DataGrid 在 EditItemTemplate时 DropDownList 如何让默认选项=Label1的值

Question

private void WorkList_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{

    WorkList.EditItemIndex = e.Item.ItemIndex;
              BindGrid();

}<asp:TemplateColumn HeaderText="信息类型">
<ItemTemplate>
<asp:Label id=Label1 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.areaname") %>'>
</asp:Label>
</ItemTemplate>
<DropDownList >
<asp:DropDownList id=housetype runat="server" Width="107px" DataValueField="areaname" DataTextField="areaname" DataSource="<%# BindThehousetype(4) %>">
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>
public SqlDataReader BindThehousetype(int typeid)
{

SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["fc"].ToString());
SqlCommand cmd =new SqlCommand("select areaname,id from area where typeid="+typeid+"", conn);
conn.Open();
return cmd.ExecuteReader(CommandBehavior.CloseConnection);
}

Answer 1

private void dlResourcesOut_ItemDataBound(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)
        {
            if(e.Item.ItemIndex>-1)
            {
                ListItem tmp = ((DropDownList)e.Item.FindControl("housetype")).FindByValue(((Label)e.Item.FindControl("Label1")).Text);
               if(tmp!=null)tmp.Selected = true;
            }
        }

Answer 2

private void WorkList_ItemDataBound(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)
        {
            if(e.Item.ItemIndex>-1)
            {
                ListItem tmp = ((DropDownList)e.Item.FindControl("housetype")).FindByValue(((Label)e.Item.FindControl("Label1")).Text);
               if(tmp!=null)tmp.Selected = true;
            }
        }

Answer 3

E:\website\zh\shangpinf\houseInfo.aspx.cs(300): “System.Web.UI.WebControls.DropDownList”并不包含对“FindByValue”的定义

Answer 4

这样写时
ListItem tmp = ((DropDownList)e.Item.FindControl("housetype")).Items.FindByValue(((Label)e.Item.FindControl("Label1")).Text);未将对象引用设置到对象的实例。