输入字符串格式不正确在Gmap构建函数中

Question

以下是显示此错误的代码。 任何帮助赞赏 提前致谢。

private void BuildMap(string itineraryCode)

{


 bool IsMapPresent = false;

 if (!string.IsNullOrEmpty(Session[SessionConstants.LanguageCode].ReturnString()))

{

string languageCode = Session[SessionConstants.LanguageCode].ReturnString();
  CityCollection cityCollection = CityBLL.GetCityMapForItinerary(itineraryCode, languageCode);
  GMarker[] marker;
  GListener[] listner;
  try
  {
    if (cityCollection != null && cityCollection.Count > 0)
    {

      //for modal header



      H3Header.InnerText = cityCollection[0].CountryName;

      marker = new GMarker[cityCollection.Count];
      listner = new GListener[cityCollection.Count];
      int count = 0;
      GCustomCursor customCursor = new GCustomCursor(cursor.pointer, cursor.auto);
      gmapQuoVadis.addCustomCursor(customCursor);
      foreach (CityBLL cityBLL in cityCollection)
      {
        if (cityBLL.GmapLatitude != 0.0 && cityBLL.GmapLongitude != 0.0)
        {
          GIcon icon = new GIcon();
          icon.image = hostURL + "/custom_images/gmapicon0.png";

          GLatLng latlng = new GLatLng(cityBLL.GmapLatitude, cityBLL.GmapLongitude);
          gmapQuoVadis.setCenter(latlng);
          gmapQuoVadis.Add(new GControl(GControl.preBuilt.MenuMapTypeControl));
          gmapQuoVadis.Add(new GControl(GControl.preBuilt.LargeMapControl));

          if (cityBLL.GmapZoomLevel != 0 && cityBLL.GmapZoomLevel > 0)
          {
            gmapQuoVadis.GZoom = cityBLL.GmapZoomLevel;
          }
          else
          {
              int number;
              bool result = Int32.TryParse(WebAppSettingKeys.GetAppKeyValue(WebAppSettingKeys.ZoomLevelForMap), out number);
              gmapQuoVadis.GZoom = number;
          }
          marker[count] = new GMarker(latlng, icon);
          listner[count] = new GListener(marker[count].ID, GListener.Event.click, "showLargeMap");
          gmapQuoVadis.addGMarker(marker[count]);
          gmapQuoVadis.addListener(listner[count]);

          IsMapPresent = true;
        }
      }
      if (IsMapPresent == false)
      {
        divMap.Visible = false;
        divMapNotFound.Visible = true;
        divMapNotFound.InnerHtml = "<img style='height:219px;width:255px;' src="+hostURL+"custom_images/noimg.jpg"+" />";
      }
      else
        divMap.Visible = true;
    }
  }
  finally
  {
    cityCollection = null;
    gmapQuoVadis = null;
    marker = null;
    listner = null;
  }
}
else
{
  Response.Redirect(hostURL + Common.PageName.SESSION_EXPIRED);
}

}