Event handler needed to call method from referred C# library using Menu Item Action

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Posted on by ThienNgo

I have written a simple C# library

In SalesTable form I added a command button as below:

Then I make a simple On_Click event

My question is, how to add a event handler to handle this on click event? The example I found uses OnValidatedWriteHandler, but mine is a button, which call a method.

Thank you in advance,

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Sergei Minozhenko 23,093 on at

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Hi ThienNgo,

But you already added an event handler to handle OnClicked event. Each time when you click on button SendRoadnet it will be executed.

Or do you mean something else?

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ThienNgo 40 on at

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I have not added event handler in C# library. I only defined the OnClicked event.

Because I don't add event handler in C# library, it throws me an error like this:

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Sergei Minozhenko 23,093 on at

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Hi ThienNgo,

It throws an error because you have issues in .net library code itself. I suspect that you have issue with private static Trasportation... variable initialization. Have you tried to comment it out, rebuild library and run again?

Or do you know why type is TransportationWebService, but you instantate object of TransportationWebServiceClient?

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nmaenpaa 101,160 Moderator on at

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As Sergei wrote, it has nothing to do with your event handler. You can run similar code from a runnable class and your C# code would fail the same way. Or, you can run only the C# code and it will fail the same way.

You don't need to add any event handlers in your C# code. The event handler is in x++. it reacts to event in x++ and calls your C# code. The x++ part seems to work ok. You need to debug the C# code to understand what causes the exception.

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Joris dG 17,775 on at

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If you read your error, it complains about your .NET class "type initialization" failing. You can read about type initialization. But from your screenshot, it's like your "private static TransportationWebService = ....". This is executed when your C# type (ReadNetMethods) is being loaded by .NET.

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