我用的是vs2008，添加一个listview控件绑定数据源后，调试运行显示：【必须在 ListView“ListView1”上指定项占位符。可通过将控件的 ID 的属性设置为“itemPlaceholder”来指定项占位符。项占位符控件还必须指定 runat="server"。】， 如何在 ListView“ListView1”上指定项占位符？

堆栈跟踪:
[InvalidOperationException: 必须在 ListView“ListView1”上指定项占位符。可通过将控件的 ID 的属性设置为“itemPlaceholder”来指定项占位符。项占位符控件还必须指定 runat="server"。]
   System.Web.UI.WebControls.ListView.GetPreparedContainerInfo(Control outerContainer, Boolean isItem, Int32& placeholderIndex) +249
   System.Web.UI.WebControls.ListView.CreateItemsWithoutGroups(ListViewPagedDataSource dataSource, Boolean dataBinding, InsertItemPosition insertPosition, ArrayList keyArray) +59
   System.Web.UI.WebControls.ListView.CreateChildControls(IEnumerable dataSource, Boolean dataBinding) +693
   System.Web.UI.WebControls.ListView.PerformDataBinding(IEnumerable data) +32
   System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +111
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +29
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +149
   System.Web.UI.WebControls.ListView.PerformSelect() +56
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +70
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +82
   System.Web.UI.WebControls.ListView.CreateChildControls() +53
   System.Web.UI.Control.EnsureChildControls() +87
   System.Web.UI.Control.PreRenderRecursiveInternal() +41
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360

[ 本帖最后由 beidoujs 于 2011-4-2 22:27 编辑 ]

怎么没人知道呢？