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Converting C# to VB.NET

Posted on 2009-06-28
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Last Modified: 2013-12-17
I've tried to convert the following code to VB.NET

but have failed and the converters I've tried don't seem to convert the code correctly:

objReader = (enc != null) ? new StreamReader(filestream, enc) : new StreamReader(filestream);

Any help would be great.
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Question by:directxBOB
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guru_sami earned 350 total points
ID: 24732763
not sure of using Conditional Operator in VB but here is VB code for what the above C# code is trying to accomplish:

If enc IsNot Nothing Then
    objReader = New StreamReader(filestream, enc)
Else
    objReader = New StreamReader(filestream)
End If
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LVL 41

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by:guru_sami
guru_sami earned 350 total points
ID: 24732774
Alrite I think IIF(i-i-f) works like conditional operator in VB.NET:

Try like this:
objReader = IIf((enc IsNot Nothing), New StreamReader(filestream, enc), New StreamReader(filestream))

Ref:
http://www.dotnetspider.com/forum/1324-exmple-for-coinditional-operator-vb-net.aspx
http://www.willasrari.com/blog/vbnet-conditional-operators-or-lack-thereof/000296.aspx
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LVL 86

Assisted Solution

by:Mike Tomlinson
Mike Tomlinson earned 150 total points
ID: 24732956
*** BE CAREFUL ***

IIf() has severe limitations...

See: http://msdn.microsoft.com/en-us/library/27ydhh0d.aspx

    "Because the IIf function does NOT use short-circuit evaluation, it always evaluates all three of its arguments."
                                                    ^^^^
In your case, if "enc" IS actually Nothing, then Nothing would be passed to the StreamReader() Constructor since ALL THREE arguments are evaluated regardless of the result of the conditional portion.  This will probably result in an exception being thrown.

.Net 3.5 has an equivalent If() operator:
http://msdn.microsoft.com/en-us/library/bb513985.aspx

If you don't have that version then you need the longer code in guru_sami's first post.
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Author Closing Comment

by:directxBOB
ID: 31597744
Kept it simple
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