GridView导出Excel 类库

using System;
using System.Data;
using System.Configuration;
using System.IO;
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 Unit
{

    public class GridViewExportUtil
    {
        /// <summary>
        /// 把 GridView 呈现的内容导出到 Excel
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="gv"></param>
        public static void Export(string fileName, GridView gv,HttpResponse pageResponse,string filepath)
        {
            pageResponse.Clear();
            pageResponse.Charset = "UTF-8";
            pageResponse.Buffer = false;
            pageResponse.ClearHeaders();
            pageResponse.ContentEncoding = System.Text.Encoding.UTF8;
            pageResponse.HeaderEncoding = System.Text.Encoding.UTF8;
            pageResponse.AddHeader("content-disposition", string.Format("attachment; filename={0}", fileName));
            //pageResponse.ContentType = "application/ms-excel";
            pageResponse.ContentType = "application/octet-stream";
     
            using (StringWriter sw = new StringWriter())
            {
                
                using (HtmlTextWriter htw = new HtmlTextWriter(sw))
                {
                    //  Create a form to contain the grid
                    Table table = new Table();
                    table.Style.Add("border-top", "solid 1px #cdcdcd");
                    table.Style.Add("border-left", "solid 1px #cdcdcd");

                    //  add the header row to the table
                    if (gv.HeaderRow != null)
                    {
                        GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                        table.Rows.Add(gv.HeaderRow);
                    }

                    //  add each of the data rows to the table
                    foreach (GridViewRow row in gv.Rows)
                    {
                        GridViewExportUtil.PrepareControlForExport(row);
                        table.Rows.Add(row);
                    }

                    //  add the footer row to the table
                    if (gv.FooterRow != null)
                    {
                        GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
                        table.Rows.Add(gv.FooterRow);
                    }

                    //  render the table into the htmlwriter
                    table.RenderControl(htw);
                    string date = System.DateTime.Now.ToString("MMddyyyy");
                    string outFileName = "ExportExcel_" + date + fileName;
                    string comPath = "Export/" + outFileName;
                    string path = filepath + "\\Export";

                    if (Directory.Exists(path) == false)
                    {
                        System.IO.Directory.CreateDirectory(path);
                     }
                    path = path + "\\" + outFileName;
                    System.Text.Encoding encode = System.Text.Encoding.Unicode;
                    StreamWriter stream = new StreamWriter(path, false, encode);
                    stream.Write(sw.ToString());
                    stream.Close();
                  
                    //stream.Write(sw);
                    ////  render the htmlwriter into the response
                    pageResponse.Write(sw.ToString());
                    pageResponse.End();
                    pageResponse.Flush();
                    pageResponse.Close();
                }
            }
        }

        /// <summary>
        /// 把 GridView 呈现的内容导出到 Excel
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="gv"></param>
        public static void Export(string fileName, GridView gv)
        {
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", fileName));
            HttpContext.Current.Response.ContentType = "application/ms-excel";


            using (StringWriter sw = new StringWriter())
            {

                using (HtmlTextWriter htw = new HtmlTextWriter(sw))
                {
                    //  Create a form to contain the grid
                    Table table = new Table();
                    table.Style.Add("border-top", "solid 1px #cdcdcd");
                    table.Style.Add("border-left", "solid 1px #cdcdcd");

                    //  add the header row to the table
                    if (gv.HeaderRow != null)
                    {
                        GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                        table.Rows.Add(gv.HeaderRow);
                    }

                    //  add each of the data rows to the table
                    foreach (GridViewRow row in gv.Rows)
                    {
                        GridViewExportUtil.PrepareControlForExport(row);
                        table.Rows.Add(row);
                    }

                    //  add the footer row to the table
                    if (gv.FooterRow != null)
                    {
                        GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
                        table.Rows.Add(gv.FooterRow);
                    }

                    //  render the table into the htmlwriter
                    table.RenderControl(htw);


                    //  render the htmlwriter into the response
                    HttpContext.Current.Response.Write(sw.ToString());
                    HttpContext.Current.Response.End();
                }
            }
        }

        /// <summary>
        /// 把 GridView 呈现的内容导出到 Excel
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="gv"></param>
        public static string GetExportFileName(string fileName, GridView gv, string filepath)
        {
            try
            {

                using (StringWriter sw = new StringWriter())
                {

                    using (HtmlTextWriter htw = new HtmlTextWriter(sw))
                    {
                        //  Create a form to contain the grid
                        Table table = new Table();
                        table.Style.Add("border-top", "solid 1px #cdcdcd");
                        table.Style.Add("border-left", "solid 1px #cdcdcd");

                        //  add the header row to the table
                        if (gv.HeaderRow != null)
                        {
                            GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                            table.Rows.Add(gv.HeaderRow);
                        }

                        //  add each of the data rows to the table
                        foreach (GridViewRow row in gv.Rows)
                        {
                            GridViewExportUtil.PrepareControlForExport(row);
                            table.Rows.Add(row);
                        }

                        //  add the footer row to the table
                        if (gv.FooterRow != null)
                        {
                            GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
                            table.Rows.Add(gv.FooterRow);
                        }

                        //  render the table into the htmlwriter
                        table.RenderControl(htw);
                        string date = System.DateTime.Now.ToString("MMddyyyy");
                        string outFileName = "ExportExcel_" + date + "_" +DateTime.Now.Ticks.ToString() + "_" + fileName;
                        string comPath = "Export/" + outFileName;
                        string path = filepath + "\\Export";

                        if (Directory.Exists(path) == false)
                        {
                            System.IO.Directory.CreateDirectory(path);
                        }
                        path = path + "\\" + outFileName;
                        System.Text.Encoding encode = System.Text.Encoding.Unicode;
                        StreamWriter stream = new StreamWriter(path, false, encode);
                        stream.Write(sw.ToString());
                        stream.Close();

                        return comPath;

                    }
                }
            }
            catch (Exception e)
            {
                throw;
            }
        }
        /// <summary>
        /// Replace any of the contained controls with literals
        /// </summary>
        /// <param name="control"></param>
        private static void PrepareControlForExport(Control control)
        {
            for (int i = 0; i < control.Controls.Count; i++)
            {
                Control current = control.Controls[i];
                if (current is LinkButton)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));
                }
                else if (current is ImageButton)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));
                }
                else if (current is HyperLink)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));
                }
                else if (current is DropDownList)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));
                }
                else if (current is CheckBox)
                {
                    control.Controls.Remove(current);
                    control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));
                }
                else if (current is System.Web.UI.WebControls.DataControlFieldHeaderCell)
                {
                    ((DataControlFieldHeaderCell)current).Style.Add("border-right", "solid 1px #cdcdcd");
                    ((DataControlFieldHeaderCell)current).Style.Add("border-bottom", "solid 1px #cdcdcd");
                    ((DataControlFieldHeaderCell)current).Style.Add("font-family", "arial");
                    ((DataControlFieldHeaderCell)current).Style.Add("color", "#3D3D3D");
                    ((DataControlFieldHeaderCell)current).Style.Add("font-size", "10pt");
                    ((DataControlFieldHeaderCell)current).Style.Add("background-color", "#F1FBFF");
                }
                else if (current is System.Web.UI.WebControls.DataControlFieldCell)
                {
                    ((DataControlFieldCell)current).Style.Add("border-right", "solid 1px #cdcdcd");
                    ((DataControlFieldCell)current).Style.Add("border-bottom", "solid 1px #cdcdcd");
                    ((DataControlFieldCell)current).Style.Add("font-family", "arial");
                    ((DataControlFieldCell)current).Style.Add("color", "#3D3D3D");
                    ((DataControlFieldCell)current).Style.Add("font-size", "10pt");

                }

                if (current.HasControls())
                {
                    GridViewExportUtil.PrepareControlForExport(current);
                }
            }
        }
    }
}

调用方法：

   protected void ButtonExportGrid_Click(object sender, EventArgs e)
        {
            DataTable dtTrListExport = bllTr_list.GetDataList(DatePickerBegintime.StringValue.ToString().Trim(), DatePickerEndtime.StringValue.ToString().Trim());
            dtTravellingListExport.Columns.Remove(dtTrListExport .Columns["tr_id"]);
            dtTravellingListExport.Columns.Remove(dtTrListExport .Columns["Itinerary"]);
            dtTravellingListExport.Columns.Remove(dtTrListExport .Columns["Durat"]);

            this.GridViewReport.AllowPaging = false;
            this.GridViewReport.DataSource = dtTrListExport ;
            this.GridViewReport.DataBind();
            string fileName = GridViewExportUtil.GetExportFileName("Customers.xls", this.GridViewReport, Server.MapPath(""));
            HttpResponse httpResponse = System.Web.HttpContext.Current.Response;
            FileInfo fileinfo = new FileInfo(Server.MapPath("") + @"\" + fileName);
            httpResponse.Clear();
            httpResponse.ClearHeaders();
            httpResponse.Buffer = false;
            httpResponse.ContentType = "application/octet-stream";
            httpResponse.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileinfo.Name, System.Text.Encoding.UTF8));
            //httpResponse.AppendHeader("Content-Length", file.Length.ToString());
            httpResponse.WriteFile(fileinfo.FullName);
            httpResponse.End();
            httpResponse.Flush();
            httpResponse.Close();
            this.GridViewReport.AllowPaging = true;
        }