ASP.NET用DataSet导出到Excel的方法

/读取临时文件 

 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%'"); 

 //同时将虚拟目录下的Data作为临时文件目录。 
 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(); 
 
 //建立表结构 
 objCmd.CommandText = @"CREATE TABLE Sheet1(器材代码 varchar,名称 varchar, 规格 varchar)"; 
 objCmd.ExecuteNonQuery(); 
 //建立插入动作的Command 
 
 objCmd.CommandText = "INSERT INTO Sheet1(器材代码, 名称,规格) 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)); 
 
 //遍历DataSet将数据插入新建的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(); 
 
 //提供下载 
 //清除临时文件 
 HttpResponse response = HttpContext.Current.Response; 
 response.Clear(); 
 //为输出作准备 
 response.WriteFile(urlPath + fileName); 
 string httpHeader="attachment;filename=KCMX.Xls"; 
 response.AppendHeader("Content-Disposition", httpHeader); 
 response.Flush(); 
 //输出完毕后清除临时文件 
 string strSaveDir = "../Data/"; 
 string strFile = Server.MapPath(strSaveDir + fileName).ToString(); 
 //string sss = urlPath + fileName; 
 System.IO.File.Delete(strFile);//删除临时文件 
 response.End(); 

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