Code conversion from C# to VB.NET

Question

Hello all i have tried to convert c# code to vb but getting error in this line as "Expression Expected" what can be the error and what is the correct syntax. Error is in second line

Dim m As MenuItem = TryCast(sender, MenuItem)
audioDevice = (If(m.Index>0, filters.AudioInputDevices(m.Index-1), Nothing))

C# CODE

MenuItem m = sender as MenuItem;
audioDevice = ( m.Index>0 ? filters.AudioInputDevices[m.Index-1] : null );

As per MSDN, your code must be working properly on VS2008 and up msdn.microsoft.com/en-us/library/bb513985(v=vs.90).aspx If you do not want to use Iif then your choice... — Jon P
– Jon P, Commented Jan 10, 2014 at 9:42

Jonas Høgh · Accepted Answer · 2014-01-10 16:01:13Z

4

Are you running VB.Net 2008 or later? The If operator is not supported in earlier versions.

Since the non-short-circuit Iif function will cause the true-part of the expression to cause an index out of range, you should use an If Then Else statement if you want a version prior to 2008 to be supported.

edited Jan 10, 2014 at 16:01

answered Jan 10, 2014 at 9:41

Jonas Høgh

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2 Comments

Matt Wilko Over a year ago

Also note that the IF operator is type safe whereas IIF is not.

Chris Dunaway Over a year ago

Just to be pedantic, IIF is not an operator, it is a function. IF in newer versions of VB is an operator.

BenMorel · Accepted Answer · 2014-05-21 22:29:49Z

1

Try this

Dim m As MenuItem = TryCast(sender, MenuItem)
audioDevice = (IIf(m.Index>0, filters.AudioInputDevices(m.Index-1), Nothing))

IIf Function MSDN Documentation

As IIf Function is deprecated use like this

If m.Index>0 Then
    audioDevice = filters.AudioInputDevices(m.Index-1)
  Else
    audioDevice = Nothing
  End If

Sample

Hope it helps

edited May 21, 2014 at 22:29

BenMorel

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answered Jan 10, 2014 at 9:38

Amarnath Balasubramanian

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4 Comments

Jon P Over a year ago

that's what I've said

Amarnath Balasubramanian Over a year ago

@nathan742 Yup you are right in comments, but i too found out that it might be mistake and i was in search of online documentation of it..

PHeiberg Over a year ago

Iif is deprecated in favor of If

Amarnath Balasubramanian Over a year ago

see he was asking where the error may be, i pointed out that.

Battery1 · Accepted Answer · 2014-01-29 06:48:34Z

-1

Here is probably the best tool I have ever found! And having been a developer for over 10 years, when I found this (And with most examples online being in C, this was just GOLDEN!) .. Hope this helps you! (And anyone else that hasn't stumbled across this 'gem'... Finally VB coders have better access to online examples... NOTE* this isn't the only code converter, but it's by far the best one I have ever used.. Perhaps if you convert the code again using this, your troubles might be solved.......

http://converter.telerik.com/ (Does an amazing job on converting)

answered Jan 29, 2014 at 6:48

Battery1

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