HOW TO：使用嵌套 Repeater 控件和 Visual C# .Net 显示分层数据

绑定到父表启动 Microsoft Visual Studio .NET。在文件菜单上，指向新建，然后单击项目。单击项目类型下的 Visual C# 项目，然后单击模板下面的"ASP.NET Web 应用程序"。在位置框中，删除 WebApplication # ，然后键入 NestedRepeater。如果您使用的是本地服务器，请保留服务器名称 https://localhost 不变。下列路径将显示在位置框中：https://localhost/ NestedRepeater单击确定。在解决方案资源管理器中，右键单击 NestedRepeater 项目名称节点，指向添加，然后单击添加 Web 窗体。若要重命名 Web 窗体，请键入 NestedRepeater，然后单击打开。创建了新的 Web 窗体。它将在 Microsoft Visual Studio .NET 集成开发环境 (IDE) 的设计视图中打开。从工具箱，选择 Repeater 控件，然后将其拖到 Web 窗体页面。将此 Repeater 控件的 ID 属性更改为"parentRepeater"。切换到 Web 窗体的 HTML 视图。为此，请单击设计器左下角的 HTML 选项卡。Repeater 控件将生成下列 HTML 代码： <asp:Repeater id="parentRepeater" runat="server"></asp:Repeater>控件将生成下列 HTML 代码：在 Repeater 标记中添加下列代码： <itemtemplate><b><%# DataBinder.Eval(Container.DataItem, "au_id") %></b><br></itemtemplate>完成之后，Repeater 的 HTML 代码将如下所示： <asp:Repeater id="parentRepeater" runat="server"><itemtemplate> <b><%# DataBinder.Eval(Container.DataItem, "au_id") %></b><br></itemtemplate></asp:Repeater>控件将生成下列 HTML 代码：在"解决方案资源管理器"中，右键单击 NestedRepeater.aspx，然后单击查看代码切换到 NestedRepeater.aspx.cs 代码隐藏文件。控件将生成下列 HTML 代码：将下面的名称空间声明添加到该文件的顶端： using System.Data;using System.Data.SqlClient;控件将生成下列 HTML 代码：向 Page_Load 事件添加下列代码以创建到 Pubs 数据库的连接，然后将 Authors 表绑定到 Repeater 控件： public void Page_Load(object sender, EventArgs e) {//Create the connection and DataAdapter for the Authors table.SqlConnection cnn = new SqlConnection("server=(local);database=pubs; Integrated Security=SSPI");SqlDataAdapter cmd1 = new SqlDataAdapter("select * from authors",cnn);//Create and fill the DataSet.DataSet ds = new DataSet();cmd1.Fill(ds,"authors");//Insert code in step 4 of the next section here.//Bind the Authors table to the parent Repeater control, and call DataBind.parentRepeater.DataSource = ds.Tables["authors"];Page.DataBind();//Close the connection.cnn.Close(); }备注：您可能必须修改数据库连接字符串，使其适合于您的环境。控件将生成下列 HTML 代码：保存所有文件。控件将生成下列 HTML 代码：在生成菜单上，单击生成解决方案以编译该项目。控件将生成下列 HTML 代码：在浏览器中查看 .aspx 页，并验证该页至今还在工作。输出应为如下所示： 172-32-1176 213-46-8915 238-95-7766 267-41-2394 ... 回到顶端绑定到子表在 NestedRepeater.aspx 页的 HTML 视图中，找到下列代码行： <b><%# DataBinder.Eval(Container.DataItem, "au_id") %></b><br>在上述代码之后添加以下代码： <asp:repeater id="childRepeater" runat="server"><itemtemplate> <%# DataBinder.Eval(Container.DataItem, "[/"title_id/"]")%><br></itemtemplate></asp:repeater>此新代码将第二个 Repeater 控件添加到父 Repeater 控件的 ItemTemplate 属性。设置子 Repeater 控件的 DataSource 属性，如下所示： <asp:repeater ... datasource='<%# ((DataRowView)Container.DataItem).Row.GetChildRows("myrelation") %>'>设置了子 Repeater 控件的 DataSource 属性之后，两个 Repeater 控件（父和子）的 HTML 代码如下所示： <asp:Repeater id="parentRepeater" runat="server"><itemtemplate>"b"; <%# DataBinder.Eval(Container.DataItem, "au_id") %></b><br><asp:repeater id="childRepeater" runat="server">datasource='<%# ((DataRowView)Container.DataItem).Row.GetChildRows("myrelation") %>' ><itemtemplate><%# DataBinder.Eval(Container.DataItem, "[/"title_id/"]")%><br></itemtemplate></asp:Repeater></itemtemplate></asp:Repeater>设置了子将下面的页指令添加到该页的顶端： <%@ Import Namespace="System.Data" %>设置了子在代码隐藏页中，将 Page_Load 事件中的下列行： //Insert code in step 4 of the next section here.替换为以下代码： //Create a second DataAdapter for the Titles table.SqlDataAdapter cmd2 = new SqlDataAdapter("select * from titleauthor",cnn);cmd2.Fill(ds,"titles");//Create the relation bewtween the Authors and Titles tables.ds.Relations.Add("myrelation",ds.Tables["authors"].Columns["au_id"],ds.Tables["titles"].Columns["au_id"]);这样会将 Titles 表添加到 DataSet，然后添加 Authors 表和 Titles 表之间的关系。设置了子保存并编译该应用程序。设置了子在浏览器中查看该页，并验证该页至今还在工作。输出应为如下所示：172-32-1176 PS3333 213-46-8915 BU1032 BU2075 238-95-7766 PC1035 267-41-2394 BU1111 TC7777 ... 回到顶端完整代码列表 Nestedrepeater.aspx<%@ Page language="c#" Codebehind="NestedRepeater.aspx.cs" AutoEventWireup="false" Inherits="NestedRepeater.NestedRepeater" %><%@ Import Namespace="System.Data" %><html><body><form runat=server><asp:repeater id="parentRepeater" runat="server"><itemtemplate><b><%# DataBinder.Eval(Container.DataItem,"au_id") %></b><br><asp:repeater id="childRepeater" datasource='<%# ((DataRowView)Container.DataItem).Row.GetChildRows("myrelation") %>' runat="server"><itemtemplate><%# DataBinder.Eval(Container.DataItem, "[/"title_id/"]")%><br></itemtemplate></asp:repeater></itemtemplate></asp:repeater></form></body></html>Nestedrepeater.aspx.cs using System;using System.Data;using System.Data.SqlClient;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;namespace NestedRepeater{public class nestedrepeater :System.Web.UI.Page {protected System.Web.UI.WebControls.Repeater parentRepeater;public NestedRepeater() {Page.Init += new System.EventHandler(Page_Init); }public void Page_Load(object sender, EventArgs e) {//Create the connection and DataAdapter for the Authors table.SqlConnection cnn = new SqlConnection("server=(local);database=pubs; Integrated Security=SSPI ;");SqlDataAdapter cmd1 = new SqlDataAdapter("select * from authors",cnn);//Create and fill the DataSet.DataSet ds = new DataSet();cmd1.Fill(ds,"authors");//Create a second DataAdapter for the Titles table.SqlDataAdapter cmd2 = new SqlDataAdapter("select * from titleauthor",cnn);cmd2.Fill(ds,"titles");//Create the relation bewtween the Authors and Titles tables.ds.Relations.Add("myrelation",ds.Tables["authors"].Columns["au_id"],ds.Tables["titles"].Columns["au_id"]);//Bind the Authors table to the parent Repeater control, and call DataBind.parentRepeater.DataSource = ds.Tables["authors"];Page.DataBind();//Close the connection.cnn.Close(); }private void Page_Init(object sender, EventArgs e) {InitializeComponent(); }private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } }}绑定到父表启动 Microsoft Visual Studio .NET。在文件菜单上，指向新</p></div><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" 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