How Can I Pass Data to My ASP.NET MVC Error Controller for Custom Error Handling?

Effective Custom Error Handling in ASP.NET MVC by Passing Data to the Error Controller

Robust error handling is vital for a positive user experience in ASP.NET MVC applications. While a global Application_Error event in Global.asax.cs offers centralized error management, efficiently passing relevant data to the Error controller requires a strategic approach.

This example utilizes query strings for conveying error information to the Error controller, avoiding the need for multiple error routes. The Application_Error handler is modified to redirect to the appropriate action within the Error controller, embedding the error message in the query string:

<code class="language-csharp">protected void Application_Error(object sender, EventArgs e)
{
    Exception exception = Server.GetLastError();
    Response.Clear();

    HttpException httpException = exception as HttpException;

    if (httpException != null)
    {
        string action;

        switch (httpException.GetHttpCode())
        {
            case 404:
                action = "NotFound";
                break;
            case 500:
                action = "ServerError";
                break;
            default:
                action = "GenericError";
                break;
        }

        Server.ClearError(); // Clear the server-side error

        Response.Redirect(String.Format("~/Error/{0}?message={1}", action, Server.UrlEncode(exception.Message)));
    }
}</code>

The corresponding Error controller actions are then updated to retrieve the message from the query string:

<code class="language-csharp">// GET: /Error/NotFound
public ActionResult NotFound()
{
    string message = Request.QueryString["message"];
    ViewBag.Message = message; // Or use a ViewModel
    return View();
}</code>

This method simplifies error handling by leveraging existing routing. However, it's crucial to consider potential performance implications, especially in high-traffic environments, as repeated use could impact efficiency due to factors like session object management. Careful consideration and optimization are necessary for production deployments.

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