GridView中RowEditing中如何实例化DropDownList?

Question

在编辑RowEditing中如何实例化DropDownList?
 直接写
DropDownList ddl=(DropDownList)GridView1.FindControl("DropDownList1");DropDownList DDL1 = (DropDownList)GVW_ShowCard.Rows[e.NewEditIndex].Cells[5].FindControl("DropDownList1");
上面二种写法都不行,但是下面却能取到相应的值,为什么啊?
string strValue = ((HtmlInputHidden)GVW_ShowCard.Rows[e.NewEditIndex].Cells[2].FindControl("Hid1")).Value;
大家是如何写的呢？帮小弟一下吧,谢谢了!:)

Answer 1

DropDownList只是在EditItemTemplate中存在的,在ItemTemplate中只是一个Lable,是不是这个原因才为出错呢?向各位大侠请教了!~~

Answer 2

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridViewRow gvr = GridView1.Rows[e.NewEditIndex];
DropDownList ddl = (DropDownList)gvr.Cells[你DropDownList放在列的索引].Controls[0];
string str=ddl.SelectItem.Text;
}
//Controls[0]代表单元格中的控件的索引，0代表第一个控件

Answer 3

谢谢LS的了,照楼上写的出了一点问题:无法将类型为“System.Web.UI.LiteralControl”的对象强制转换为类型“System.Web.UI.WebControls.DropDownList”。  protected void GVW_ShowCard_RowEditing(object sender, GridViewEditEventArgs e)
    {
        
        GVW_ShowCard.EditIndex = e.NewEditIndex;
        GridViewRow grv = GVW_ShowCard.Rows[e.NewEditIndex];
        DropDownList DDL1 = (DropDownList)grv.Cells[5].Controls[0];//提示这里出错
        DDL1.Items.Add(new ListItem("EMS", "1"));//想从表中读取想应的值赋给它
        BindCard();
    }想用户点击编辑后在RowEditing中取得相应ID值，在数据库中查找相应的值然后给DropDownList赋值，这种如何做的呢？虚心请教了:!)

Answer 4

参考以下代码:    protected void ddlDispOrder_DataBound(object sender, EventArgs e)
    {
        DropDownList ddl = (DropDownList)sender;
        for (int i=0; i<= 999; i++)
        {
            ddl.Items.Add(new ListItem(i.ToString(), i.ToString()));
        }
        GridViewRow det = (GridViewRow)ddl.NamingContainer;
        ddl.SelectedValue = ((DataRowView)det.DataItem)["DispOrder"].ToString();
    }
    protected void gvResume_JobList_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
       if (Page.IsValid)
      {
            string strDispOrder = ((DropDownList)((GridView)sender).Rows[e.RowIndex].FindControl("ddlDispOrder")).SelectedValue;
            e.NewValues["DispOrder"] = strDispOrder;
     }
    }

Answer 5

不好意思 失误！ 应该是写在更新事件中：
protected void GridView3_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
  GridViewRow gvr = GridView3.Rows[e.RowIndex];
        Button btn = (Button)gvr.Cells[2].FindControl("Button2");
        string str=btn.Text;
        Response.Write(str);
}

Answer 6

实例化应该写在RowDataBound事件里而不是RowEditing事件里吧
  if (((DropDownList)e.Row.FindControl("ddlLb")) != null)
        {
            DropDownList ddlLb = (DropDownList)e.Row.FindControl("ddlLb");
            dbm_lb_dal dallb = new dbm_lb_dal();
            DataTable dtLb;
            dtLb = dallb.GetList("");
            ddlLb.Items.Clear();
            ddlLb.DataSource = dtLb;
            ddlLb.DataTextField = "LBMC";
            ddlLb.DataValueField = "LBID";
            ddlLb.DataBind();
            ddlLb.Items.Insert(0, new ListItem("", ""));
            ddlLb.Items.FindByText(dtLb.Rows[0]["LBMC"].ToString()).Selected = true;
           
            dtLb = null;
            dallb = null;
           
        }在RowUpdating事件里取值
  string Lbmc = ((DropDownList)gdvXl.Rows[e.RowIndex].FindControl("ddlLb")).SelectedItem.Text;

Answer 7

同意zwwlovezy1(Eminem)
editing和updating不是一样的哦，前者是编辑状态的激活，后者是编辑确认即更新数据

Answer 8

谢谢大家，我已改到RowDataBound里面了，可以了,再一次谢谢
看来在RowEditing真不好取值啊,hehe

Answer 9

在ShowCard_RowEditing事件中可以取值
DropDownList ddl=(DropDownList)grdType.Rows[e.NewEditIndex].FindControl("DropDownList1");
string ddlValue= ddl.SelectedValue.ToString().Trim();