Trying to assign return type as void

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.net
c#

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+1 Q:

Trying to assign return type as void

Func<int, void> or Func<int, typeof(void)> seems to be not working.

Is it any way to solve this problem without delcaring custom delegates?

+10 A:

void is not a data type in C#. You could use:

Action<int>

which is a delegate type for a method with a single int parameter and no return value.

Philippe Leybaert 2009-09-25 10:27:00

Great! Thank you very much!

Overdose 2009-09-25 10:30:55

C# void is an alias for the .NET Framework System.Void type.System.Void is a structure that specifies a return value type for a method that does not return a value.

Viktor Jevdokimov 2009-09-25 10:39:18

System.Void is only useful if you're using reflection. It's not a real type, rather a placeholder to indicate "no return type"

Philippe Leybaert 2009-09-25 12:08:45

Is it really not a real type? I know for sure `void` is a real type in the Common Type System, but it might not be the same as `System.Void`.

Joren 2009-09-25 12:18:54

It depends what you call a real type. It would be interesting to see if you could define a variable of type void in the CLR. I doubt it though.

Philippe Leybaert 2009-09-25 13:14:34

You cannot. Void is only usable as a return type. See my recent article on this for more details: http://blogs.msdn.com/ericlippert/archive/2009/06/29/the-void-is-invariant.aspx

Eric Lippert 2009-09-25 14:26:33

Thanks for the clarification Eric.

Philippe Leybaert 2009-09-25 14:35:33

ansaurus

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Trying to assign return type as void

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