/// <summary>
    /// 单选按钮列
    /// </summary>
    /// <remarks>
    /// 如果没有设置GroupName，则使用GridView的ID作为GroupName
    /// 如果没有设置DataField，则使用RowIndex作为Value
    /// 允许设置DataFormatString格式化数据
    /// </remarks>
    [AspNetHostingPermission(SecurityAction.Demand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    public class RadioButtonSelectField : DataControlField
    {
        /// <summary>
        /// 单选按钮组名，默认去GridView的ClientID
        /// </summary>
        [Description("单选按钮组名，默认去GridView的ClientID")]
        public string RadioButtonGroupName
        {
            get
            {
                return this.ViewState["RadioButtonGroupName"] as string;
            }
            set
            {
                this.ViewState["RadioButtonGroupName"] = value;
            }
        }/// <summary>
        /// 单选按钮的样式
        /// </summary>
        [Description("单选按钮的样式")]
        public string RadioButtonCssClass
        {
            get
            {
                return this.ViewState["RadioButtonCssClass"] as string;
            }
            set
            {
                this.ViewState["RadioButtonCssClass"] = value;
            }
        }/// <summary>
        /// 要绑定的数据表达式
        /// </summary>
        [Description("要绑定的数据表达式")]
        public string DataField
        {
            get
            {
                return this.ViewState["DataField"] as string;
            }
            set
            {
                this.ViewState["DataField"] = value;
            }
        }/// <summary>
        /// 要绑定的数据表达式格式
        /// </summary>
        [Description("要绑定的数据表达式格式")]
        public string DataFormatString
        {
            get
            {
                return this.ViewState["DataFormatString"] as string;
            }
            set
            {
                this.ViewState["DataFormatString"] = value;
            }
        }/// <summary>
        /// return self;
        /// </summary>
        /// <returns></returns>
        protected override DataControlField CreateField()
        {
            return this;
        }/// <summary>
        /// 添加控件
        /// </summary>
        /// <param name="cell"></param>
        /// <param name="cellType"></param>
        /// <param name="rowState"></param>
        /// <param name="rowIndex"></param>
        public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
        {
            base.InitializeCell(cell, cellType, rowState, rowIndex);if (cellType == DataControlCellType.DataCell)
            {
                var literal = new Literal();if (string.IsNullOrEmpty(this.DataField))
                {
                    SetLiteralHtml(literal, rowIndex.ToString());
                }
                else
                {
                    literal.DataBinding += new EventHandler(literal_DataBinding);
                }
                
                cell.Controls.Add(literal);
            }
        }void literal_DataBinding(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(this.DataField))
            {
                return;
            }

            var literal