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    <p>A presenter should be thought of as "autonomous state" in the presentation tier. This means that it is responsible for ensuring that the view's presentation of the model's state is in sync. The reason I bring this up is because the "pattern" of MVP often gets lost in the dogmatic view of <em>how</em> things should be separated. It seems that this is one reason Martin Fowler decided to try to <a href="http://martinfowler.com/eaaDev/ModelViewPresenter.html" rel="noreferrer">clarify the terminology around the MVP</a> pattern.</p> <p>My favored flavor of MVP is the <a href="http://martinfowler.com/eaaDev/PassiveScreen.html" rel="noreferrer">passive view</a>, so my answer is based off of that.</p> <p>I implement composite user controls and forms very often using the passive view pattern. There are essentially 3 different configurations:</p> <ol> <li>One presenter for all user controls in the hierarchy. Flatten the view using an interface.</li> <li>One presenter for each user control in the composite tree. Each parent presenter is responsible for instantiating and initializing its child presenters. The user controls are created at design time, and are able to function without a presenter (with no presentation behavior)</li> <li>One presenter for each user control in the composite tree. All of the presenters are loosely coupled through a higher level controller class. The controller class is responsible for construcing the presenter, wiring them up, and coordinating their events.</li> </ol> <p>Although it is a solution of last resort for me (because of its complexity), I think that the last option is the solution that you are looking for.</p>
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    1. USMichael Meadows
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    1. COWould love a code example of configuration 3.
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    2. COIf one could be provided that would be lovely. I have such a hard time finding details on how to implement MVP patterns in more complicated winforms ...
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      1. USTomas Pajonk
    3. COI have a similar problem with user controls in web forms. The page and each user control have their own distinct and disconnected presenters. It is quite possible for each presenter to load the same underlying data entity. Although the pattern has excellent code reuse, it obviously hits the database more than it should need to.
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