未将对象引用设置到对象的实例
学生症 2012-04-21 07:53:24 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 41: <ItemTemplate>
行 42: <asp:ImageButton ID="imgUpdate" runat="server" CommandArgument='<%# Eval("ID") %>' Visible='<%# (int)Eval("ID") > 1 ? true : false %>' ImageUrl="~/App_Themes/Aspnet3DBWeb/Images/edit.png" CommandName="update" />
行 43: <asp:ImageButton ID="imgUp" runat="server" CommandName="up" Visible='<%# (int)Eval("ShowOrder") > 1 ? true : false %>' ImageUrl="~/App_Themes/Aspnet3DBWeb/Images/up.png" AlternateText="上移" CommandArgument='<%# Eval("ID") %>' />
行 44: <asp:ImageButton ID="imgDown" runat="server" CommandName="down" Visible='<%# (int)Eval("ShowOrder") < (int)Eval("SiblingCount") ? true : false %>' ImageUrl="~/App_Themes/Aspnet3DBWeb/Images/down.png" AlternateText="下移" CommandArgument='<%# Eval("ID") %>' />
行 45: <asp:ImageButton ID="imgDelete" runat="server" Visible='<%# (int)Eval("SubCount") > 0 ? false : true %>' CommandArgument='<%# Eval("ID") %>' ImageUrl="~/App_Themes/Aspnet3DBWeb/Images/delete.png" CommandName="del" />
源文件: d:\vs2010webs\ASPNET3Shopping\Category\Category.aspx 行: 43
堆栈跟踪:
[NullReferenceException: 未将对象引用设置到对象的实例。]
ASP.category_category_aspx.__DataBinding__control23(Object sender, EventArgs e) in d:\vs2010webs\ASPNET3Shopping\Category\Category.aspx:43
System.Web.UI.Control.OnDataBinding(EventArgs e) +91
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +92
System.Web.UI.Control.DataBind() +15
System.Web.UI.Control.DataBindChildren() +201
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
System.Web.UI.Control.DataBind() +15
System.Web.UI.Control.DataBindChildren() +201
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +101
System.Web.UI.Control.DataBind() +15
System.Web.UI.WebControls.GridView.CreateRow(Int32 rowIndex, Int32 dataSourceIndex, DataControlRowType rowType, DataControlRowState rowState, Boolean dataBind, Object dataItem, DataControlField[] fields, TableRowCollection rows, PagedDataSource pagedDataSource) +166
System.Web.UI.WebControls.GridView.CreateChildControls(IEnumerable dataSource, Boolean dataBinding) +3098
System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +66
System.Web.UI.WebControls.GridView.PerformDataBinding(IEnumerable data) +14
System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +128
System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +33
System.Web.UI.WebControls.DataBoundControl.PerformSelect() +143
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +74
System.Web.UI.WebControls.GridView.DataBind() +4
Category_Category.BindPageData() in d:\vs2010webs\ASPNET3Shopping\Category\Category.aspx.cs:38
Category_Category.Page_Load(Object sender, EventArgs e) in d:\vs2010webs\ASPNET3Shopping\Category\Category.aspx.cs:28
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
System.Web.UI.Control.OnLoad(EventArgs e) +91
System.Web.UI.Control.LoadRecursive() +74
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207
菜鸟请问各位该怎么解决啊