共享GridView DataGrid DataTable导出到Excel代码

下面是一个导出Excel文件的代码。

code
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;

using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Test
{
    /**//// <summary>
    /// 重载样例
    /// </summary>
    public class GridViewExport : ExcelExport
    {
        public GridViewExport(DataTable dt)
            : base(dt, true)
        {
        }
        public override void GridViewBoundEvent(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
               // e.Row.Cells[1].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
               // e.Row.Cells[3].Attributes.Add("style", "vnd.ms-excel.numberformat:￥#,###.00");
            }
        }
    }
    /**//// <summary>
    /// 重载样例
    /// </summary>
    public class DataGridExport : ExcelExport
    {
        public DataGridExport(DataTable dt)
            : base(dt, false)
        {
            //不使用动态列，就在这个地方设置表格和列
            //BoundColumn bc = new BoundColumn();
            //bc.DataField = "company";
            //bc.HeaderText = "你好";
            //oDG.Columns.Add(bc);
        }
        /**//// <summary>
        /// 设置列的样式
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public override void DataGridBoundEvent(object sender, DataGridItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                // e.Item.Cells[1].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
                //e.Item.Cells[3].Attributes.Add("style", "vnd.ms-excel.numberformat:￥#,###.00");
            }
        }
    }
    public abstract class ExcelExport
    {
        protected ExcelExport(DataTable dt, bool IsGV)
        {
            if (IsGV)
            {
                _IsGV = true;
                gv = new GridView();
                gv.RowDataBound += new GridViewRowEventHandler(gv_RowDataBound);
                gv.DataSource = dt;
            }
            else
            {
                oDG = new DataGrid();
                oDG.ItemDataBound += new DataGridItemEventHandler(oDG_ItemDataBound);
                oDG.DataSource = dt;
            }
        }

        void gv_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            GridViewBoundEvent(sender, e);
        }
        protected DataGrid oDG = null;
        protected GridView gv = null;
        private bool _IsGV = false;
        /**//// <summary>
        /// 如果是GridView就是True
        /// </summary>
        public bool IsGridView
        {
            get
            {
                return _IsGV;
            }
        }
        /**//// <summary>
        /// 导出Excel数据
        /// </summary>
        public void Export()
        {
            if (_IsGV)
            {
                if (gv.Columns.Count == 0)
                    gv.AutoGenerateColumns = true;
                else
                    gv.AutoGenerateColumns = false;
                gv.AllowPaging = false;
                gv.DataBind();
                ExportData(gv);
            }
            else
            {
                if (oDG.Columns.Count == 0)
                    oDG.AutoGenerateColumns = true;
                else
                {
                    oDG.AutoGenerateColumns = false;
                }
                oDG.DataBind();
                ExportData(oDG);
            }
        }

        /**//// <summary>
        /// 导出DataGrid为Excel
        /// </summary>
        /// <param name="dg"></param>
        public static void Export(DataGrid dg)
        {
            if (dg == null)
                throw new Exception("传入的DataGrid为空。");
            ExportData(dg);
        }

        private static void ExportData(object ob)
        {
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=Excel.xls");
            HttpContext.Current.Response.Charset = "GB2312";
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            HttpContext.Current.Response.ContentType = "application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword 
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=MyExcelFile.xls");
            HttpContext.Current.Response.ContentType = "application/excel";
            System.IO.StringWriter sw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
            if (ob as GridView != null)
                ((GridView)ob).RenderControl(htw);
            if (ob as DataGrid != null)
                ((DataGrid)ob).RenderControl(htw);
            HttpContext.Current.Response.Write(sw.ToString());
            HttpContext.Current.Response.End();
        }

        /**//// <summary>
        /// 导出GridView为Excel
        /// </summary>
        /// <param name="gv"></param>
        public static void Export(GridView gv)
        {
            if (gv == null)
                throw new Exception("传入的GridView为空。");
            ExportData(gv);
        }

        void oDG_ItemDataBound(object sender, DataGridItemEventArgs e)
        {
            DataGridBoundEvent(sender, e);
        }
        /**//// <summary>
        /// 设置DataGrid列的样式
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public virtual void DataGridBoundEvent(object sender, DataGridItemEventArgs e)
        {
        }
        /**//// <summary>
        /// 设置GridView列的样式
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public virtual void GridViewBoundEvent(object sender, GridViewRowEventArgs e)
        {
        }
    }
}