扩展GridView添加checkbox

我们在用GridView时,通常都要为GridView添加CHECKBOX这一列,所以把它扩展来,比较方便
下面在扩展用到了ITemplate这个接口,这个接口每次都会调用InstantiateIn这个方法,所以我们在这个方法上
实现一些加入checkbox的操作.
代码如下:

Code
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Collections;
using System.Web.UI.WebControls;
using System.Web.UI;
using System.Drawing;


namespace WebClass
{

    public class GridViewOfCheckBox:GridView
    {
        public enum CustomColumnAlign
        {
            Left, Right
        }
        
        private CustomColumnAlign _align = CustomColumnAlign.Left;
        private string _checkBoxID="CheckBox1";
        private Color _mouseOverColor;
        private DataControlFieldCollection _columnCol = new DataControlFieldCollection();

        [Browsable(true)]
        [Description("所建立的checkBox所在对齐方式")]
        [Category("扩展")]
        public CustomColumnAlign Align
        {
            get
            {
                return _align;
            }
            set
            {
                _align = value;
            }
        }

        [Browsable(true)]
        [Description("所建立的checkBoxＩＤ")]
      //  [DefaultValue("CheckBox1")]
        [Category("扩展")]
        public string CheckBoxID
        {
            get
            {
                return _checkBoxID;
            }
            set
            {
                _checkBoxID = value;
            }
        }

            

  鼠标经过行时的颜色#region 鼠标经过行时的颜色
            [Browsable(true)]
            [Description("鼠标经过行的颜色")]
            [DefaultValue("")]
            [Category("扩展")]
            public Color MouseOverColor
            {
                get
                {
                    return _mouseOverColor;
                }
                set
                {
                    _mouseOverColor = value;
                }
            }

            protected override void OnRowDataBound(GridViewRowEventArgs e)
            {
                if (!_mouseOverColor.IsEmpty)
                {
                    if (e.Row.RowType == DataControlRowType.DataRow)
                    {
                        //鼠标经过时，行背景色变 
                        e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#" + this._mouseOverColor.ToArgb().ToString("X").Substring(2, 6) + "'");
                        //        //当鼠标移开时还原背景色
                        e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
                    }
                }
                base.OnRowDataBound(e);
            }
  #endregion

        protected override ICollection CreateColumns(PagedDataSource dataSource, bool useDataSource)
        {
            ArrayList col = base.CreateColumns(dataSource, useDataSource) as ArrayList;
            CreatCheckBox(col);
            _columnCol.Clear();
            foreach (DataControlField c in col)
            {
                _columnCol.Add(c);
            }
            return col;
        }


        public void CreatCheckBox(ArrayList col)
        {
            TemplateField checkColumn = new TemplateField();
            checkColumn.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
            checkColumn.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
            CheckBoxItemTemplate cbItemTemplate = new CheckBoxItemTemplate();
            CheckBoxItemTemplate.CheckBoxItemId=_checkBoxID;
            checkColumn.ItemTemplate = cbItemTemplate;
            CheckBoxHeaderTemplate cbHeaderTemplate = new CheckBoxHeaderTemplate();
            checkColumn.HeaderTemplate = cbHeaderTemplate;
            if (Align == CustomColumnAlign.Left)
            {
                col.Insert(0, checkColumn);
            }
            else if (Align == CustomColumnAlign.Right)
            {
                col.Add(checkColumn);
            }
        }
      

        
    }

    public class CheckBoxItemTemplate : ITemplate
    {
        private static string _CheckBoxID;

        public static string CheckBoxItemId
        {
            get
            {
                return _CheckBoxID;
            }
            set
            {
                _CheckBoxID = value;
            }
        }
        public void InstantiateIn(Control container)
        {
            CheckBox cb = new CheckBox();
            cb.ID = _CheckBoxID;
            container.Controls.Add(cb);
        }
    }
    public class CheckBoxHeaderTemplate : ITemplate
    {
        public void InstantiateIn(Control container)
        {
            Label la=new Label();
            la.Text="选择";
            container.Controls.Add(la);
        }
    }
}