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("\"") != -)
             {
                 cellContent = cellContent.Replace("\"", "\"\"");
                 cellContent = "\"" + cellContent + "\"";
                 isAddFlag = true;
             }
             if (cellContent.IndexOf(",") != - && 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 > )
             {
                 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 = ;
                 int clength = dt.Columns.Count;

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

                 foreach (DataRow row in dr)
                 {
                     for (i = ; i < clength; i++)
                     {
                         if (i == clength - )
                         {
                             items.Append(row[i].ToString() + "\n");
                         }
                         else
                         {
                             items.Append(row[i].ToString() + "\t");
                         }
                     }
                 }
                 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 = ; i < table.Columns.Count; i++)
             {
                 title += table.Columns[i].ColumnName + ",";
             }
             title = title.Substring(, title.Length - ) + "\n";
             sw.Write(title);
             foreach (DataRow row in table.Rows)
             {
                 string line = "";
                 for (int i = ; i < table.Columns.Count; i++)
                 {
                     line += row[i].ToString() + ",";
                 }
                 line = line.Substring(, line.Length - ) + "\n";
                 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 = , len = dt.Rows.Count; i < len; i++)
         {
             for (int j = , len2 = dt.Columns.Count; j < len2; j++)
             {
                 if (i == )
                 {
                     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 - , );
             sbContent.AppendLine();
         }
         sbHeader.Remove(sbHeader.Length - , );
         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);
     }
 }