ASCX 文件:
<asp:datagrid runat="server" id="gridFormFields" datakeyfield="FieldID"
autogeneratecolumns="False"
onitemcommand="gridFormFields_ItemCommand" onitemdatabound="gridFormFields_ItemDataBound">
<columns>
<asp:templatecolumn>
<itemtemplate>
<asp:imagebutton runat="server" id="buttonMoveUpFormField" resourcekey="buttonMoveUpFormField"
commandname="Item" commandargument="MoveUp" imageurl="~/images/up.gif" />
</itemtemplate>
</asp:templatecolumn>
<asp:templatecolumn>
<itemtemplate>
<asp:imagebutton runat="server" id="buttonMoveDownFormField" resourcekey="buttonMoveDownFormField"
commandname="Item" commandargument="MoveDown" imageurl="~/images/dn.gif" />
</itemtemplate>
</asp:templatecolumn>
</columns>
后面的代码:
protected void gridFormFields_ItemDataBound(object sender, DataGridItemEventArgs e)
{
(e.Item.FindControl("buttonMoveUpFormField") as ImageButton)
.Visible = gridFormFields.Items.Count > 1 && e.Item.ItemIndex > 0;
(e.Item.FindControl("buttonMoveDownFormField") as ImageButton)
.Visible = gridFormFields.Items.Count > 1 && e.Item.ItemIndex < gridFormFields.Items.Count - 1;
}
在后面的代码中,FindControl 返回的 Control 是 null。为什么?
如何访问 buttonMoveUpFormField 和 buttonMoveDownFormField 控件?
从后面的代码中,是否可以访问在 DataGrid 的 TemplateColumn 部分的 ItemTemplate 部分中声明的控件?