CheckBoxList 获取与设置选中的值

/// <summary>
///CheckBoxListHelper 的摘要说明
///CheckBoxList获取与设置选中的值
/// </summary>
public class CheckBoxListHelper
{
	private CheckBoxListHelper()
	{
		//
		//TODO: 在此处添加构造函数逻辑
		//
	}
    /// <summary>
    /// 值的分割符
    /// </summary>
    private const string SEPARATOR=",";
    /// <summary>
    /// 获取CheckBoxList被选中的值
    /// </summary>
    /// <param name="cblist"></param>
    /// <returns></returns>
    public static string GetCheckBoxListCheckValue(CheckBoxList cbList)
    {
        if (cbList == null) return "";

        System.Text.StringBuilder builder = new System.Text.StringBuilder();

        foreach (ListItem item in cbList.Items)
        {

            if (item.Selected)
            {
                builder.AppendFormat("{0}{1}", item.Value,SEPARATOR);
            }
        }
        if (builder.Length > 0)
        {
            builder.Remove(builder.Length - 1, 1);
        }
        return builder.ToString();
    }
    /// <summary>
    /// 设置CheckBoxList选中的值
    /// </summary>
    /// <param name="cbList"></param>
    /// <returns></returns>
    public static void SetCheckBoxListCheck(CheckBoxList cbList,string values)
    {
        //当没有选择值时,取消所有选择项
        if (string.IsNullOrEmpty(values)) values=SEPARATOR;

        if (cbList == null) return;
        //例如1,2,3 变为 1,2,3,
        values = values + SEPARATOR;
        foreach (ListItem item in cbList.Items)
        {
            item.Selected = false;//取消被选择
            string value = item.Value;
            if (values.IndexOf(value + SEPARATOR) > -1)
            {
                item.Selected = true;
            }
        }

    }
}