asp.net的checkboxlist绑定数据

1.把数据绑定到CheckBoxList中

  protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                SqlConnection con = GetDBCon.GetCon();
                con.Open();
                SqlDataAdapter sda = new SqlDataAdapter("select * from admin", con);
                DataSet ds = new DataSet();
                sda.Fill(ds,"admin");
                this.CheckBoxList1.DataSource = ds.Tables[0];
                this.CheckBoxList1.DataTextField = "username";//绑定的字段名
                this.CheckBoxList1.DataValueField = "userid";//绑定的值
                this.CheckBoxList1.DataBind();
              
            
               
            }
        }

2.循环读取出来

 protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.Lab2.Text = "";
            for (int i = 0; i < CheckBoxList1.Items.Count; i++)
            {
                if (this.CheckBoxList1.Items[i].Selected)
                {
                    this.Lab2.Text = this.Lab2.Text+CheckBoxList1.Items[i].Text+".";
                }
            }
        }

#region 设置或者得到CheckBoxList选中了的值
        /**//// <summary>
        /// 初始化CheckBoxList中哪些是选中了的         /// </summary>
        /// <param name="checkList">CheckBoxList</param>
        /// <param name="selval">选中了的值串例如："0,1,1,2,1"</param>
        /// <param name="separator">值串中使用的分割符例如"0,1,1,2,1"中的逗号</param>
        public static string SetChecked(CheckBoxList checkList,string selval,string separator)
        ...{
            selval = separator + selval + separator;        //例如："0,1,1,2,1"->",0,1,1,2,1,"
            for(int i=0; i<checkList.Items.Count; i++)
            ...{
                checkList.Items[i].Selected = false;
                string val = separator + checkList.Items[i].Value + separator;
                if(selval.IndexOf(val)!=-1)
                ...{
                    checkList.Items[i].Selected = true;
                    selval = selval.Replace(val,separator);        //然后从原来的值串中删除已经选中了的
                    if(selval == separator)        //selval的最后一项也被选中的话，此时经过Replace后，只会剩下一个分隔符
                    ...{       
                        selval += separator;        //添加一个分隔符
                    }
                }
            }
            selval = selval.Substring(1,selval.Length-2);        //除去前后加的分割符号
            return selval;
        }

        /**//// <summary>
        /// 得到CheckBoxList中选中了的值
        /// </summary>
        /// <param name="checkList">CheckBoxList</param>
        /// <param name="separator">分割符号</param>
        /// <returns></returns>
        public static string GetChecked(CheckBoxList checkList, string separator)
        ...{
            string selval = "";
            for(int i=0;i<checkList.Items.Count;i++)
            ...{
                if(checkList.Items[i].Selected)
                ...{
                    selval += checkList.Items[i].Value + separator;
                }
            }
            return selval;
        }
        #endregion

样式设置：

RepeatColumns="3" 列数
RepeatLayout="Table" table布局方式
RepeatDirection="Horizontal"
或
RepeatDirection="Vertical"