用repeater嵌套CheckBox+CheckBoxList实现树型选择菜单 _ASP.NET教程

导读：用repeater嵌套CheckBox+CheckBoxList实现树型选择菜单

复制代码代码如下：

<HTML>
<body>
<form id="Form1" runat="server">
<asp:repeater id="parentRepeater" runat="server">
<itemtemplate>
<b>
<asp:CheckBox id="CheckBoxRole" Text='<%# DataBinder.Eval(Container.DataItem,"RoleId") %>' runat="server" AutoPostBack="True" OnCheckedChanged="CheckBoxRole_CheckedChanged">
</asp:CheckBox>
<asp:CheckBoxList id="CheckBoxListUserId" Runat="server" DataValueField="RoleId"></asp:CheckBoxList>
</b>
<br>
</itemtemplate>
</asp:repeater>
</form>
</body>
</HTML>
后台代码
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace center
{
///
/// NestedRepeater 的摘要说明。
///
public class NestedRepeater : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Repeater parentRepeater;
private void Page_Load(object sender, System.EventArgs e)
{
if(!Page.IsPostBack)
{
// 在此处放置用户代码以初始化页面
// 为Authors表创建 Connection 和 DataAdapter
string cnnString = @"server=azure;database=CnForums;uid=sa;pwd=;";
SqlConnection cnn = new SqlConnection(cnnString);
SqlDataAdapter cmd1 = new SqlDataAdapter("select * from aspnet_Roles",cnn);
//创建填充 DataSet.
DataSet ds = new DataSet();
cmd1.Fill(ds,"Roles");
// 为Titles表创建 DataAdapter
SqlDataAdapter cmd2 = new SqlDataAdapter("select * from aspnet_UsersInRoles",cnn);
cmd2.Fill(ds,"Users");
// 创建 Authors 表和 Titles 表之间的关系.
ds.Relations.Add("myrelation",
ds.Tables["Roles"].Columns["RoleId"],
ds.Tables["Users"].Columns["RoleId"]);
// 绑定Authors到父Repeater
parentRepeater.DataSource = ds.Tables["Roles"];
Page.DataBind();
cnn.Close();
cnn.Dispose();
}
}
Web 窗体设计器生成的代码
public void CheckBoxRole_CheckedChanged(object sender, System.EventArgs e)
{
for(int i=0;i<this.parentRepeater.Items.Count;i++)
{
CheckBox cb = (CheckBox)parentRepeater.Items[i].FindControl("CheckBoxRole");
CheckBoxList cbl = (CheckBoxList)parentRepeater.Items[i].FindControl("CheckBoxListUserId");
if (cb.Checked==true)
{
cbl.Visible=true;
}
if (cb.Checked==false)
{
cbl.Visible=false;
}
}
}
private void parentRepeater_ItemDataBound(object sender, System.Web.UI.WebControls.RepeaterItemEventArgs e)
{
string cnnString = @"server=azure;database=CnForums;uid=sa;pwd=;";
SqlConnection cnn = new SqlConnection(cnnString);
SqlDataAdapter cmd1 = new SqlDataAdapter("select * from aspnet_Roles",cnn);
//创建填充 DataSet.
DataSet ds = new DataSet();
cmd1.Fill(ds,"Roles");
//绑定checkboxlist
CheckBoxList cb=(CheckBoxList)e.Item.FindControl("CheckBoxListUserId");
DataRowView row=(DataRowView)e.Item.DataItem;
string root=row["RoleId"].ToString();
cb.DataSource=ds;
cb.DataTextField="RoleId";
cb.DataValueField="RoleId";
cb.DataBind();
}
}
}

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