C# CheckBoxList数据操作（转）

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 dual", 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+".";                }            }        }

我们选用了CheckBoxList来实现爱好的收集和显示

1.收集时,将CheckBoxList里选中的项转换成字符串，并用“，”隔开这里只要调用方法GetChecked(CheckBoxList checkList, string separator)就可以获取到想要的数据。然后存入数据库。

2.显示时,先从库里获取爱好的数据（刚刚用“，”隔开的字符串）,　然后调用方法SetChecked(CheckBoxList checkList,string selval,string separator)就可以将库里的数据用CheckBoxList的形式表现出来

......方法的使用： //这里获取CheckBoxList中的选中项并用","隔开string str=GetChecked(this.checkList1, ",");......//这里是将str这个字符串的值又设回CheckBoxListSetChecked(this.checkList1,str,",");

/// <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："1,2,3,4,5,7"</param>        /// <param name="parator">值串中使用的分割符例如"1,2,3,4,5,7"中的逗号【此处是标点符号】</param>        public static string SetChecked(CheckBoxList checkList, string selval, string parator)        {            selval = parator + selval + parator;        //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 = parator + checkList.Items[i].Value + parator;                if (selval.IndexOf(val) != -1)                {                    checkList.Items[i].Selected = true;                    selval = selval.Replace(val, parator);        //然后从原来的值串中删除已经选中了的                    if (selval == parator)        //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 += parator;        //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;        }      

获取选中项：

一：/// <summary>        /// 获取选中CheckBoxList的值        /// </summary>        /// <param name="CBList">CheckBoxList 的ID</param>        /// <returns>以","分隔的字符串</returns>        public static string GetCheckBoxListValue(CheckBoxList CBList)        {            string strTemp = "";

            for (int i = 0; i < CBList.Items.Count; i++)            {                if (CBList.Items[i].Selected)                {                    if (strTemp == "")                    {                        strTemp = CBList.Items[i].Value;                    }                    else                    {                        strTemp += "," + CBList.Items[i].Value;                    }                }            }

            return strTemp;        }

二：

/// <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 parator)        {            string selval = "";            for(int i=0;i<checkList.Items.Count;i++)            {                if(checkList.Items[i].Selected)                {                    selval += checkList.Items[i].Value + parator;                }            }            return selval;        }