Is there a VB.NET equivalent of C# out parameters?

vb.net c#-to-vb.net out-parameters
cspolton picture cspolton · Dec 5, 2010 · Viewed 73k times · Source

Does VB.NET have a direct equivalent to C# out function parameters, where the variable passed into a function does not need to be initialised?

Answer

Guffa picture Guffa · Dec 5, 2010

No, there is no equivalent of the out keyword in VB.

However, VB does automatically initialise all local variables in a method, so you can use ByRef without needing to explicitly initialise the variable first.

Example:

Sub Main()
  Dim y As Integer
  Test(y)
End Sub

Sub Test(ByRef x As Integer)
  x = 42
End Sub

(If you examine code in the framework (for example Double.TryParse), you may see the <OutAttribute> added to parameters, but that only makes a difference when the call is marshalled for COM interop or platform invoke.)

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