How Can I Implement Custom Error Handling with Exception Details in ASP.NET MVC?

Custom error handling in ASP.NET MVC: Application_Error event in Global.asax

In ASP.NET MVC applications, the Application_Error event in Global.asax is crucial for handling unhandled exceptions and providing custom error pages.

Pass data to error controller

The current code in the Application_Error event determines the HTTP status code and sets the RouteData object to pass to the Error controller. However, the code does not provide a way to pass the exception details to the controller.

A robust approach is to use query string parameters to transmit exception information. The modified Application_Error code is as follows:

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:
                // 页面未找到
                action = "HttpError404";
                break;
            case 500:
                // 服务器错误
                action = "HttpError500";
                break;
            default:
                action = "General";
                break;
        }

        // 清除服务器上的错误
        Server.ClearError();

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

Error Controller

The error controller will receive the exception message as a query string parameter:

// GET: /Error/HttpError404
public ActionResult HttpError404(string message)
{
    return View("SomeView", message);
}

Notes

While this approach allows for flexible exception handling, please consider the following:

• Avoid infinite loops in error handling.
• Redirecting to an ASP.NET MVC action creates a session object for the request, which may impact performance on high-usage systems.
• Ensure error handling is robust and do not allow sensitive information to be displayed to unauthorized users.

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