Server kann nicht Inhaltstyp nach HTTP-Header haben

-1

Ausnahme gesendet worden

ich für Code unten "Server cannot set content type after HTTP headers have been sent " Ausnahme bin immer zu exportierenServer kann nicht Inhaltstyp nach HTTP-Header haben

private void ExportToExcel() 
    { 
     try 
     { 
      DateTime date = new DateTime(); 

      HttpContext.Current.Response.Clear(); 
      HttpContext.Current.Response.ClearContent(); 

      HttpContext.Current.Response.ClearHeaders(); 
      HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName + ".xls"); 
      HttpContext.Current.Response.ContentType = "application/ms-excel"; 
      HttpContext.Current.Response.BufferOutput = true; 
      HttpContext.Current.Response.Write(@"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">"); 

      HttpContext.Current.Response.Charset = "utf-8"; 

      //Check the current culture;if its polish/Czech set the windows code to 1250 else set the windows code to 1252 

      if (CultureInfo.CurrentCulture.ThreeLetterISOLanguageName.ToUpper(CultureInfo.CurrentCulture) == "CES" || CultureInfo.CurrentCulture.ThreeLetterISOLanguageName.ToUpper(CultureInfo.CurrentCulture) == "POL") 
       HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250"); 
      else 
       HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1252"); 

      HttpContext.Current.Response.Write("<font style='font-size:10.0pt; font-family:Calibri;'>"); 
      HttpContext.Current.Response.Write("<BR><BR><BR>"); 
      HttpContext.Current.Response.Write("<Table border='1' bgColor='#ffffff' " + 
       "borderColor='#000000' cellSpacing='0' cellPadding='0' " + 
       "style='font-size:10.0pt; font-family:Calibri; background:white;'> <TR>"); 

      for (int j = 0; j < gridView.Columns.Count; j++) 
      { 
       HttpContext.Current.Response.Write("<Td>"); 
       HttpContext.Current.Response.Write("<B>"); 
       HttpContext.Current.Response.Write(gridView.Columns[j].HeaderText.ToString()); 
       HttpContext.Current.Response.Write("</B>"); 
       HttpContext.Current.Response.Write("</Td>"); 
      } 
      HttpContext.Current.Response.Write("</TR>"); 
      foreach (DataRow row in orderDetails.Rows) 
      { 
       //format DateTime to show only Date 
       if (isDeliveries && row[4].ToString() != null) 
        date = (DateTime)row[4]; 
       else if (row[5].ToString() != null) 
        date = (DateTime)row[5]; 

       HttpContext.Current.Response.Write("<TR>"); 
       for (int i = 0; i < orderDetails.Columns.Count; i++) 
       { 
        if (i < columnsOrder.Length) 
        { 
         if (i == 4) 
         { 
          HttpContext.Current.Response.Write("<Td>"); 
          HttpContext.Current.Response.Write(date.ToString("d")); 
          HttpContext.Current.Response.Write("</Td>"); 
         } 
         else 
         { 
          HttpContext.Current.Response.Write("<Td>"); 
          HttpContext.Current.Response.Write(row[columnsOrder[i]].ToString()); 
          HttpContext.Current.Response.Write("</Td>"); 
         } 
        } 
       } 
       HttpContext.Current.Response.Write("</TR>"); 
      } 

      HttpContext.Current.Response.Write("</Table>"); 
      HttpContext.Current.Response.Write("</font>"); 
      HttpContext.Current.Response.Flush(); 

      HttpContext.Current.Response.SuppressContent = true; 
      HttpContext.Current.ApplicationInstance.CompleteRequest(); 
     } 
     catch (Exception ex) 
     { 
     } 
    }

Stacktrace

at System.Web.HttpResponse.set_ContentType(String value) 
    at System.Web.HttpResponseInternalWrapper.set_ContentType(String value) 
    at System.Web.UI.PageRequestManager.RenderPageCallback(HtmlTextWriter writer, Control pageControl) 
    at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 
    at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 
    at System.Web.UI.Page.Render(HtmlTextWriter writer) 
    at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) 
    at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) 
    at System.Web.UI.Control.RenderControl(HtmlTextWriter writer) 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Auch ich nach viel Abhilfe zu übertreffen Ich bin nicht in der Lage, es zu beheben. Kann mir jemand helfen?

Quelle

2016-04-13 Richa

Sie versuchen, den Inhalt zu setzen Geben Sie eine Zeile ein, nachdem Sie die Header gesetzt haben ... versuchen Sie das vielleicht? – TZHX

In welcher Zeile läuft die Ausnahme? –

@TZHX Ich versuchte zu wechseln, aber immer noch das gleiche Ergebnis – Richa

Der folgende Code-Block tatsächlich ist die Einstellung den Content-Encoding HTTP-Header

if (CultureInfo.CurrentCulture.ThreeLetterISOLanguageName.ToUpper(CultureInfo.CurrentCulture) == "CES" || CultureInfo.CurrentCulture.ThreeLetterISOLanguageName.ToUpper(CultureInfo.CurrentCulture) == "POL") 
    HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250"); 
else 
    HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1252");

So muss aufgerufen werden, bevor Sie Inhalte in den Antwortstream schreiben, das heißt HttpContext.Current.Response.Write(@"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">");

Quelle

2016-04-14 05:02:14 Itsik

Server kann nicht Inhaltstyp nach HTTP-Header haben

Antwort

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