数据导出到excel

 //由dataset导出Excel        

        public void CreateExcel(DataSet ds,string typeid,string FileName) 

        { 

            HttpResponse resp; 

            resp = Page.Response; 

            resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); 

            resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName); 

            string colHeaders= "", ls_item=""; 

            int i=0; 

  

            //定义表对象和行对像，同时用DataSet对其值进行初始化 

            DataTable dt=ds.Tables[0]; 

            DataRow[] myRow=dt.Select(""); 

            // typeid=="1"时导出为EXCEL格式文档；typeid=="2"时导出为XML格式文档 

            if(typeid=="1") 

            { 

                //取得数据表各列标题，各标题之间以\t分割，最后一个列标题后加回车符 

                for(i=0;i<dt.Columns.Count;i++)

                {                    

                    if(i==dt.Columns.Count-1)

                    {

                        colHeaders +=dt.Columns[i].Caption.ToString() +"\n";    

                    }

                    else

                    {

                        colHeaders+=dt.Columns[i].Caption.ToString()+"\t"; 

                    }

                }

                //向HTTP输出流中写入取得的数据信息 

                resp.Write(colHeaders); 

                //逐行处理数据 

                foreach(DataRow row in myRow) 

                { 

                    //在当前行中，逐列获得数据，数据之间以\t分割，结束时加回车符\n 

                    for(i=0;i<dt.Columns.Count;i++)

                    {

                          

                        if(i==dt.Columns.Count-1)

                        {

                            ls_item += row[i].ToString() +"\n"; 

                        }

                        else

                        {

                            ls_item +=row[i].ToString() + "\t";  

                        }

                    }

                    //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据 

                    resp.Write(ls_item); 

                    ls_item=""; 

                } 

            } 

            else 

            { 

                if(typeid=="2") 

                { 

                    //从DataSet中直接导出XML数据并且写到HTTP输出流中 

                    resp.Write(ds.GetXml()); 

                } 

            } 

            //写缓冲区中的数据到HTTP头文档中 

            resp.End(); 

        }