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Last post Sep 28, 2011 03:31 PM by David Anton

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kmcnet

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C# to VB.Net

Sep 23, 2011 11:35 PM|LINK

Hello Everyone and thanks for your help in advance. I am rewriting some C#code to Vb.Net and have used some of the conversion sites. However, one line of code does not appear to be converting correctly and I don't understand it enough to rewrite it. The line is:

public event RenderEvent BeforeRender = (writer, document) => { };

Any help would be greatly appreciated.
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Careed

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Re: C# to VB.Net

Sep 24, 2011 01:56 AM|LINK
Try this:
```
Public Event RenderEvent BeforeRender = Function(writer, document) <whatever would be in between your braces in C# without the angle brackets>
```
Christopher Reed, MCT, MCPD, MCTS, Microsoft Specialist, MTA
"The oxen are slow, but the earth is patient."
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kmcnet

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Re: C# to VB.Net

Sep 24, 2011 03:02 AM|LINK

Thanks for the response. Part of the problem is I don't understand what is supposed to be in between the angle brackets.
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Horizon_Net

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Re: C# to VB.Net

Sep 24, 2011 11:52 AM|LINK

Hi,

for further conversions just use the code converter from Telerik - http://converter.telerik.com/

Regards.

If my post solves your problem, please mark as answer.
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Careed

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3649 Posts
Re: C# to VB.Net

Sep 24, 2011 02:50 PM|LINK
You are using a lambda expression which represents an anonymous method. For example, the following is a lambda expression in C#:
```
x => x * x
```
The above can be used to pass in any numeric value to produce its square.

The equivalent expression in VB is:
```
Function(x) x*x
```
To learn more about lambda expressions, try these:

For C#: http://msdn.microsoft.com/en-us/library/bb397687.aspx

For VB: http://msdn.microsoft.com/en-us/library/bb531253.aspx
Christopher Reed, MCT, MCPD, MCTS, Microsoft Specialist, MTA
"The oxen are slow, but the earth is patient."
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kmcnet

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Re: C# to VB.Net

Sep 25, 2011 12:32 PM|LINK

Thanks again for the response. So if I understand correctly the code I am trying to convert => {} simply means perform the function. Is that correct? So when I use the code

Public Event BeforeRender As RenderEvent = Function(writer, document)

End Function

Intellisense tells me and end of statement is expected and that End Function must be preceded by a Function. What am I missing?
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rossmc1

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152 Posts

Re: C# to VB.Net

Sep 26, 2011 04:47 PM|LINK

try this code convertor

http://www.developerfusion.com/tools/

its very powerful for that kind of thing

java generics wildcards
- Edited by rossmc1 on Sep 26, 2011 04:51 PM
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atconway

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Re: C# to VB.Net

Sep 27, 2011 08:05 PM|LINK

Please take note, code converters albeit great are really weak on converting C# lambdas and Anonymous functions to VB.NET (or the inverse). For these types of conversions you are going to need some in-depth understanding of these topics. To add on to the explinations previously given in this thread, you may want to read up on the following, because understanding Lambdas and Anonymous functions is not like needing to understand simple syntax type conversions you normally run across.

Tools for Converting C# code to VB.NET (or vice versa) and a little => ... Function(), Lambdas too:

http://allen-conway-dotnet.blogspot.com/2009/11/tools-for-converting-c-code-to-vbnet-or.html

Lambda Expressions (Visual Basic)

http://msdn.microsoft.com/en-us/library/bb531253.aspx

Thank you, >[Blog]<
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David Anton

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638 Posts
Re: C# to VB.Net

Sep 28, 2011 03:31 PM|LINK
Unfortunately, even in VS 2010 VB does not allow you to initialize events in their declaration, using lambdas or not.

Here's a work-around for you:
```
Class test
	Public Event BeforeRender As RenderEvent

	Sub New()
		AddHandler BeforeRender, Sub(writer, document)
				End Sub
	End Sub
End Class
```
David Anton
http://www.tangiblesoftwaresolutions.com
Instant C# - VB to C# Converter
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- Edited by David Anton on Sep 28, 2011 03:37 PM
- Edited by David Anton on Sep 28, 2011 05:24 PM
- Edited by David Anton on Sep 28, 2011 07:00 PM
- Marked as answer by Qi Wu - MSFT on Sep 30, 2011 03:08 AM