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POASP.NET - Separation of concerns
 

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    <p>Imagine the following scenario - we have Page1 which contains controls Control A and Control B.</p> <p>Say Control A has a button, and on the click of this button we want Control B to react. But we want to do this in an abstract fashion, i.e. we can't have Control B knowing anything about Control A, and vice versa.</p> <p>That way we can develop these controls in isolation, and drive them by unit-testing.</p> <p>Now, I thought I had the solution, just want to know what you guys think of it.</p> <p>On Control A's button click, I put a 'message' on the Session, i.e. Session["MESSAGES"] = "ControlA_Click".</p> <p>In Page1, on the Page_LoadComplete(), I put a call to ProcessMessages, which looks like this:</p> <pre><code> List&lt;Message&gt; messages = SessionMessages.GetMessageList(Page); foreach(Message m in messages) { //Get Controls ControlA controlA = FindControl("controlA") as ControlA; controlA .ProcessMessage(m); ControlB controlB = FindControl("controlB") as ControlB; controlB.ProcessMessage(m); } </code></pre> <p>in ControlB's ProcessMessage() method, we can react to the messages that ControlB is interested in, like so:</p> <pre><code> if (m.MessageName == SessionMessages.C_MESSAGE_SEARCH) { this.Visible = true; } </code></pre> <p>To me, this seems to work. It allows us to develop these controls completely separately from eachother, while still allowing for inter-control-communication at an abstract level.</p> <p>The only thing I can think of that might bring this crashing down is <em>perhaps</em> the ASP.NET life-cycle in relation to Pages and User Controls. The way I figure it though is that ALL events should have been processed on the controls before Page_LoadComplete() is called on the owning Page.</p> <p>Thoughts?</p>
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    1. CO@Steven - you're right, meant to say that I'm sort of aware I'm abusing Session a bit here.... I suppose I'm looking for 'anywhere' I can store some state info. But looking forward to opinions on whether this whole concept will fly!
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