如何把数据库中的内容绑定到CheckBoxList上？_checkboxlist数据绑定-优快云博客

本文链接：https://blog.youkuaiyun.com/xft_1981/article/details/1423873

本文介绍了如何将数据库中的数据绑定到ASP.NET的CheckBoxList控件上，以实现显示用户上次选择的权限项。通过示例展示了利用Login和ProdClass两个表，以及在ProdClass表中增加UserID字段来实现这一功能。

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有时候我们不但要把CheckBoxList的数据写入到数据库，还要把数据库的内容与CheckBoxList对应，让他显示上次我们选中的项，我是这么实现的：

比方说我们要给用户赋予不同的权限，那么我们数据库有Login,ProdClass两张表，那么我们在ProdClass表中插入一个字段UserID，下面是程序：

UserClass.aspx页面：

<%@ Page language="c#" Codebehind="UserClass.aspx.cs" AutoEventWireup="false" Inherits="LabWeb.adminstra.UserClass" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>UserClass</title>
        <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
        <meta content="C#" name="CODE_LANGUAGE">
        <meta content="JavaScript" name="vs_defaultClientScript">
        <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <FONT face="宋体">
                <asp:radiobuttonlist id="RadioButtonList1" runat="server" RepeatColumns="3" RepeatDirection="Horizontal"
                    AutoPostBack="True"></asp:radiobuttonlist>
                <hr color="red">
            </FONT>
            <asp:checkboxlist id="CheckBoxList1" runat="server" RepeatColumns="3" RepeatDirection="Horizontal"></asp:checkboxlist>
            <hr color="red">
            <asp:button id="Button1" runat="server" Text="设置分类" Width="176px"></asp:button></form>
    </body>
</HTML>

后台UserClass.aspx.cs

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 LabWeb.adminstra

{

/// <summary>

/// UserClass 的摘要说明。

/// </summary>

public class UserClass : System.Web.UI.Page

{

protected System.Web.UI.WebControls.CheckBoxList CheckBoxList1;

protected System.Web.UI.WebControls.Button Button1;

protected System.Web.UI.WebControls.RadioButtonList RadioButtonList1;

private void Page_Load(object sender, System.EventArgs e)

{

if(!this.IsPostBack)

{

//绑定用户

SqlConnection con=DB.CreateCon();

con.Open();

SqlCommand cmd=new SqlCommand("select * from Login",con);

SqlDataReader sdr =cmd.ExecuteReader();

this.RadioButtonList1.DataSource=sdr;

this.RadioButtonList1.DataTextField="UserName";

this.RadioButtonList1.DataValueField="UserID";

this.RadioButtonList1.DataBind();

sdr.Close();

//绑定类别，LabSedtype为你的类别表

cmd.CommandText="select * from LabSedtype";

SqlDataReader sdr1=cmd.ExecuteReader();

this.CheckBoxList1.DataSource=sdr1;

this.CheckBoxList1.DataTextField="SecondTypeName";

this.CheckBoxList1.DataValueField="SecondTypeID";

this.CheckBoxList1.DataBind();

sdr1.Close();

con.Close();

}

// 在此处放置用户代码以初始化页面

}

Web 窗体设计器生成的代码

private void Button1_Click(object sender, System.EventArgs e)

{

//判断是否选中

string UserID=this.RadioButtonList1.SelectedValue;

if(UserID=="")

{

Response.Write("<script>alert('请选择要设置权限的管理员！')</script>");

}

else

{

string SelectID="0";

foreach(ListItem chk in this.CheckBoxList1.Items)

{

if(chk.Selected)

{

SelectID=chk.Value;

SqlConnection con=DB.CreateCon();

con.Open();

SqlCommand cmd =new SqlCommand("Update LabSedType set UserID='"+UserID+"' where SecondTypeID ='"+SelectID+"' ",con);

cmd.ExecuteNonQuery();

con.Close();

}

else

{

string NoSelected=chk.Value;

SqlConnection con=DB.CreateCon();

con.Open();

SqlCommand cmd =new SqlCommand("Update LabSedType set UserID='' where SecondTypeID ='"+NoSelected+"'and UserID='"+UserID+"' ",con);

cmd.ExecuteNonQuery();

con.Close();

}

Response.Write("<font color=Red size=14px>您已经成功设置类别编号！！</font>");

}

private void RadioButtonList1_SelectedIndexChanged(object sender, System.EventArgs e)

{

//当选择了用户的时候，自动显示出他的管理类别

foreach(ListItem chk in this.CheckBoxList1.Items)

{

chk.Selected=false;

}

string SecondTypeID="";

SqlConnection con=DB.CreateCon();

con.Open();

SqlCommand cmd =new SqlCommand("select SecondTypeID from LabSedType where UserID='"+this.RadioButtonList1.SelectedValue+"'",con);

SqlDataReader sdr =cmd.ExecuteReader();

while(sdr.Read())

{

SecondTypeID=sdr.GetInt32(0).ToString();

foreach(ListItem chk in this.CheckBoxList1.Items)

{

if(chk.Value==SecondTypeID)

{

chk.Selected=true;

}

sdr.Close();

con.Close();

}