在MVC中将状态代码500更改为404

Question

我想将所有错误重定向到mvc 4中状态码为404的一个动作，我已将其设置为Web配置，但是当发生内部错误时，页面将重定向到我的404动作，但状态码为500

 <customErrors defaultRedirect="/_404" mode="On" redirectMode="ResponseRewrite">

    <error statusCode="404"
       redirect="http://www.khanoumi.com/_404"/>
<error statusCode="500"
       redirect="http://www.khanoumi.com/_404"/>
  </customErrors>

这也是我的行动：

 public ActionResult Index()
        {
            Server.ClearError();
            Response.Clear();
            Response.ClearHeaders();
            Response.StatusCode = 404;
            Response.TrySkipIisCustomErrors = true;
            return View();
        }

Answer 1

您可以通过使用强制404错误

throw new HttpException(404, "Your error message");

或对于Asp.Net MVC 4，您可以使用：

if (condition)
{
    return HttpNotFound("Your error message");
}

您也可以为此创建自定义属性，如下所示：

public class HandleNotFoundAttribute : ActionFilterAttribute, IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
        var httpException = filterContext.Exception.GetBaseException() as HttpException;
        if (httpException != null && (httpException.GetHttpCode() == 404 ||
                                      httpException.GetHttpCode() == 500))
        {
            filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;
            filterContext.ExceptionHandled = true;
            filterContext.HttpContext.Response.StatusCode = (int) HttpStatusCode.NotFound;
            filterContext.Result = new ViewResult
                                {
                                  ViewName = "404",
                                  ViewData = filterContext.Controller.ViewData
                                };
        }
    }
}