Linq C# to Vb .Net

Question

Im struggling trying to convert this code. As well as googling for an answer and reading MSDN documentation i still cant figure this out. Ive also looked at the examples

101 for Visual Basic .Net 101 for C# .Net

Hers some C# code im trying to convert:

var asciiCredentials = (from c in credentials
                select c <= 0x7f ? (byte)c : (byte)'?').ToArray();

My attempt so far:

Dim ascii = (From c In Credentials(Function(x) x= 0x7f .....)

But cant figure it out!! I think the Byte conversion is putting me off track.

Can anyone advise

I've been using C# recently but need to make that transition soon hopefully. It depends on the other guys too as i cant have my projects with C# and rest with VB .Net ;-) — Computer
– Computer, Commented Dec 18, 2013 at 20:54
Hmm wonder why someone decided to remove the 1 up vote i had for putting in research etc — Computer
– Computer, Commented Dec 18, 2013 at 21:11

RomSteady · Accepted Answer · 2013-12-18 23:37:45Z

3

Remember that Visual Basic has the IIf command that, in some respects, acts like the ternary operator.

    Dim ascii = (From ch In s
                Select IIf(Char.GetNumericValue(ch) < 127, Convert.ToByte(ch), Convert.ToByte("?"c))).ToArray()

There was a comment saying this didn't compile

edited Dec 18, 2013 at 23:37

answered Dec 18, 2013 at 20:58

RomSteady

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5 Comments

RomSteady Over a year ago

To create this LINQ query, I loaded VS2013, assigned a value to the string "s", compiled it, and debugged it to validate the results. Which version of Visual Studio/Visual Basic are you targeting? (Image attached to show it in the debugger.)

Dave Doknjas Over a year ago

Sorry - I was testing with an 's' similar to what the op used (List<int> probably).

RomSteady Over a year ago

Not a problem. I should have posted my entire code block, not just the snippet.

Rustam Over a year ago

IIf is not a best solution, since it evaluates both arguments, better use If() instead

RomSteady Over a year ago

Rustram, very true. I haven't used VB.NET since 2006, so until this thread I wasn't aware that the short-circuit ternary operator was added in .NET 3.0 to VB.NET.

Servy · Accepted Answer · 2013-12-18 23:03:51Z

1

You can use If in place of the conditional operator, making the code:

Dim asciiCredentials = credentials.Select(Function(x) _
        If(x <= 127, Convert.ToByte(c), Convert.ToByte("?"C)))_
    .ToArray();

edited Dec 18, 2013 at 23:03

answered Dec 18, 2013 at 20:53

Servy

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3 Comments

crthompson Over a year ago

Boy, it was funny that as soon as you post, the other answers changed to use your IF.

BlackICE Over a year ago

mine had it from start, just missing the space when I copied for some reason

Dave Doknjas Over a year ago

This doesn't compile.

Dave Doknjas · Accepted Answer · 2013-12-18 22:18:28Z

0

Dim asciiCredentials = (
    From c In credentials
    Select If(c <= &H7f, CByte(c), AscW("?"c))).ToArray()

answered Dec 18, 2013 at 22:18

Dave Doknjas

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Comments

BlackICE · Accepted Answer · 2013-12-19 13:36:25Z

0

Dim asciiCredentials = (From c In credentials Select If(c <= &H7f, CByte(c), CByte(AscW("?"C)))).ToArray()

Taken from here:http://www.developerfusion.com/tools/convert/csharp-to-vb

They usually do pretty well converting.

edited Dec 19, 2013 at 13:36

answered Dec 18, 2013 at 20:52

BlackICE

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2 Comments

Dave Doknjas Over a year ago

This doesn't compile.

BlackICE Over a year ago

You're correct, it was missing the select. I've put that in to make the answer correct, and I'm contacting the conversion site. Thanks for the info.

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