无法显示下拉列表的正确值

本文介绍了无法显示下拉列表的正确值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 限时删除！！ 您好， 我的网格包含3个字段：CityID，BranchID和Edit链接。 当我点击编辑链接时，会显示一个带有正确编辑项目的Web用户控制页面addFacilty.ascx。 addFacilty.ascx包括2个下拉列表ddlCity和ddlBranch以及2个文本框cityid和branchid 我希望下拉列表包含结果： 1-ddlcity：具有id的城市：cityid.text.tostring（） 2-ddlbranch：具有id的分支：branchid.text.tostring（）; 请注意，cityid和branchid是两个文本框，Text值绑定到grid。所以它是自动填充的。 我现在的问题是当我点击网格的编辑链接时。 webUser控制页面的cityid和branchid显示正确的项目。但是当我想使用它们的值时，cityid和branchid被视为空的。 下面是addFacilty.ascx的代码：Hello,I have a grid that contains 3 fields: CityID, BranchID and Edit link.When i click on the edit link, a web user control page "addFacilty.ascx" is displayed with the right edited items."addFacilty.ascx" include 2 dropdown lists ddlCity and ddlBranch and 2 textboxes cityid and branchidI want that the dropdownlists contain as result:1-ddlcity: the city having id: cityid.text.tostring()2-ddlbranch: the branch having id : branchid.text.tostring();Note that cityid and branchid are two textboxes with Text value is bind to grid. so it is automaically filled.My problem now is that when i click on edit link of the grid. cityid and branchid of the webUser control page displays the right item. but when i want to use their values, cityid and branchid are treated as if they are empty.below is the code of "addFacilty.ascx": <asp:DropDownList ID="ddlCity" runat="server" DataSourceID="tblCity" DataTextField="city" DataValueField="cityID" AutoPostBack="true" SelectedValueField='<%#DataBinder.Eval( Container, "DataItem.cityID") %>'> </asp:DropDownList> <asp:SqlDataSource ID="tblCity" runat="server" ConnectionString="<% $ ConnectionStrings:SmartBookingEngineConn %>" SelectCommand="select cityID,city from viewCityAdmin"></asp:SqlDataSource><asp:DropDownList ID="ddlBranch" runat="server" DataSourceID="tblBranch" DataTextField="Branch" DataValueField="BranchID"> </asp:DropDownList> <asp:SqlDataSource ID="tblBranch" runat="server" ConnectionString="<%$ ConnectionStrings:SmartBookingEngineConn %>" SelectCommand="SELECT [BranchID],[Branch] FROM [tblBranch] WHERE ([CityID]=@cityID)"> <SelectParameters> <asp:ControlParameter Name="cityID" ControlID="ddlCity" PropertyName="SelectedValue" Type="String" /> </SelectParameters> </asp:SqlDataSource><telerik:RadTextBox ID="cityid" runat="server" Height="28px" Visible="true" Text='<%# DataBinder.Eval( Container, "DataItem.cityID" ) %>' > </telerik:RadTextBox> <telerik:RadTextBox ID="branchid" runat="server" Height="28px" Visible="true" Text='<%# DataBinder.Eval( Container, "DataItem.BranchID")%>' AutoPostBack="true"> </telerik:RadTextBox> *** addFacilty.ascx.cs：***addFacilty.ascx.cs:protected void Page_Load(object sender, EventArgs e){if (cityid.Text.ToString() != "" && branchid.Text.ToString() !=""){string selectedIDCity = cityid.Text.ToString();tblCity.SelectCommand = "Select * from viewCityAdmin where cityID=@cityid";tblCity.SelectParameters.Clear();tblCity.SelectParameters.Add("cityid", selectedIDCity);tblCity.DataBind();string selectedIDBranch = branchid.Text.ToString();tblBranch.SelectCommand = "Select * from tblBranch where BranchID=@branchid";tblBranch.SelectParameters.Clear();tblBranch.SelectParameters.Add("branchid", selectedIDBranch);tblBranch.DataBind();}} 提前谢谢。thank you in advance.推荐答案 *** addFacilty.ascx.cs：***addFacilty.ascx.cs:protected void Page_Load(object sender, EventArgs e){if (cityid.Text.ToString() != "" && branchid.Text.ToString() !=""){string selectedIDCity = cityid.Text.ToString();tblCity.SelectCommand = "Select * from viewCityAdmin where cityID=@cityid";tblCity.SelectParameters.Clear();tblCity.SelectParameters.Add("cityid", selectedIDCity);tblCity.DataBind();string selectedIDBranch = branchid.Text.ToString();tblBranch.SelectCommand = "Select * from tblBranch where BranchID=@branchid";tblBranch.SelectParameters.Clear();tblBranch.SelectParameters.Add("branchid", selectedIDBranch);tblBranch.DataBind();}} 提前谢谢。thank you in advance.protected void Page_Load(object sender, EventArgs e){if (cityid.Text.ToString() != "" && branchid.Text.ToString() !=""){string selectedIDCity = cityid.Text.ToString();tblCity.SelectCommand = "Select * from viewCityAdmin where cityID="+ selectedIDCity ;tblCity.SelectParameters.Clear();tblCity.SelectParameters.Add("cityid", selectedIDCity);tblCity.DataBind();string selectedIDBranch = branchid.Text.ToString();tblBranch.SelectCommand = "Select * from tblBranch where BranchID="+ selectedIDBranch ;tblBranch.SelectParameters.Clear();tblBranch.SelectParameters.Add("branchid", selectedIDBranch);tblBranch.DataBind();}} 这可能有用。 试一试。 谢谢This may work.Try this out.Thanks 这篇关于无法显示下拉列表的正确值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 1403页，肝出来的..