/讀取臨時文件

   GYYW.DA.Common.Base_SqlDataBase daBZDM = new GYYW.DA.Common.Base_SqlDataBase();

   DataSet dsBZDM = daBZDM.GetDataSetBySql("select QCDM,MC,GG from WG_BZDM where QCDM like '02%'");

   //同時將虛擬目錄下的Data作為臨時文件目錄。

   string urlPath = HttpContext.Current.Request.ApplicationPath + "/Data/";

   string physicPath = HttpContext.Current.Server.MapPath(urlPath);

   //string fileName = Guid.NewGuid() + ".Xls";

   string fileName ="DownLoad.Xls";

   string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + physicPath + fileName +";Extended Properties=Excel 8.0;"; 
 

   OleDbConnection objConn = new OleDbConnection(connString);

   OleDbCommand objCmd = new OleDbCommand();

   objCmd.Connection = objConn;

   objCmd.Connection.Open(); 
  

   //建立表結構

   objCmd.CommandText = @"CREATE TABLE Sheet1(器材代碼 varchar,名稱 varchar, 規格 varchar)";

   objCmd.ExecuteNonQuery();

   //建立插入動作的Command 
 

   objCmd.CommandText = "INSERT INTO Sheet1(器材代碼, 名稱,規格) VALUES (@QCDM, @MC, @GG)";  

   objCmd.Parameters.Clear();

   
   objCmd.Parameters.Add(new OleDbParameter("@QCDM", OleDbType.VarChar));

   objCmd.Parameters.Add(new OleDbParameter("@MC", OleDbType.VarChar));

   objCmd.Parameters.Add(new OleDbParameter("@GG",OleDbType.VarChar)); 
   

   //遍歷DataSet將數據插入新建的Excel文件中

   foreach (DataRow row in dsBZDM.Tables[0].Rows)

   {  

    for (int i=0; i<objCmd.Parameters.Count; i++)

    {

     objCmd.Parameters[i].Value = row[i];

    }

    objCmd.ExecuteNonQuery();

   }

   objCmd.Connection.Close();

   
   //提供下載

   //清除臨時文件

   HttpResponse response = HttpContext.Current.Response;

   response.Clear();

   //為輸出作準備

   response.WriteFile(urlPath + fileName);

   string httpHeader="attachment;filename=KCMX.Xls";

   response.AppendHeader("Content-Disposition", httpHeader);

   response.Flush();

   //輸出完畢后清除臨時文件

   string strSaveDir = "../Data/";

   string strFile = Server.MapPath(strSaveDir + fileName).ToString();

   //string sss = urlPath + fileName;

   System.IO.File.Delete(strFile);//刪除臨時文件

   response.End();