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我有这样的事情中列出....添加字符串回传

switch (PostBackControlParentId) 
      { 
       case "": 
        SearchResults.InnerText = "Sorry. There was an Error."; 
        break; 
       case "GamesTabUpdatePanel": 
        Var_Games_Platform = PlatformDropdown.SelectedValue; 
        Var_Games_Rating = Convert.ToDecimal(Games_RatingTextBox.Text); 
        Var_Games_Developer = DeveloperDropdown.SelectedValue; 
        Var_Games_Publisher = PublisherDropdown.SelectedValue; 
        Var_Games_Year = Convert.ToInt16(YearDropdown.SelectedItem.Value); 
        if (Games_OnlyAvailableCheckBox.Checked) 
        { 
         Var_Games_AvailableOnly = true; 
        } 

        foreach (ListItem Genre in Games_GenreList.Items) 
        { 
         if (Genre.Selected) 
         { 
          SearchResults.InnerText = SearchResults.InnerText + Genre.ToString(); 
          Var_Games_Genres.Add(Genre.Value.ToString());**///The line of interest........** 
         } 
        } 
        //Get Query Data.. 
        //Pass to SQL 
        //Get DataSet 
        //WriteStuff. 
        break; 
       case "MoviesTabUpdatePanel": 
        break; 
       case "EpisodesTabUpdatePanel": 
        break; 
       case "TVShowsTabUpdatePanel": 
        break; 
      }

现在，当我不做

Var_Games_Genres.Add（Genre.Value。的ToString（））; ///关注行........

UpdatePanel的显示正是我想要的。（在CheckBoxList的选择的游戏流派的列表命名Games_GenreList。但当我添加以下行 Var_Games_Genres.Add（Genre.Value.ToString（））; ///感兴趣的线........ 它不会更改任何更新面板上的内容而且我也得到了这个谷歌浏览器的控制台....

Uncaught Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object. ScriptResource.axd:847 
Error$create ScriptResource.axd:847 
PageRequestManager$_createPageRequestManagerServerError ScriptResource.axd:766 
PageRequestManager$_parseDelta ScriptResource.axd:1653 
PageRequestManager$_onFormSubmitCompleted ScriptResource.axd:1414 
(anonymous function) ScriptResource.axd:628 
(anonymous function) ScriptResource.axd:4338 
raise ScriptResource.axd:7429 
WebRequest$completed ScriptResource.axd:7433 
XMLHttpExecutor._onReadyStateChange ScriptResource.axd:6857

我真的不知道发生了什么事情是错误的。谢谢。

来源

2013-01-05 Kaushik DB

请尝试刷新你的更新面板 –

我试过Updatepanel.update（）; 但没用。 –

请检查Var_Games_Genres是否有实例，这意味着您是否使用List创建了它Var_Games_Genres = new List（）; –

尝试

List Var_Games_Genres = new List();

开关罩之前

来源

2013-01-05 18:40:39

是的。修复它。谢谢。 –

他可能没有足够的积分来upvote – MethodMan

添加字符串回传

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