为什么在更新面板中找不到控件

本文关键字:找不到 控件 更新 为什么 | 更新日期: 2023-09-27 17:50:19

我在GridView中有一个按钮。

当我运行页面时,我得到以下错误:

A control with ID 'btnShowDepend' could not be found for the trigger in UpdatePanel 'TasksUpdatePanel'.

如何解决这个问题

为什么在更新面板中找不到控件

Button btnShowDepend=(Button)TasksUpdatePanel.FindControl("btnShowDepend");

请使用

或者你可以把btnShowDepend放在updatepanel

之外

ContentTemplate中再添加一个updatepanel

		<asp:UpdatePanel ID="updButton" runat="server" UpdateMode="Conditional">
  <asp:ImageButton ID="btnShowDepend" runat="server" OnCommand="btnShowDepend_Command" />
</ContentTemplate>

你需要注册图像按钮作为AsyncPostbackTrigger

试试RowDataBound

protected void yourTasksGV_RowDataBound(object sender, GridViewRowEventArgs 
{  
  if(e.Row.RowType == DataControlRowType.DataRow)
  {
   ImageButton ib = e.Row.FindControl("btnShowDepend") as ImageButton;  
   ScriptManager.GetCurrent(this).RegisterAsyncPostBackControl(ib);  
  }  
}
 

你最好在RowDataBound事件中添加异步触发器:

void yourTasksGV_RowDataBound(Object sender, GridViewRowEventArgs e)
{
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
        ImageButton ib = e.Row.FindControl("btnShowDepend") as ImageButton;
        if (ib != null)
        {
            AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
            trigger.ControlID = ib.UniqueID;
            trigger.EventName = "Click";
            TasksUpdatePanel.Triggers.Add(trigger);
        }
    }
}