If u want to perform same funtionality in many places of your webdynpro component, create a public method in Component controller and all that method in view.
I am having the same requirement and searching from threads to threads but could able to find the correct way.Could you please tell me the way as u wrote that you found yourself.
Although technically possible (as the solutions have been given) it is highly advisable NOT to do this! Not only is WDA OO based, it is also MVC based. There should be a clear separation of the layers of your logic. So from that simple matter only, you shoudl call a perform from WDA. You should only call methods of a model class. I suppose if you absolutely must reuse existing code, you might a perform state from inside your model class, but even that should be avoided if possible.
Yes, you can very well use PERFORM statement in any Class method or WDA method. You need to just create a executable program (eg testprogram) and include those subroutines in that program. Now in your WDA method, write the following line:
PERFORM subroutine_name IN PROGRAM testprogram USING ... CHANGING .....
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