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Dynamics AX7 Development 6–Adding Delegates for Customised Code in Higher Package

Dynamics AX is split into multiple models the main ones are as follows; Application suite, Application Foundation and Application Platform.

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If you look at some of the debendencies you see how the organization of model affects the assemblies (how it is compiled).

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In some cases you have to modify the Foundation or the Platform. The issue with that is you are unable to reference code sitting in a higher package (model). In short a higher model can take dependencies and access elements in a lower model but not the other way around.

To get around this limitation you have to use a delegate method. Below is an example of a delegate. The PrintMgmtDocType has a method to get the default report form.

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See how the delegate method is called from the Foundation and uses an EventHanderResult to pass around the result.

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The delegate method doesnt have to have any code. It is there to allow other methods to subscribe to it.

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Now this is the calls in the Suite. Notice how to subscribe by adding the SubscribesTo attribute.

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Refer to the Microsoft Wiki. It has some really good examples.

https://ax.help.dynamics.com/en/wiki/delegates-for-migration/

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