EditItemTemplate DropDownList绑定数据

Question

page_load(){
ViewState["commtype"] = db.getData();
}                  <EditItemTemplate>
                                类型:<asp:DropDownList ID="drowdownlist" runat="server" DataSource='<%# (DataTable)ViewState["commtype"] %>'
                                    SelectedValue='<%# Eval("id") %>' DataTextField="title" 
                                    DataValueField="id"  />
                            </EditItemTemplate>这样无法绑定到数据到列表上
并且,我需要点击两次"编辑"才会显示编辑框,为什么呢?
我已经在
   protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;    }
如果这样写,就需要点击两次才显示
如果
 protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
GridView1.DataBind();
    }
这样写,就会显示空白的gridview

Answer 1

<ItemTemplate> 
<asp:DropDownList ID="ddlSort" runat="server" Width="98%">
  </asp:DropDownList>
 <asp:HiddenField ID="Hd_Sort" runat="server" Value='<%# Eval("BalSort")%>' />
</ItemTemplate>
if(!IsPostBack)BindData();
 protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
  {
  if (e.Row.RowIndex != -1)
  { if (e.Row.RowState == DataControlRowState.Edit || e.Row.RowState == (DataControlRowState.Alternate | DataControlRowState.Edit))
  {
  ((DropDownList)e.Row.FindControl("ddlSort")).SelectedValue = ((HiddenField)e.Row.FindControl("Hd_Sort")).Value;
  }
  }
  } protected void gv_RowEditing(object sender, GridViewEditEventArgs e)
  {
  gv.EditIndex = e.NewEditIndex;
  string strSort = ((DropDownList)gv.Rows[e.NewEditIndex].FindControl("ddlSort")).SelectedValue.Trim();
  gv.EditIndex = -1;
  BindData();
  } 

Answer 2

 protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
  {
  GridView1.EditIndex = e.NewEditIndex;
   获取数据绑定GRIDVIEW的方法，而不是GridView1.DataBind();
  }