如何在沒有RowDataBound的GridView ItemTemplate中查找DropDownList？

Question

我有一個DropDownList的GridView外，我有一個DropDownList內的GridView的ItemTemplate。外面的DropDownList有一個SelectedIndex_Changed事件，當它觸發時，它應該在GridView中填充DropDownList。問題是，在我使用填充內DropDownList的方法，它無法找到控制：這是調用的時候，外面的DropDownList改變示例代碼：

//Does not find ddlRoom 
DropDownList ddlRoom = (DropDownList)gv.TemplateControl.FindControl("ddlRoom"); 
    if (rows.Count() > 0) 
    { 

     var rooms = rows.CopyToDataTable(); 
     ddlRoom.Items.Clear(); 
     ddlRoom.Items.Add(new ListItem("Select...", "-1")); 
     ddlRoom.DataSource = rooms; 
     ddlRoom.DataBind(); 
    } 

我也曾嘗試：

DropDownList ddlRoom = (DropDownList)gv.FindControl("ddlRoom"); 

Answer 1

您需要爲每一行綁定下拉菜單。嘗試像這樣

DropDownList ddlRoom = null; 
foreach(var gridRow in gv.Rows) 
{ 
    ddlRoom = gridRow.FindControl("ddlRoom") as DropDownList; 
    if (ddlRoom != null) 
    { 
     //your code here 
    } 
}