xml方式将dataset导出excel

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;

namespace Cinway.Common
{
    public class xmlParam {
        public string totalcount { get; set; }
        public string startdt { get; set; }
        public string enddt { get; set; }
        public string xmlNum { get; set; }
        public string deptcode { get; set; }
        public string deptname { get; set; }
        public string  strstart { get; set; }
        public string jszhu { get; set; }
        public string jszhang { get; set; }
        public string commonstr { get; set; }
        public string filename { get; set; }//新增zp
    }
   public class ExcelToolNew
    {
        public FileStream ToExcel(DataSet ds,string headstr,string footstr,xmlParam pa) {
            DataTable dt = ds.Tables[0];
            int rowcount = dt.Rows.Count;
            int rcount = dt.Rows.Count / 60;
            DataSet dataset = SplitDataTable(dt, rcount);
            dt.Clear();
            string[] strfilename = new string[dataset.Tables.Count];
            ManualResetEvent[] doneEvents = new ManualResetEvent[dataset.Tables.Count];
            Fibonacci[] fibArray = new Fibonacci[dataset.Tables.Count];
            int i = 0;
            foreach (DataTable datatable in dataset.Tables)
            {
                string sfilename = "D:\xmlfile\" + Guid.NewGuid() + ".XML";
                strfilename[i] = sfilename;
                Fibonacci fi = new Fibonacci();
                fi.WriteXML(datatable, sfilename, pa.xmlNum,pa.strstart);
                i++;
            }
            string filename = "D:\xmlfile\" + Guid.NewGuid() + ".xml";
            StreamReader srh = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(headstr), Encoding.Default);//读出表头部内容
            FileStream fs1 = new FileStream(filename, FileMode.OpenOrCreate);
            StreamWriter sw1 = new StreamWriter(fs1, Encoding.UTF8);
            sw1.WriteLine(srh.ReadToEnd().Replace("totalcount", pa.totalcount).Replace("StartDT", pa.startdt).Replace("EndDT",pa.enddt).Replace("deptcode", pa.deptcode).Replace("deptname", pa.deptname).Replace("jszhang", pa.jszhang).Replace("jszhu", pa.jszhu).Replace("commonstr", pa.commonstr));//把头部内容写到新文件中
            for (int k = 0; k < strfilename.Length; k++)
            {
                StreamReader sr1 = new StreamReader(strfilename[k], Encoding.Default);
                sw1.Write(sr1.ReadToEnd());//插入数据
            }
            StreamReader srf = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(footstr), Encoding.Default);//读出表尾部内容
            sw1.WriteLine(srf.ReadToEnd());
            sw1.Close();
            fs1.Close();
            FileStream fsm = new FileStream(filename, FileMode.Open);
            return fsm;
        }
        public string ToExcelnew(DataSet ds, string headstr, string footstr, xmlParam pa)
        {
            DataTable dt = ds.Tables[0];
            int rowcount = dt.Rows.Count;
            int rcount = dt.Rows.Count / 60;
            DataSet dataset = SplitDataTable(dt, rcount);
            dt.Clear();
            string[] strfilename = new string[dataset.Tables.Count];
            ManualResetEvent[] doneEvents = new ManualResetEvent[dataset.Tables.Count];
            Fibonacci[] fibArray = new Fibonacci[dataset.Tables.Count];
            int i = 0;
            foreach (DataTable datatable in dataset.Tables)
            {
                string sfilename = "D:\xmlfile\" + Guid.NewGuid() + ".XML";
                strfilename[i] = sfilename;
                Fibonacci fi = new Fibonacci();
                fi.WriteXML(datatable, sfilename, pa.xmlNum, pa.strstart);
                i++;
            }
            string filename = "D:\xmlfile\" + Guid.NewGuid() + ".xml";
            StreamReader srh = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(headstr), Encoding.Default);//读出表头部内容
            FileStream fs1 = new FileStream(filename, FileMode.OpenOrCreate);
            StreamWriter sw1 = new StreamWriter(fs1, Encoding.UTF8);
            sw1.WriteLine(srh.ReadToEnd().Replace("totalcount", pa.totalcount).Replace("StartDT", pa.startdt).Replace("EndDT", pa.enddt).Replace("deptcode", pa.deptcode).Replace("deptname", pa.deptname).Replace("jszhang", pa.jszhang).Replace("jszhu", pa.jszhu).Replace("commonstr", pa.commonstr));//把头部内容写到新文件中
            for (int k = 0; k < strfilename.Length; k++)
            {
                StreamReader sr1 = new StreamReader(strfilename[k], Encoding.Default);
                sw1.Write(sr1.ReadToEnd());//插入数据
            }
            StreamReader srf = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(footstr), Encoding.Default);//读出表尾部内容
            sw1.WriteLine(srf.ReadToEnd());
            sw1.Close();
            fs1.Close();
            string strfileName = Common.SecurityEncrypt.ESCEncrypt(pa.filename, "20170421");
            string strfilePath = Common.SecurityEncrypt.ESCEncrypt(filename, "20170421");
           //FileStream fsm = new FileStream(filename, FileMode.Open);
            return "filename=" + strfileName + "&filepath=" + strfilePath;
        }
        // DateTime enddt = DateTime.Now;
        // FileStream fss = new FileStream("C:\JISHI.TXT", FileMode.OpenOrCreate);
        // StreamWriter sws = new StreamWriter(fss, Encoding.UTF8);
        //sws.WriteLine(startdt.ToString() + "******" + enddt.ToString());
        // sws.Close();
        // fss.Close();
        /// <summary>
        /// 分解数据表
        /// </summary>
        /// <param name="originalTab">需要分解的表</param>
        /// <param name="rowsNum">每个表包含的数据量</param>
        /// <returns></returns>
        public DataSet SplitDataTable(DataTable originalTab, int rowsNum)
        {
            //获取所需创建的表数量
            if (rowsNum==0) {
                rowsNum = 1;
            }
            int tableNum = originalTab.Rows.Count / rowsNum;

            //获取数据余数
            int remainder = originalTab.Rows.Count % rowsNum;

            DataSet ds = new DataSet();

            //如果只需要创建1个表，直接将原始表存入DataSet
            if (tableNum == 0)
            {
                if (originalTab.Rows.Count==0) {
                    ds.Tables.Add(new DataTable());
                }
                else
                {
                    ds.Tables.Add(originalTab);
                }
            }
            else
            {
                DataTable[] tableSlice = new DataTable[tableNum];

                //Save orginal columns into new table.            
                for (int c = 0; c < tableNum; c++)
                {
                    tableSlice[c] = new DataTable();
                    foreach (DataColumn dc in originalTab.Columns)
                    {
                        tableSlice[c].Columns.Add(dc.ColumnName, dc.DataType);
                    }
                }
                //Import Rows
                for (int i = 0; i < tableNum; i++)
                {
                    // if the current table is not the last one
                    if (i != tableNum - 1)
                    {
                        for (int j = i * rowsNum; j < ((i + 1) * rowsNum); j++)
                        {
                            tableSlice[i].ImportRow(originalTab.Rows[j]);
                        }
                    }
                    else
                    {
                        for (int k = i * rowsNum; k < ((i + 1) * rowsNum + remainder); k++)
                        {
                            tableSlice[i].ImportRow(originalTab.Rows[k]);
                        }
                    }
                }

                //add all tables into a dataset                
                foreach (DataTable dt in tableSlice)
                {
                    ds.Tables.Add(dt);
                }
            }
            return ds;
        }
        public class Fibonacci
        {
            // ManualResetEvent _doneEvent;
            public void WriteXML(DataTable dt, string filename,string xmlNum,string strstart)
            {
                FileStream fs1 = new FileStream(filename, FileMode.OpenOrCreate);
                StreamWriter sw1 = new StreamWriter(fs1, Encoding.UTF8);
                sw1.WriteLine("");
                sw1.Close();
                fs1.Close();
                if (string.IsNullOrEmpty(strstart)) {
                    strstart = "<Cell ss:StyleID="" + xmlNum + ""><Data ss:Type="String">";
                }
                string strend = "</Data></Cell>";
                int jishu = 0;
                string xmlstr2 = "";
                foreach (DataRow row in dt.Rows)
                {
                    if (jishu == 10)
                    {
                        FileStream fs3 = new FileStream(filename, FileMode.Append);
                        StreamWriter sw3 = new StreamWriter(fs3, Encoding.UTF8);
                        sw3.WriteLine(xmlstr2);
                        sw3.Close();
                        fs3.Close();
                        xmlstr2 = "";
                        jishu = 0;
                    }
                    xmlstr2 += "<Row ss:AutoFitHeight="0" ss:Height="18.9375">";
                    for (int i = 0; i < row.ItemArray.Length; i++)
                    {
                        string str = row[i] == null ? "" : row[i].ToString();
                        if (str.Contains("<") || str.Contains(">"))
                        {
                            str = str.Replace('<', '＜');
                            str = str.Replace('>', '＞');
                        }
                        xmlstr2 += (strstart + str + strend);
                    }
                    xmlstr2 += "</Row>";
                    jishu++;
                }
                dt.Clear();
                FileStream fs2 = new FileStream(filename, FileMode.Append);
                StreamWriter sw2 = new StreamWriter(fs2, Encoding.UTF8);
                sw2.WriteLine(xmlstr2);
                sw2.Close();
                fs2.Close();
            }
        }
    }
}