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Async question 02 Mar 2023 12:00 #25501

robert

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Posts: 3600

Wolfgang,
We also accept the discard name '_' in our code.
Did you try

self:Post( { _ => self:done := true }, null )

Robert

XSharp Development Team
The Netherlands

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Async question 02 Mar 2023 12:13 #25502

wriedmann
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Posts: 3366

Hi Robert,
ok, thank you very much, that works.
But how do I add an async keyword to a lamda expression?

synch.Post(async _ =>
            {
                try
                {
                    await task();
                }
                catch (Exception e)
                {
                    synch.InnerException = e;
                    throw;
                }
                finally
                {
                    synch.EndMessageLoop();
                }
            }, null);

does not works as

synch:Post( { _ =>
	    try
        await task()
	    catch e as Exception
        synch.InnerException := e
        throw
	    finally
        synch:EndMessageLoop()
	    end try
	}, null )

and adding the async before the underscore like

synch:Post( { async _ =>
	    try

gives

error XS9002: Parser: unexpected input '_'

Thank you again!
Wolfgang

Wolfgang Riedmann
Meran, South Tyrol, Italy

www.riedmann.it - docs.xsharp.it

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Async question 02 Mar 2023 14:06 #25504

robert

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Posts: 3600

Wolfgang,

Change the lambda to a delegate

synch:Post(  async delegate(_ as object)  { 
	try
           await task()
	catch e as Exception
            synch.InnerException := e
             throw
	finally
            synch:EndMessageLoop()
	 end try
	}, null )

Note I did not test this since I do not have all the code

Robert

XSharp Development Team
The Netherlands

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Async question 02 Mar 2023 20:19 #25510

wriedmann
Topic Author

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Posts: 3366

Hi Robert,
thank you very much, my code compiles now without error.And it works also <g>.I have attached the entire prg file here if someone other needs it: