如何找到没有的RowDataBound在GridView ItemTemplate中一个DropDownList？ [英] How to find a DropDownList in a GridView ItemTemplate without RowDataBound?

问题描述

我有一个DropDownList的GridView的外面，我有一个GridView的一个ItemTemplate里面一个DropDownList。这是外DropDownList中有一个SelectedIndex_Changed事件和火灾时，应填充GridView控件内的DropDownList。问题是，在我用填充内DropDownList的方法，它不能找到控制：下面是示例code，当外界的DropDownList改变被称为：

  //不找ddlRoom
 DropDownList的ddlRoom =（DropDownList的）gv.TemplateControl.FindControl（ddlRoom）;
    如果（rows.Count（）大于0）
    {        VAR房= rows.CopyToDataTable（）;
        ddlRoom.Items.Clear（）;
        ddlRoom.Items.Add（新的ListItem（选择...， -  1））;
        ddlRoom.DataSource =室;
        ddlRoom.DataBind（）;
    }
 

我也尝试：

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

解决方案

您需要绑定的下拉列表中的每一行。尝试这样的事情

  DropDownList的ddlRoom = NULL;
的foreach（在gv.Rows VAR gridRow）
{
    ddlRoom = gridRow.FindControl（ddlRoom）作为DropDownList的;
    如果（ddlRoom！= NULL）
    {
        //你的code在这里
    }
}
 

I have a DropDownList outside of a GridView and I have a DropDownList inside an ItemTemplate of a GridView. The DropDownList that is outside has a SelectedIndex_Changed event and when that fires, it should populate the DropDownList inside the GridView. The problem is that in the method that I use to populate the inside DropDownList, it can't find the control: Here is sample code that is called when the outside DropDownList is changed:

 //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();
    }

I have also tried:

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

解决方案

You'll need to bound the dropdown for each row. Try something like this

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

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