What is the “ := ” operator in (VB).NET or what is it good for?

I see this from time to time and want to know what it is. I did try google, but its filtering out the characters from the search. I have a few books that don't reference it either.

FWIW, I remember in pascal that is was the assignment operator.

Can anybody point me to the MSDN or similar page?

Answers


You can use the := syntax to assign the parameters to a Sub or Function by name, rather than strictly by position. For example:

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TestRoutine(Y:="TestString", X:=12)
    End Sub

    Private Sub TestRoutine(ByVal X As Long, Optional Y As String = "")
        ' Do something with X and Y here... '
    End Sub

End Class

Note that TestRoutine specifies X as the first parameter, and Y as the second, but the call in Form1_Load has them in the opposite order, naming each parameter with the := operator.

Here's a link to an MSDN article on the subject:

http://msdn.microsoft.com/en-us/library/51wfzyw0.aspx

I don't see this used very often, except in VBA macros generated by Excel's macro recorder, which uses it a lot.


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