EPPlus导出两千万记录的测试代码

采用导入100w条记录一个文件，然后合并的方式

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using System; using System.IO; using OfficeOpenXml; using System.Data; using System.Diagnostics; using System.ComponentModel; using System.Collections.Generic;   namespace ConsoleApp2 {     class Program     {         static void Main(string[] args)         {                Stopwatch watch = new Stopwatch();             watch.Start();             List<string> zlist = new List<string>();                using (DataTable sourceTable = new DataTable())             {                 sourceTable.TableName = "test";                 sourceTable.Columns.Add("NO", typeof(string));                 sourceTable.Columns.Add("a", typeof(int));                 sourceTable.Columns.Add("b", typeof(float));                                   for (int i = 0; i < 40000000 / 1; i++)                 {                     DataRow dr = sourceTable.NewRow();                     dr["NO"] = "#" + (i + 1).ToString(); ;                     dr["a"] = i;                     dr["b"] = i;                     sourceTable.Rows.Add(dr);                     dr = null;                 }                       int dd = 1000000 / 1;                 int pages = (int)sourceTable.Rows.Count / dd + 1;                 if (sourceTable.Rows.Count % dd == 0)                     pages = pages - 1;                          for (int i = 1; i <= pages; i++)                 {                     string zfilename = Guid.NewGuid().ToString() + ".xlsx";                     zlist.Add(zfilename);                        FileInfo zfile = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + zfilename);                        using (ExcelPackage excel = new ExcelPackage(zfile))                     {                         ExcelWorksheet ws = excel.Workbook.Worksheets.Add(sourceTable.TableName + i.ToString());                             for (int zcol = 0; zcol < sourceTable.Columns.Count; zcol++)                         {                             ws.Cells[1, zcol + 1].Value = sourceTable.Columns[zcol].ColumnName;                         }                           int zrow = 0;                         while (sourceTable.Rows.Count > 0)                         {                             for (int zcol = 0; zcol < sourceTable.Columns.Count; zcol++)                             {                                 ws.Cells[zrow + 2, zcol + 1].Value = sourceTable.Rows[0][zcol];                             }                                sourceTable.Rows.RemoveAt(0);                             zrow++;                             if (zrow % dd == 0)                                 break;                         }                               Console.WriteLine(string.Format("pageindex:{0}" ,i));                         excel.Save();                                                }                    }                          sourceTable.Rows.Clear();                 sourceTable.Columns.Clear();                 sourceTable.Clear();                 sourceTable.Reset();                   }             GC.Collect();             GC.WaitForFullGCComplete();                                        string zpath = AppDomain.CurrentDomain.BaseDirectory;             zpath = zpath.Substring(0, zpath.Length - 1);                         MergeExcel(zpath, zlist, string.Format("{0}.xlsx" ,Guid.NewGuid()));                foreach (string item in zlist)             {                 File.Delete(zpath + "\\" + item);             }             watch.Stop();                                               Console.Write("用时:" + watch.Elapsed.ToString());             Console.ReadLine();             Console.ReadLine();               }            public static DataTable DtSelectTop(int from, int to, DataTable oDT)         {             if (oDT.Rows.Count < from) return oDT;                DataTable NewTable = oDT.Clone();             DataRow[] rows = oDT.Select("1=1");             for (int i = from; i < to; i++)             {                 ((DataRow)rows[i])["NO"] = "#" + (i + 1).ToString();                 NewTable.ImportRow((DataRow)rows[i]);             }             return NewTable;         }               private static bool MergeExcel(string _stFilePath, List<string> _listFiles, string _stSaveFileName)         {             ExcelPackage epMergeFile = new ExcelPackage();             bool result = true;             try             {                 string stSheetName = string.Empty;                 int zi = 0;                 foreach (string item in _listFiles)                 {                     zi++;                     FileInfo newFile = new FileInfo(_stFilePath + "\\" + item);                                    using (ExcelPackage pck = new ExcelPackage(newFile))                     {                                            ExcelWorkbook workBook = pck.Workbook;                         if (workBook != null)                         {                             if (workBook.Worksheets.Count > 0)                             {                                   stSheetName = workBook.Worksheets[1].Name;                                 epMergeFile.Workbook.Worksheets.Add(stSheetName, workBook.Worksheets[1]);                             }                         }                     }                 }             }             catch (Exception ex)             {                 result = false;                 Debug.WriteLine("合并文件失败:" + ex.Message);                 throw new Exception("合并文件失败！");             }                if (result)             {                 string stFile = _stFilePath + "\\" + _stSaveFileName;                 epMergeFile.SaveAs(new FileInfo(stFile));                 epMergeFile.Dispose();             }                return result;         }     } }