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POHow do I get certain code to execute before every single controller action in ASP.NET MVC 2?
 

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  1. POHow do I get certain code to execute before every single controller action in ASP.NET MVC 2?
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    <p>I want to check some things about the state of the session, the user agent, etc, and possibly take action and return a special view BEFORE a controller method gets a chance to execute. For example:</p> <p>Most common:<br> User requests Home/Index<br> System checks to make sure x != 0.<br> x does not equal zero, so the Home/Index controller executes like normal.</p> <p>But, sometimes:<br> User requests Home/Index<br> System checks to make sure x != 0.<br> x DOES equal zero. The user must be notified and the requested controller action cannot be allowed to execute. </p> <p>I <em>think</em> this involves the use of ActionFilters. But I have read about them and I don't understand if I can preempt the controller method and return a view before it executes. I am sure I could execute code before the controller method runs, but how do I keep it from running in some instances and return a custom view, or direct to a different controller method?</p> <p>Update: I implemented RM's solution. This is what I did:</p> <pre><code>public class MyAttribute : ActionFilterAttribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { if (myValue == wrongValue) { filterContext.Result = new ViewResult{ViewName = "Notice"}; } base.OnActionExecuting(filterContext); } } </code></pre> <p>Now, when myValue is wrong, those users get the Notice view and the requested controller is never executed. To make this work I applied it to a ControllerBase that all my Controllers inherit from.</p>
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