DataTable内容导出为CSV文件

CSVHelper.cs内容：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Threading;
using System.IO;
using System.Data;
using System.Windows.Forms;

namespace IMSCommonFunction
{
    public class CSVHelper
    {
        public static string FilterCSVCell(string cellContent)
        {
            bool isAddFlag = false;
            if (cellContent.IndexOf(""") != -1)
            {
                cellContent = cellContent.Replace(""", """");
                cellContent = """ + cellContent + """;
                isAddFlag = true;
            }
            if (cellContent.IndexOf(",") != -1 && isAddFlag != true)
            {
                cellContent = """ + cellContent + """;
            }
            return cellContent;
        }

        public static void ExportCSVFile(HttpResponse response, string fullPath, string Content)
        {
            try
            {
                response.Buffer = true;
                response.Clear();
                response.Charset = System.Text.Encoding.Default.BodyName;
                response.ContentEncoding = System.Text.Encoding.UTF8;// System.Text.Encoding.GetEncoding("GB2312");//GB2312用Excel打开时，没有乱码。
                response.AppendHeader("Content-Disposition", "attachment;filename=" + fullPath);
                response.ContentType = "application/ms-excel";
                response.Output.Write(Content);
                response.Flush();
                response.End();
            }
            catch (ThreadAbortException)
            {
            }
            catch (Exception ex)
            {
                throw new ApplicationException(string.Format("Export CSV file have a error: {0}", fullPath), ex);
            }
        }

        public static void FileDownload(string FullFileName)
        {
            FileInfo DownloadFile = new FileInfo(FullFileName);
            System.Web.HttpContext.Current.Response.Clear();
            System.Web.HttpContext.Current.Response.ClearHeaders();
            System.Web.HttpContext.Current.Response.Buffer = false;
            string extension = Path.GetExtension(FullFileName);
            extension = string.IsNullOrEmpty(extension) ? extension : extension.ToLower();
            switch (extension)
            {
                case ".xml":
                    System.Web.HttpContext.Current.Response.ContentType = "text/xml";
                    break;
                default:
                    System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream";
                    break;
            }
            string browser = System.Web.HttpContext.Current.Request.UserAgent.ToUpper();
            bool isNeedEncode = !browser.Contains("FIREFOX");
            System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" +
                (isNeedEncode ? System.Web.HttpUtility.UrlEncode(DownloadFile.Name, System.Text.Encoding.UTF8) : DownloadFile.Name));
            System.Web.HttpContext.Current.Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
            System.Web.HttpContext.Current.Response.Flush();
            if (System.Web.HttpContext.Current.Response.IsClientConnected)
                System.Web.HttpContext.Current.Response.WriteFile(DownloadFile.FullName);

            //出错
            System.Web.HttpContext.Current.Response.End();
            System.Web.HttpContext.Current.ApplicationInstance.CompleteRequest();
        }

        public static void DataHtmlToExcel(HttpResponse response, DataTable dt, string strFileName)
        {
            string style = @"<style> .text { mso-number-format:@; } </script> "; //设置格式
            //设置Response
            response.Clear();
            response.Buffer = true;
            response.Charset = "utf-8";
            response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            //Response.Charset = "utf-8";
            if (strFileName.Length > 0)
            {
                response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(Encoding.UTF8.GetBytes(strFileName)));
            }
            else
            {
                response.AppendHeader("Content-Disposition", "attachment;filename=Excel.xls");
            }
            //Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
            HttpContext.Current.Response.ContentType = "application/ms-excel";

            //绑定数据到DataGrid1
            System.Web.UI.WebControls.DataGrid DataGrid1 = new System.Web.UI.WebControls.DataGrid();
            DataGrid1.DataSource = dt.DefaultView;
            DataGrid1.DataBind();
            //将DataGrid1构成的html代码写进StringWriter
            //DataGrid1.Page.EnableViewState = false;
            System.IO.StringWriter tw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
            DataGrid1.RenderControl(hw);

            response.Write(style);//注意
            response.Write(tw.ToString());
            response.Flush();
            response.End();
        }

        public static void ExportExcel(HttpResponse response, DataTable dt, string filename)
        {
            try
            {
                response.Clear();
                response.BufferOutput = true;
                response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
                response.AppendHeader("Content-Disposition", "attachment;filename=" +
                    HttpUtility.UrlEncode(Encoding.UTF8.GetBytes(filename)));
                response.ContentType = "application/ms-excel";
                StringBuilder colHeaders = new StringBuilder();
                StringBuilder items = new StringBuilder();

                DataRow[] dr = dt.Select();

                int i = 0;
                int clength = dt.Columns.Count;

                for (i = 0; i < clength; i++)
                {
                    if (i == clength - 1)
                    {
                        colHeaders.Append(dt.Columns[i].Caption.ToString() + "
");
                    }
                    else
                    {
                        colHeaders.Append(dt.Columns[i].Caption.ToString() + "	");
                    }
                }
                response.Write(colHeaders.ToString());

                foreach (DataRow row in dr)
                {
                    for (i = 0; i < clength; i++)
                    {
                        if (i == clength - 1)
                        {
                            items.Append(row[i].ToString() + "
");
                        }
                        else
                        {
                            items.Append(row[i].ToString() + "	");
                        }
                    }
                }
                response.Write(items.ToString());
            }
            catch (Exception ex)
            {
                response.Write(ex.Message);
            }
            finally
            {
                response.Flush();
                response.End();
            }
        }

        public static void DataTableToCSV(DataTable table, string file)
        {
            string title = "";
            FileStream fs = new FileStream(file, FileMode.Create);
            StreamWriter sw = new StreamWriter(new BufferedStream(fs), System.Text.Encoding.Default);
            for (int i = 0; i < table.Columns.Count; i++)
            {
                title += table.Columns[i].ColumnName + ",";
            }
            title = title.Substring(0, title.Length - 1) + "
";
            sw.Write(title);
            foreach (DataRow row in table.Rows)
            {
                string line = "";
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    line += row[i].ToString() + ",";
                }
                line = line.Substring(0, line.Length - 1) + "
";
                sw.Write(line);
            }
            sw.Close();
            fs.Close();
        }
    }
}

页面后台按钮事件处理：

protected void btnExportCSV_Click(object sender, EventArgs e)
{
    try
    {
        string sql = Server.UrlDecode(Request["Sql"]);
        DataTable dt = Bll.Report.CustomReport.GetCustomReport(sql);
        StringBuilder sbHeader = new StringBuilder();
        StringBuilder sbContent = new StringBuilder();
        DateTime tempDateTime = DateTime.MinValue;
        string tempVal = "";
        for (int i = 0, len = dt.Rows.Count; i < len; i++)
        {
            for (int j = 0, len2 = dt.Columns.Count; j < len2; j++)
            {
                if (i == 0)
                {
                    sbHeader.AppendFormat("{0},", dt.Columns[j].ColumnName);
                }
                tempVal = dt.Rows[i][j].ToString();
                if(DateTime.TryParse(tempVal,out tempDateTime))
                    tempVal = tempDateTime.ToString("dd-MM-yyyy HH:mm:ss");
                sbContent.AppendFormat("{0},", IMSCommonFunction.CSVHelper.FilterCSVCell(tempVal));
            }
            sbContent.Remove(sbContent.Length - 1, 1);
            sbContent.AppendLine();
        }
        sbHeader.Remove(sbHeader.Length - 1, 1);
        sbHeader.AppendLine();
        IMSCommonFunction.CSVHelper.ExportCSVFile(this.Response,
                                                  string.Format("CustomReport_{0}.csv", DateTime.Now.ToString("ddMMyyyy_HHmmss")),
                                                  sbHeader.ToString() + sbContent.ToString());
    }
    catch (Exception ex)
    {
        IMSCommonFunction.SystemEventLog.LogEvent("CustomReport.aspx,export csv file Errormsg", ex, "common", this.CurrentUserId);
        this.ShowErrorMsg(ex);
    }
}