有人可以帮我理解这个堆栈跟踪吗？

我在我的网站上发送一个Object reference not set to an instance of an object错误，通过电子邮件发送给我。当我转到该页面时，我没有收到任何错误。有人可以解释基于这个堆栈跟踪会发生什么“可能”。我知道渲染有些问题，但我不知道该从哪里出去......谢谢。有人可以帮我理解这个堆栈跟踪吗？

at ASP.controls_si_item_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) 
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 
at System.Web.UI.Control.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.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 
at System.Web.UI.Control.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.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 
at System.Web.UI.Control.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.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 
at System.Web.UI.HtmlControls.HtmlContainerControl.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.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 
at System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) 
at System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) 
at System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) 
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) 
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) 
at System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) 
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 
at System.Web.UI.Control.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.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)

来源

2011-06-01 webnoob

这是一个很深的痕迹;确定你没有发生一些意外的递归？ – 2011-06-01 14:42:06

此控件有一个父控件，它是从派生而来的，但我不认为它正在循环，因为我已经从父控件中删除了initialse。这通常工作正常，它只是一个随机错误：/ – webnoob 2011-06-01 14:44:18

这是MVC？是[这个答案]（http://stackoverflow.com/questions/3289269/object-reference-not-set-to-an-instance-of-an-object）有什么用？ – Town 2011-06-01 14:55:45

终于找到了答案:)在我的.ascx文件中，我有一些基于控件ID选择标签的JavaScript。事实证明，在某些情况下，控制不可用，并因此引发对象引用错误。这是我的代码：

var hdnSCSSelectedTabIndex=$('#<%= hdnSCSSelectedTabIndex.ClientID %>'); 
var tabIndex = hdnSCSSelectedTabIndex.val();

，现在我这样做：

<% if (hdnSCSSelectedTabIndex != null) { %> 
    var hdnSCSSelectedTabIndex=$('#<%= hdnSCSSelectedTabIndex.ClientID %>'); 
    var tabIndex = hdnSCSSelectedTabIndex.val(); 
<% } %>

先后排序的问题出来了。请注意，如果不在我的Web.config文件中设置Debug =“True”，我无法查看问题的原因。

希望这可以帮助别人:)

来源

2011-08-05 11:33:47 webnoob

如果在代码隐藏中发生异常，您可以尝试使用调试版本来获取堆栈跟踪中的行号。
另外我会看IIS请求日志以获取引起此请求的线索。

查看您web.config的compilation部分。您可以在那里启用调试模式，它应该将行号添加到我认为的堆栈跟踪中。

来源

2011-06-01 14:58:00 axk

我该如何解决这个问题？我不知道这在ASP.NET中是可能的。 – webnoob 2011-06-01 15:05:57

我不确定，但它可能会工作，因为有代码生成并编译为控件。在ASP.NET缓存文件夹中查找* controls_si_item_ascx *。 – axk 2011-06-01 15:25:35

有人可以帮我理解这个堆栈跟踪吗？

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