How can I provide the HandleErrorInfo model to an object?

Question

I am writing an ASP.NET MVC application and I ran into the following problem. I want to create custom error pages with detailed error information (for example, an error message or which controller caused the error), but I cannot provide the model in the view with the HandleErrorInfo object.

First, I configured the Web.config file to handle user errors:

<customErrors mode="On" defaultRedirect="~/Error"> <error statusCode="404" redirect="~/Error/NotFound"/> </customErrors> 

Then I created an error controller to manage the error views:

 public class ErrorController : Controller { public ActionResult Index() { return View("Error"); } public ViewResult NotFound() { Response.StatusCode = 404; return View("NotFound"); } } 

And in the view, I added the model type:

 @model System.Web.Mvc.HandleErrorInfo 

But the model is null every time, and I don’t know how to pass the correct object with error data to the view and where this object should be created. Can you help me? Is it possible to do so?

Answer 1

So you are dealing with two different layers. <customErrors> is different from the basic ASP.NET framework. Then HandleError is different from MVC structure. When you use <customErrors> , ASP.NET does not know how to pass the exception information to the view, it will just load / redirect you to the error page.

To do a job review, you need to save everything inside the MVC ecosystem. Therefore you need to use HandleErrorAttribute or varient. You can see in the source code of the attribute , it is trying to detect when an unhandled exception has occurred, and if custom errors are included, then it will launch a new ViewResult with an instance of HandleErrorInfo that contains information about the exception inside it.

It should be noted that in the MVC project, by default, HandleErrorAttribute is used as a global filter inside the file App_Start/FilterConfig.cs .

Answer 2

I found another way. Sending error model for viewing from the controller.

1. Global.asax

 protected void Application_Error(object sender, EventArgs e) { var httpContext = ((MvcApplication)sender).Context; var currentController = " "; var currentAction = " "; var currentRouteData = RouteTable.Routes.GetRouteData(new HttpContextWrapper(httpContext)); if (currentRouteData != null) { if (currentRouteData.Values["controller"] != null && !String.IsNullOrEmpty(currentRouteData.Values["controller"].ToString())) { currentController = currentRouteData.Values["controller"].ToString(); } if (currentRouteData.Values["action"] != null && !String.IsNullOrEmpty(currentRouteData.Values["action"].ToString())) { currentAction = currentRouteData.Values["action"].ToString(); } } var ex = Server.GetLastError(); //var controller = new ErrorController(); var routeData = new RouteData(); var action = "GenericError"; if (ex is HttpException) { var httpEx = ex as HttpException; switch (httpEx.GetHttpCode()) { case 404: action = "NotFound"; break; // others if any } } httpContext.ClearError(); httpContext.Response.Clear(); httpContext.Response.StatusCode = ex is HttpException ? ((HttpException)ex).GetHttpCode() : 500; httpContext.Response.TrySkipIisCustomErrors = true; routeData.Values["controller"] = "Error"; routeData.Values["action"] = action; routeData.Values["exception"] = new HandleErrorInfo(ex, currentController, currentAction); IController errormanagerController = new ErrorController(); HttpContextWrapper wrapper = new HttpContextWrapper(httpContext); var rc = new RequestContext(wrapper, routeData); errormanagerController.Execute(rc); } 

2. Error controller:

 public class ErrorController : Controller { // // GET: /Error/ public ActionResult Index() { return RedirectToAction("GenericError", new HandleErrorInfo(new HttpException(403, "Dont allow access the error pages"), "ErrorController", "Index")); } public ViewResult GenericError(HandleErrorInfo exception) { return View("Error", exception); } public ViewResult NotFound(HandleErrorInfo exception) { ViewBag.Title = "Page Not Found"; return View("Error", exception); } } 

3. View / Shared / Error.cshtml:

 @model System.Web.Mvc.HandleErrorInfo @{ ViewBag.Title = ViewBag.Title ?? "Internal Server Error"; } <div class="list-header clearfix"> <span>Error : @ViewBag.Title</span> </div> <div class="list-sfs-holder"> <div class="alert alert-error"> An unexpected error has occurred. Please contact the system administrator. </div> @if (Model != null && HttpContext.Current.IsDebuggingEnabled) { <div> <p> <b>Exception:</b> @Model.Exception.Message<br /> <b>Controller:</b> @Model.ControllerName<br /> <b>Action:</b> @Model.ActionName </p> <div style="overflow: scroll"> <pre> @Model.Exception.StackTrace </pre> </div> </div> } </div> 

4. web.config:

 <system.web> <customErrors mode="Off" /> </system.web> 

Credits: https://thatsimpleidea.wordpress.com/2013/10/28/mvc-error-page-implementation/#comment-166

Answer 3

This did not work for me, but it inspired me that my Global.asax.Application_Start() did not register the FilterConfig class:

 FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); 

This, combined with Stephen V's answer, resolved my null model problem.