C# 如何在GridView DropDownList中维护所选项目

我的问题是，在gridview\u行编辑事件之后，我无法在gridview中保留该项

 <asp:TemplateField HeaderStyle-CssClass="gridHeading" HeaderText="Get Alerts By SMS"
                                ItemStyle-CssClass="gridValue" ItemStyle-HorizontalAlign="Center">
         <ItemTemplate>
                 <asp:Label ID="lblAlertBySMSGeofence" runat="server" Text=' <%# (Convert.ToBoolean(Convert.ToInt32(Eval("alertBySMS")))) ? "Yes" : "No" %>'></asp:Label>
         </ItemTemplate>
         <EditItemTemplate>
              <asp:DropDownList ID="ddlAlertBySMSGeofence" runat="server" AppendDataBoundItems="true"
                                        CssClass="gridValue">
                                        <asp:ListItem Text="Yes" Value="1"/>
                                        <asp:ListItem Text="No" Value="0" />
                                    </asp:DropDownList>
                                </EditItemTemplate>
                                <HeaderStyle CssClass="gridHeading" />
                                <ItemStyle CssClass="gridValue" HorizontalAlign="Center" />
 </asp:TemplateField>

编辑

    protected void grdGeofence_RowEditing(object sender, GridViewEditEventArgs e)
    {

        GridViewRow row = (GridViewRow)grdGeofence.Rows[e.NewEditIndex];
        grdGeofence.EditIndex = e.NewEditIndex;
        List<COMMONGeofenceAlert> geofenceData = new BLsmsalertdetail().getGeofencealertDetail(Session["sessaccountid"].ToString(), txtdeviceID.Text);
        for (int y = 0; y < geofenceData.Count; y++)
        {
            geofenceData[y].vehicleNumber = ddlVehicleNumber.SelectedItem.Text;
        }
        grdGeofence.DataSource = geofenceData;
        grdGeofence.DataBind();
    }

protected void grdGeofence_RowUpdating(object sender, GridViewUpdateEventArgs e)
 {
    GridViewRow row = (GridViewRow)grdGeofence.Rows[e.RowIndex];

    string id = grdGeofence.DataKeys[e.RowIndex].Value.ToString();

    Label lblVehicle = (Label)row.FindControl("lblVehicleGeofence");
    TextBox mobileNumber = (TextBox)row.FindControl("txtMobileGeofence");
    TextBox EmailID = (TextBox)row.FindControl("txtEmailGeofence");
    DropDownList ddlAlertBySMS = (DropDownList)row.FindControl("ddlAlertBySMSGeofence");
    DropDownList ddlAlertbyEmail = (DropDownList)row.FindControl("ddlAlertByeEmailGeofence");
    DropDownList AlertAtGeofenceEnter = (DropDownList)row.FindControl("ddlAlertGeofenceEnter");
    DropDownList alertAtGeofenceExit = (DropDownList)row.FindControl("ddlAlertGeofenceExit");
    DropDownList ddlAddress = (DropDownList)row.FindControl("ddlGeofenceAddressGrid");
    BLsmsalertdetail detail = new BLsmsalertdetail();

    int i = updateGeofence(id, mobileNumber.Text, EmailID.Text, ddlAlertBySMS.SelectedItem.Value, ddlAlertbyEmail.SelectedItem.Value, AlertAtGeofenceEnter.SelectedItem.Value, alertAtGeofenceExit.SelectedItem.Value, ddlAddress.SelectedItem.Text);
    if (i == 1)
    {
        ScriptManager.RegisterClientScriptBlock(this.Page, typeof(Page), Guid.NewGuid().ToString(), "alert('Success!!')", true);
    }
    else
    {
        ScriptManager.RegisterClientScriptBlock(this.Page, typeof(Page), Guid.NewGuid().ToString(), "alert('Error!! Could not Update the value.')", true);
        }

        grdGeofence.EditIndex = -1;
        List<COMMONGeofenceAlert> geofenceData = new BLsmsalertdetail().getGeofencealertDetail(Session["sessaccountid"].ToString(), txtdeviceID.Text);
        for (int y = 0; y < geofenceData.Count; y++)
        {
            geofenceData[y].vehicleNumber = ddlVehicleNumber.SelectedItem.Text;
        }
        grdGeofence.DataSource = geofenceData;
        grdGeofence.DataBind();
}

protected void grdGeofence_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (grdGeofence.EditIndex == e.Row.RowIndex && e.Row.RowType == DataControlRowType.DataRow)
        {
            DropDownList ddlAddress = (DropDownList)e.Row.Cells[0].FindControl("ddlGeofenceAddressGrid");
            List<COMMONsmsalertdetail> getSmsDispatcherData = new BLsmsalertdetail().getSMSalertDetail(Session["sessaccountid"].ToString());

            for (int i = 0; i < getSmsDispatcherData.Count; i++)
            {
                ddlAddress.Items.Add(new ListItem(getSmsDispatcherData[i].place, getSmsDispatcherData[i].place));
       }
            //ddlAddress.DataSource = getSmsDispatcherData;
            //ddlAddress.DataTextField = "place";
            //ddlAddress.DataValueField = "place";
            //ddlAddress.DataBind();
        }
    }

受保护的无效grdGeofence\u行编辑（对象发送方，GridViewEditEventArgs e）
{
GridViewRow行=（GridViewRow）grdGeofence.Rows[e.NewEditIndex]；
grdGeofence.EditIndex=e.NewEditIndex；
List geofenginedata=new blsmsalertdail（）.getgeofenginealertdetail（会话[“sessaccountid”].ToString（），txtdeviceID.Text）；
对于（int y=0；y

数据库根据情况返回0/1，我使用布尔表达式将其转换为Yes和No

我想将“lblalertbyssgeofence”的值保留为dropdownlist

“ddlalertbysmgeofence”

我看过很多网站的很多解决方案，包括SO。但是这个方法太长，也不符合我的情况。 我有大约100个下拉列表，我不能一次又一次地重写代码

---

有没有更简单的方法呢？

为

下拉列表添加属性
SelectedValue=''
。查看链接了解更多详细信息

<EditItemTemplate>
  <asp:DropDownList ID="ddlAlertBySMSGeofence" runat="server"
      AppendDataBoundItems="true" SelectedValue='<%#Eval("alertBySMS")%>'  
      CssClass="gridValue">
         <asp:ListItem Text="Yes" Value="1" />
         <asp:ListItem Text="No" Value="0" />
</asp:DropDownList>


在行数据绑定上，u可以执行此操作……但如果前端更改为u，以启用ddl的自动回写True并再次绑定网格视图，我可以执行此操作吗？在行编辑。。标签丢失，我无法检索其值。请尝试在gridview的
RowDataBound
事件中设置下拉列表的值。@techdo用于每个下拉列表。。我是说100个下拉列表？为什么gridview绑定在事件
grdGeofence\u行编辑中进行？是否有必要？选项所选值不可用。。看这个，这不是问题。。。默认情况下它不会出现。您只需添加该属性并进行检查。非常感谢您。。！！如果我能给你100+甜蜜的上帝之母。。！你让它变得如此简单。。！再次非常感谢。！我被卡住了。。