Microsoft Dynamics AX (Archived)

Add a delegate to a static method

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Posted on by Community Member

Hi,

Is there a way we can add a delegate to a static method in AX.

Thanks in advance

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Martin Dráb 237,878 Most Valuable Professional on at

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If you mean attaching a pre- or post-method event handler: yes, you can.

If you mean calling a delegate: yes, you can.

If you mean subscribing to a delegate: yes, you can.

If you mean defining a new delegate (e.g. delegate void initialized(){}) inside a method (static or not): no, it isn't possible.

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Community Member on at

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Thanks Martin.

So does a delegate for a static method need to be declared static as well.

For example:

class Example

{

delegate static void testDelegate(EventHandlerResult res){}

static void someMethod()

{

-- some code

// my extension code

Example::testDelegate(new EventHandlerResult ());

}

}

Please suggest if this is the right method to call a delegate from a static method. Thanks in advance.

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Martin Dráb 237,878 Most Valuable Professional on at

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You can use static delegates, although it is a bit dangerous design. When you start using static members like this, you must think about implications of multi-threading and potential impact on garbage collection. I strongly recommend you start using objects instead of static methods and static events - it's safer and easier to extend in future. Even using a singleton object is much better than static members.

But if you have a good reason to do it (and you plan how to avoid problems with the static nature of such a design), you can declare your delegate like static delegate void testDelegate(...).

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Basheer17 2,720 on at

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Yes you should use a static delegate. Initialize EventHandlerResult, pass the variable in delegate as parameter instead of new EventHandlerResult() to get the results.

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