在 MVC4 中捕获 404 错误

Question

我在处理 HTTP 错误 404.0 - 未找到时遇到问题。我已经打开了

<customErrors mode="On" defaultRedirect="~/Error/General">
      <error statusCode="404" redirect="~/Error/HttpError404" />
      <error statusCode="500" redirect="~/Error/HttpError500" />
    </customErrors>

在 Web.Config 中。但问题依然存在。我也试过这个解决方案（但它从来没有达到方法）：

protected void Application_Error()
    {
      var exception = Server.GetLastError();
      var httpException = exception as HttpException;
      Response.Clear();
      Server.ClearError();
      var routeData = new RouteData();
      routeData.Values["controller"] = "Errors";
      routeData.Values["action"] = "General";
      routeData.Values["exception"] = exception;
      Response.StatusCode = 500;
      if (httpException != null)
      {
        Response.StatusCode = httpException.GetHttpCode();
        switch (Response.StatusCode)
        {
          case 403:
            routeData.Values["action"] = "HttpError404";
            break;
          case 404:
            routeData.Values["action"] = "HttpError404";
            break;
        }
      }

      IController errorsController = new ErrorController();
      var rc = new RequestContext(new HttpContextWrapper(Context), routeData);
      errorsController.Execute(rc);
    }

由@Darin Dimitrov提供

这是控制器：

public class ErrorController : Controller
  {

    public ActionResult HttpError404(string error)
    {
      ViewData["Title"] = "Sorry, an error occurred while processing your request. (404)";
      ViewData["Description"] = error;
      return View("Index");
    }

    public ActionResult HttpError500(string error)
    {
      ViewData["Title"] = "Sorry, an error occurred while processing your request. (500)";
      ViewData["Description"] = error;
      return View("Index");
    }


    public ActionResult General(string error)
    {
      ViewData["Title"] = "Sorry, an error occurred while processing your request.";
      ViewData["Description"] = error;
      return this.View();

    }

Answer 1

好的，感谢@alistair-findlay 和this website，我找到了解决方案。 这就是 web.config 现在的样子：

<system.web>
    <customErrors mode="On" defaultRedirect="~/Error/General" redirectMode="ResponseRewrite"> 
        </customErrors>
 </system.web>
  <system.webServer>
<httpErrors errorMode="Detailed" defaultResponseMode="Redirect">
      <clear/>
      <error statusCode="404" path="/Error/HttpError404"/>
    </httpErrors>

  </system.webServer

这是 Global.asax.cs：

  protected void Application_Error()
    {

      if (Context.IsCustomErrorEnabled)
        ShowCustomErrorPage(Server.GetLastError());

    }
    private void ShowCustomErrorPage(Exception exception)
    {
      var httpException = exception as HttpException ?? new HttpException(500, "Internal Server Error", exception);

      Response.Clear();
      var routeData = new RouteData();
      routeData.Values.Add("controller", "Error");
      routeData.Values.Add("fromAppErrorEvent", true);

      switch (httpException.GetHttpCode())
      {
        case 403:
          routeData.Values.Add("action", "HttpError403");
          break;

        case 404:
          routeData.Values.Add("action", "HttpError404");
          break;

        case 500:
          routeData.Values.Add("action", "HttpError500");
          break;

        default:
          routeData.Values.Add("action", "GeneralError");
          routeData.Values.Add("httpStatusCode", httpException.GetHttpCode());
          break;
      }

      Server.ClearError();

      IController controller = new ErrorController();
      controller.Execute(new RequestContext(new HttpContextWrapper(Context), routeData));
    }

最后：

 public class ErrorController : Controller
  {

    public ActionResult HttpError403(string error)
    {
      ViewBag.Description = error;
      return this.View();
    }

Answer 2

您是否实现了 ErrorController 来处理 customErrors 属性中的重定向？在您的情况下，它看起来像这样：

public class ErrorController : Controller
{
    public ActionResult General()
    {
        return View();
    }

    public ActionResult HttpError404()
    {
        return View();
    }

    public ActionResult HttpError500()
    {
        return View();
    }
}

您还需要为 Views 文件夹中的每个 ActionResult 实现视图。

在记录错误方面，您需要在Application_Error 事件处理程序中实现这一点，如下所示：

protected void Application_Error()
{
    var exception = Server.GetLastError();
    var httpException = exception as HttpException;
    // Do logging here
}

这是为了在 302 重定向到上面ErrorController 中定义的错误页面之前“捕获”错误。