“/”应用程序中的服务器错误。

未将对象引用设置到对象的实例。

说明: 执行当前 Web 请求期间,出现未经处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。

源错误:


行 21:                             <strong>教师照片:</strong></td>
行 22:                         <td bgcolor="#FFFFFF">
行 23:                             <img src="../admin/upfiles/userpic/<%=(dr["imgurl"].ToString()==string.Empty?"no-photo.jpg":dr["imgurl"].ToString())%>"  height="248" /></td>
行 24:                     </tr>
行 25:                     <tr>

源文件: e:\南京理工大学实践教学管理系统\南理工实验教学管理系统\zhanshi\teacherzhanshi.aspx    行: 23

堆栈跟踪:


[NullReferenceException: 未将对象引用设置到对象的实例。]
   ASP.zhanshi_teacherzhanshi_aspx.__Renderform1(HtmlTextWriter __w, Control parameterContainer) in e:\南京理工大学实践教学管理系统\南理工实验教学管理系统\zhanshi\teacherzhanshi.aspx:23
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +270
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +9836698
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +32
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +55
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +43
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +129
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +14
   System.Web.UI.Page.Render(HtmlTextWriter writer) +30
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +67
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +101
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +27
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1342


版本信息: Microsoft .NET Framework 版本:4.0.30319; ASP.NET 版本:4.8.4110.0