DataGird中使用RadioButton的一个解决办法

在DataGird中使用RadioButton时，最郁闷的莫过于不能单选，而且没有CommandName,CommandArgument属性了，下面的代码解决了这个问题.
下载代码

using System;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Web.UI;
using System.Web.UI.WebControls;

[assembly:TagPrefix("Calfenyin.Web.Controls", "calfenyin")]
namespace Calfenyin.Web.Controls
{
    /**//// <summary>
    /// An enhanced radiobutton,especially for use in datagrid,and add commandName and commandArgument property
    /// </summary>
    
    [ToolboxBitmap(typeof(RadioButtonPlus),"Resources.RadioButtonPlus.bmp")]
    public class RadioButtonPlus : CheckBox, IPostBackDataHandler,IPostBackEventHandler
    {
        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);
            if (((this.Page != null) && !this.Checked) && this.Enabled)
            {
                this.Page.RegisterRequiresPostBack(this);
            }
            if (this.GroupName.Length == 0)
            {
                this.GroupName = this.UniqueID;
            }
        }

        protected override void Render(HtmlTextWriter writer)
        {
            this.RenderInputTag(writer,this.ClientID,this.Attributes["onclick"]);
        }

        private void RenderInputTag(HtmlTextWriter writer, string clientID, string onClick)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Id, clientID);
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "radio");
            writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueGroupName);
            writer.AddAttribute(HtmlTextWriterAttribute.Value, this.ValueAttribute);
            if (this.Checked)
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Checked, "checked");
            }
            if (!this.Enabled)
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
            }
            if (this.AutoPostBack)
            {
                if (onClick != null)
                {
                    onClick = onClick + this.Page.GetPostBackClientEvent(this, "");
                }
                else
                {
                    onClick = this.Page.GetPostBackClientEvent(this, "");
                }
                writer.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
                writer.AddAttribute("language", "javascript");
            }
            else if (onClick != null)
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
            }
            string accessKey = this.AccessKey;
            if (accessKey.Length > 0)
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Accesskey, accessKey);
            }
            int tabIndex = this.TabIndex;
            if (tabIndex != 0)
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Tabindex, tabIndex.ToString(NumberFormatInfo.InvariantInfo));
            }
            writer.RenderBeginTag(HtmlTextWriterTag.Input);
            writer.RenderEndTag();
        }

        bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
        {
            string strValue = postCollection[this.UniqueGroupName];
            bool bFound = false;
            if ((strValue != null) && strValue.Equals(this.ValueAttribute))
            {
                if (!this.Checked)
                {
                    this.Checked = true;
                    bFound = true;
                }
                return bFound;
            }
            if (this.Checked)
            {
                this.Checked = false;
            }
            return bFound;
        }


        void IPostBackDataHandler.RaisePostDataChangedEvent()
        {
            this.OnCheckedChanged(EventArgs.Empty);
        }

        public virtual string GroupName
        {
            get
            {
                string strGroupName = (string) this.ViewState["GroupName"];
                if (strGroupName != null)
                {
                    return strGroupName;
                }
                return string.Empty;
            }
            set
            {
                this.ViewState["GroupName"] = value;
            }
        }

        private string UniqueGroupName
        {
            get
            {
                return this.GroupName;
            }
        }

        private string ValueAttribute
        {
            get
            {
                return this.UniqueID;
            }
        }

        [DefaultValue("")]
        public string CommandArgument
        {
            get
            {
                string strCommandArgument = (string) this.ViewState["CommandArgument"];
                if (strCommandArgument != null)
                {
                    return strCommandArgument;
                }
                return string.Empty;
            }
            set
            {
                this.ViewState["CommandArgument"] = value;
            }
        }

        [DefaultValue("")]
        public string CommandName
        {
            get
            {
                string strCommandName = (string) this.ViewState["CommandName"];
                if (strCommandName != null)
                {
                    return strCommandName;
                }
                return string.Empty;
            }
            set
            {
                this.ViewState["CommandName"] = value;
            }
        }

        IPostBackEventHandler Members#region IPostBackEventHandler Members

        public void RaisePostBackEvent(string eventArgument)
        {
            this.RaiseBubbleEvent(this,new CommandEventArgs(this.CommandName, this.CommandArgument));
        }

        #endregion
    }
}