MVC4 httpException.GetHttpCode(); causing NullReferenceExcep

本文关键字：causing NullReferenceExcep httpException GetHttpCode MVC4 | 更新日期: 2023-09-27 18:36:19

我不得不重组我的整个应用程序，从VS Express DB到使用Visual Studio 2012。我不得不删除所有模态并再次重新添加它们。

现在，当我尝试运行该应用程序时，它一直在Global.Asax上掉落.cs

它不断抛出 NullReferenceException --> int exceptionType = httpException.GetHttpCode（）;

我的

应用程序甚至没有运行，似乎本地主机服务器甚至没有加载我的网站

请帮忙

protected void Application_Error()
        {
            if (Context.IsCustomErrorEnabled)
                ShowCustomErrorPage(Server.GetLastError());
        }
        private void ShowCustomErrorPage(Exception exception)
        {
            var httpException = exception as HttpException;
            if (exception != null)
            {
                exception = httpException;
            }
            else
            {
                exception = new HttpException(500, "Internal Server Error", exception);
            }
            Response.Clear();
            Server.ClearError();
            var routeData = new RouteData();
            routeData.Values.Add("Controller", "Error");
            routeData.Values.Add("fromAppErrorEvent", true);
            int exceptionType = httpException.GetHttpCode();
            switch (exceptionType)
            {

                case 403:
                    routeData.Values.Add("action", "HttpError403");
                    break;
                case 404:
                    routeData.Values.Add("action", "NotFound");
                    break;
                case 500:
                    routeData.Values.Add("action", "HttpError500");
                    break;
                default:
                    routeData.Values.Add("action", "GeneralError");
                    routeData.Values.Add("httpStatusCode", httpException.GetHttpCode());
                    break;
            }

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

MVC4 httpException.GetHttpCode(); causing NullReferenceExcep

在上面的逻辑中，可以null httpException - 尝试将代码更改为如下所示的内容：

HttpException httpException = exception as HttpException
    ?? new HttpException(500, "Internal Server Error", exception);
Response.Clear();
Server.ClearError();
var routeData = new RouteData();
routeData.Values.Add("Controller", "Error");
routeData.Values.Add("fromAppErrorEvent", true);
int exceptionType = httpException.GetHttpCode();
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