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    copied!<p>I found the cause for this, methinks:</p> <p>This method is in the WrappedAsyncResult class, which the MvcHandler class uses via BeginProcessRequest:</p> <pre><code>public static IAsyncResult BeginSynchronous&lt;TResult&gt;(AsyncCallback callback, object state, Func&lt;TResult&gt; func, object tag) { BeginInvokeDelegate beginDelegate = delegate (AsyncCallback asyncCallback, object asyncState) { SimpleAsyncResult result = new SimpleAsyncResult(asyncState); result.MarkCompleted(true, asyncCallback); return result; }; EndInvokeDelegate&lt;TResult&gt; endDelegate = _ =&gt; func(); WrappedAsyncResult&lt;TResult&gt; result = new WrappedAsyncResult&lt;TResult&gt;(beginDelegate, endDelegate, tag); result.Begin(callback, state, -1); return result; } </code></pre> <p>where "Begin" is:</p> <pre><code>public void Begin(AsyncCallback callback, object state, int timeout) { bool completedSynchronously; this._originalCallback = callback; lock (this._beginDelegateLockObj) { this._innerAsyncResult = this._beginDelegate(new AsyncCallback(this.HandleAsynchronousCompletion), state); completedSynchronously = this._innerAsyncResult.CompletedSynchronously; if (!completedSynchronously &amp;&amp; (timeout &gt; -1)) { this.CreateTimer(timeout); } } if (completedSynchronously &amp;&amp; (callback != null)) { callback(this); } } </code></pre> <p>EDIT: have come up with a ham-handed way of forcing MVC controller actions to "time out", although the mechanism is a bit brutish:</p> <pre><code>public class TimeoutController : Controller { private bool _isExecuting = false; private int _controllerTimeout = 5000; private Thread _executingThread; private readonly object _syncRoot = new object(); protected override void ExecuteCore() { _executingThread = Thread.CurrentThread; ThreadPool.QueueUserWorkItem(o =&gt; { Thread.Sleep(_controllerTimeout); if (_isExecuting) { _executingThread.Abort(); } }); base.ExecuteCore(); } protected override void OnActionExecuting(ActionExecutingContext filterContext) { _isExecuting = true; base.OnActionExecuting(filterContext); } protected override void OnActionExecuted(ActionExecutedContext filterContext) { _isExecuting = false; base.OnActionExecuted(filterContext); } public int ControllerTimeout { get { int retVal; lock(_syncRoot) { retVal = _controllerTimeout; } return retVal; } set { lock(_syncRoot) { _controllerTimeout = value; } } } } </code></pre>
 

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