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POGetting message from exception thrown by an ASP.NET MVC controller action called from jQuery ajax
 

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  1. POGetting message from exception thrown by an ASP.NET MVC controller action called from jQuery ajax
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    <p>I am trying to secure a controller action that is being called with the jQuery ajax function.</p> <p>In my action method I have the code surrounded by a try-catch block, so I capture all my exceptions and return a JSON result with the exception message. To that point everything works great.</p> <p>The problem begins when I throw an exception outside the try-catch block, for example, if the exception is raised inside a filter action attribute. In that case I cannot return a JSON result because the flow stops abruptly.</p> <p>jQuery catches that exception in the error callback function. But the only place where I have managed to see the exception message is in the xhr.responseText, but it contains the whole "yellow page of death" error from asp.net.</p> <p><em>The very ugly and hackish solution I have used to get the exception message is to extract the text between the &lt;title&gt; tag. But I really hope there is a better way to do this!!</em></p> <p>What would you do in this scenario? How would you secure your ajax actions without writing that logic inside the action method? <strong>How would you show to the user the message from an unhandled exception thrown by an ASP.NET MVC controller action called from jQuery ajax?</strong></p> <p><strong>jQuery Ajax Call:</strong></p> <pre><code>$.ajax({ type: "POST", contentType: "application/json; charset=utf-8", dataType: "json", url: url + "?id=" + id, success: function(data) { if(data.success){ alert('Success'); } else { alert('Fail: ' + data.message); }, error: function(xhr, status, err) { // There has to be a better way to do this!! var title = xhr.responseText.split("&lt;title&gt;")[1].split("&lt;/title&gt;")[0]; alert(title); } }); </code></pre> <p><strong>Controller Action:</strong></p> <pre><code>[MyAttribute] public ActionResult MyAction(int id) { try { // Do something return Json(new { success = true }, JsonRequestBehavior.AllowGet); } catch (Exception exception) { return Json(new { success = false, message = exception.Message }, JsonRequestBehavior.AllowGet); } } </code></pre> <p><strong>Action Filter Attribute:</strong></p> <pre><code>public override void OnActionExecuting(ActionExecutingContext filterContext) { // This causes a 401 Unauthorized HTTP error. throw new UnauthorizedAccessException("Access Denied."); } </code></pre>
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