在DataGrid中使用DropDownList（原创）

  B/S架构的MIS中，在DataGrid中使用DropDownList是很常见的事情
Html代码如下：

<asp:TemplateColumn HeaderText="细目">

       <HeaderStyle Width="15%"></HeaderStyle>

              <ItemTemplate>

                     <asp:Label Runat=server Text='<%#DataBinder.Eval(Container, "DataItem.TicketType")%>'></asp:Label>

              </ItemTemplate>

       <EditItemTemplate>

                     <asp:DropDownList id="ddl_Detail" runat="server" Width="100%">

                            <asp:ListItem Value="Train">火车票</asp:ListItem>                                                 <asp:ListItem Value="Air">机票</asp:ListItem>

                            <asp:ListItem Value="Taxi">计程车费</asp:ListItem>

                            <asp:ListItem Value="Bus">公共汽车费</asp:ListItem>

                            <asp:ListItem Value="Book">订票费</asp:ListItem>

                            <asp:ListItem Value="Other">其它</asp:ListItem>

                     </asp:DropDownList>

                     <asp:Label Runat=server ID=lbl_Detail Text='<%#DataBinder.Eval(Container, "DataItem.TicketType")%>' Visible=False></asp:Label>

       </EditItemTemplate>

</asp:TemplateColumn>

       <asp:TemplateColumn HeaderText="来程/去程">

         <HeaderStyle Width="15%"></HeaderStyle>

           <ItemTemplate>

                <asp:Label Runat=server Text='<%#DataBinder.Eval(Container, "DataItem.ComeOrBack")%>'></asp:Label>

              </ItemTemplate>

       <EditItemTemplate>

              <asp:DropDownList id="ddl_ComeOrBack" runat="server" Width="100%">

                     <asp:ListItem Value="Come">来程</asp:ListItem>

                     <asp:ListItem Value="Back">去程</asp:ListItem>

              </asp:DropDownList>

              <asp:Label Runat=server ID="lbl_ComeOrBack" Text='<%#DataBinder.Eval(Container, "DataItem.ComeOrBack")%>' Visible=False></asp:Label>

       </EditItemTemplate>

</asp:TemplateColumn>

这个DataGrid的第一个Column是编辑列,DropDownList放在EditItemTemplate里，点击“修改”，问题出现了，修改前的细目是“计程车票”，点击“编辑”后，如何使ddl的index还保持在继承车票上呢？C#代码如下：

private void dg_Detail_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)

         {

              if( e.Item.ItemType == ListItemType.EditItem )//判断是否是EditItemTemplate

              {

                   DropDownList ddl_Detail = (DropDownList)e.Item.FindControl("ddl_Detail");

                   DropDownList ddl_ComeOrBack = (DropDownList)e.Item.FindControl("ddl_ComeOrBack");

                   Label lbl_Detail = (Label)e.Item.FindControl("lbl_Detail");

                   Label lbl_ComeOrBack = (Label)e.Item.FindControl("lbl_ComeOrBack");

 

                   string str1 = lbl_Detail.Text;

                   string str2 = lbl_ComeOrBack.Text;

                   ddl_Detail.SelectedIndex = ddl_Detail.Items.IndexOf( ddl_Detail.Items.FindByText(str1) );               ddl_ComeOrBack.SelectedIndex = ddl_ComeOrBack.Items.IndexOf( ddl_ComeOrBack.Items.FindByText(str2) );//这里的代码就是为了设置ddl的索引

              }        

         }

 OK啦!