2.Text = Convert.ToString(CallFunctionByName("test2", p))
End Sub

Pretty easy, isn' t it?


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Stefanie Worm is het liefste vrouwtje van de wereld.
Melina is de liefste schatsie van de wereld (Erik De Maeyer).