Call procedure from string value

having experienced this problem myself I was doing some research the other day, but not to much enlightenment (I'm still using a case condition as my list is not too large). But I think I would be correct to point you in the direction of using delegates combined with addressOf?

Hope you get some answers :)

I can get a simple delegate reference to work. I just can't figure out how to convert the string value to the procedure reference and get it to work.

This works:

Delegate Function Test_Proc(ByVal vStart As Date, ByVal vEnd As Date) As Boolean

Private Sub btnAutoRun_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAutoRun.Click
Delegate_Test(AddressOf DoIt, #12/14/2005#, #1/1/2006#)
End Sub

Public Function DoIt(ByVal vstart As Date, ByVal vend As Date) As Boolean
MessageBox.Show(vstart.ToShortDateString & " To " & vend.ToShortDateString, "Wohoo!")
Return True
End Function

Private Function Delegate_Test(ByVal proc As Test_Proc, ByVal vStart As Date, ByVal vend As Date) As Boolean
Dim fresult As Boolean = False
fresult = proc.Invoke(vStart, vend)
MessageBox.Show(fresult.ToString)
End Function

I just need to be able to pass:

Delegate_Test(AddressOf "DoIt", #12/14/2005#, #1/1/2006#)

and get it to work :D

joewmaki,

You might also consider using VB's CallByName function.

Kerry Moorman

Phil,

Yes, at least VB.Net 2003 supports CallByName.

If it will do what you need it is probably simpler to use than reflection.

Kerry Moorman

joewmaki,

You might also consider using VB's CallByName function.

Kerry Moorman

Thanks Kerry, this looks like the simplest solution.

Interesting, I did not know about CallByName. Thanks!