VB.NET null coagulation operator?

Question

Possible duplicates:
Coalesce statement and conditional statement in VB.NET
Is there a VB.NET equivalent for C #? operator?

Is there a built-in VB.NET equivalent for a zero-coalescing C # operator?

Answer 1

Yes, there is, as long as you use VB 9 or later (included with Visual Studio 2008).

You can use the If version of the operator to accept only two arguments:

 Dim myVar? As Integer = Nothing Console.WriteLine(If(myVar, 7)) 

More information can be found here in the blog post by the VB.NET team.

(Yes, this is the operator although it looks like a function. It will be compiled to the same IL as the “correct” operator with zero coalescing in C #.)

Example

 Dim b As Boolean? Console.WriteLine("{0}.", If(b, "this is expected when b is nothing")) 'output: this is expected when b is nothing. b = False Console.WriteLine("{0}.", If(b, "this is unexpected when b is false")) 'output: False. b = True Console.WriteLine("{0}.", If(b, "this is unexpected when b is true")) 'output: True. 

Answer 2

According to this question, it seems that the answer is If ()

Answer 3

No. Use GetValueOrDefault ; why is he there!

Answer 4

I do not believe that there is a built-in equivalent of VB.Net, but here is the answer: the null coalesce operator in VB.Net (8)