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CheckBoxList
SetChecked(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;
}