Question

dropdwnlist autopostback不能正常工作我的代码如下：

<asp:DropDownList ID="ddlState" runat="server" Width="200px" AutoPostBack="true" onselectedindexchanged="ddlState_SelectedIndexChanged" >
   <%--  <asp:ListItem Selected="True">--Select--</asp:ListItem>--%>
</asp:DropDownList>

Codebehind是：

protected void ddlState_SelectedIndexChanged(object sender, EventArgs e)
{
    ddlDistrict.Enabled = true;
    ddlTaluka.Enabled = true;
    DataTable dtObj = new DataTable();
    using (var client = ServiceClient<IPallaviAddressManager>.Create("PallaviAddressManager"))
    {
        dtObj = client.Instance.GetAllStates();
    }
    var result = (from dt in dtObj.AsEnumerable()
                      where dt.Field<Int64>("StateID") == Convert.ToInt64(ddlState.SelectedValue)
                      select dt);
    dtObj = result.CopyToDataTable();
    ddlDistrict.DataSource = dtObj;
    ddlState.DataTextField = "Description";
    ddlState.DataValueField = "DistrictID";
}

你能帮忙吗？

Answer 1

将其设为runat="server"和autopostback="true"

Answer 2

尝试添加ddlDistrict.DataBind（）;在代码的最后，正如Shadow Wizard建议的那样

Answer 3

听起来事件没有被正确连接。

尝试在设计器中选择DropDownList控件，转到属性选项卡并双击SelectedIndexChanged事件右侧的空间，如果它在代码隐藏中创建了新的存根，则原始事件未被挂钩正常。

dropdownlist autopostback不工作

3 个答案: