Global.asax中的Application_Error自定义错误处理程序

Question

I want to detect and redirect custom errors from Global.asax. It returns 200 ok or null. I am not sure how can i detect and redirect to errors automatically. I hope you guys have an idea.

In Web.Config

<system.web>
    <customErrors mode="On" />
</system.web>
<system.webServer>
    <httpErrors existingResponse="PassThrough"/>
</system.webServer>

In Global.asax

protected void Application_Error(object sender, EventArgs e)
{
    Response.TrySkipIisCustomErrors = true;

                Exception ex = Server.GetLastError();

                if (ex is HttpException && ((HttpException)ex).GetHttpCode() == 200)
                {
                    errormessage = ex.Message;
                    Response.RedirectToRoute("error");
                }
                else if (ex is HttpException && ((HttpException)ex).GetHttpCode() == 400)
                {
                    errormessage = ex.Message;
                   Response.RedirectToRoute("error");
                }
                else if (ex is HttpException && ((HttpException)ex).GetHttpCode() == 404)
                {
                    errormessage = ex.Message;
                    Response.RedirectToRoute("error");
                }
                else if (ex is HttpException && ((HttpException)ex).GetHttpCode() == 500)
                {
                    errormessage = ex.Message;
                    Response.RedirectToRoute("error");
                }
                else
                {
                    errormessage = ex.Message;
                    Response.RedirectToRoute("error");
                }
    Server.ClearError();
}

Answer 1

Well,

I found temporary solution for my problem. It's not the best but you may need it.

In Web.Config

<system.web>
    <customErrors mode="On" /> // On or Off doesn't matter ISS 7 or newer version
</system.web>
<system.webServer>
    <httpErrors existingResponse="Auto">
     <clear/>
     <error statusCode="404" path="/notfound.aspx" responseMode="ExecuteURL" />
     </httpErrors>
</system.webServer>

In Global.asax

HttpException httpexception = Server.GetLastError().GetBaseException() as HttpException;
string ex_message = httpexception.InnerException;
// send or save errors here
Server.ClearError();
Response.Redirect("error");  

Note: I didn't handle 404 error from codebehind, web.configuration helps about it.