.net导出Excel几种方式比较
数据原共400条数据,21列,我是双核cpu,4G内存
1. Excel com组件
要3秒左右,上千条30秒+这种方法比较慢，要引用Microsoft.Office.Interop.Excel
#region DataSet导入到Excel里（最原始样式） /// <summary> /// DataSet导入到Excel里，多个DataTable分成多个Sheet,Sheet名以TableName命名 /// </summary> /// <param name="DS">要导入的Excel</param> /// <param name="FilePathAndName">要保存的路径和文件名（绝对路径)</param> public static void DataSetToExcel(DataSet DS, string FilePathAndName) { string strName = FilePathAndName.Replace(@"\\", @"\").Replace(@"\\", @"\").Replace(@"\\", @"\"); strName = FilePathAndName; Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application(); try { excel.Visible = false; //设置禁止弹出保存和覆盖的询问提示框 excel.DisplayAlerts = false; excel.AlertBeforeOverwriting = false; //增加一个工作簿 Microsoft.Office.Interop.Excel.Workbook book = excel.Workbooks.Add(true); System.Reflection.Missing miss = System.Reflection.Missing.Value; //添加工作表 Microsoft.Office.Interop.Excel.Worksheet sheets = (Microsoft.Office.Interop.Excel.Worksheet) book.Worksheets.Add(miss, miss, 19, Microsoft.Office.Interop.Excel.XlSheetType.xlWorksheet); for (int i = 0; i < DS.Tables.Count; i++) { System.Data.DataTable table = DS.Tables[i]; //获取一个工作表 //Microsoft.Office.Interop.Excel.Worksheet sheet = book.Worksheets[i + 1] as Microsoft.Office.Interop.Excel.Worksheet; Microsoft.Office.Interop.Excel.Worksheet sheet = book.Worksheets.Add(book.Worksheets[i + 1], Type.Missing, Type.Missing, Type.Missing) as Microsoft.Office.Interop.Excel.Worksheet; int rowIndex = 1; int colIndex = 0; foreach (DataColumn col in table.Columns) { colIndex++; sheet.Cells[1, colIndex] = col.ColumnName; Microsoft.Office.Interop.Excel.Range Range1 = (Microsoft.Office.Interop.Excel.Range)sheet.Cells[1, colIndex]; Range1.Font.Bold = true;//表头字体加粗 Range1.Borders.Value = 1; } foreach (DataRow row in table.Rows) { rowIndex++; colIndex = 0; foreach (DataColumn col in table.Columns) { colIndex++; sheet.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString(); } } //sheet.Name = tableNames[i]; sheet.Name = GetLegalFileName(DS.Tables[i].TableName.ToString()); } //删除多余Sheet for (int g = 1; g <= book.Worksheets.Count; g++) { Microsoft.Office.Interop.Excel.Worksheet sheet = book.Worksheets[g] as Microsoft.Office.Interop.Excel.Worksheet; if (sheet.Name.Length > 5 && sheet.Name.Substring(0, 5) == "Sheet") { sheet.Delete(); g--; } } //book.Save(); book.SaveAs(strName, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); book.Close(false, miss, miss); book = null; } catch (Exception) { throw; } finally { KillExcelProcess(excel);//结束Excel进程 GC.WaitForPendingFinalizers(); GC.Collect(); } } #endregion
2. OLEDB
这个需要3秒左右，要using System.Data.OleDb;
#region oledb方式 public static void ExcelExport(DataTable dt, string filepath, string tablename) { //excel 2003格式 string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties=Excel 8.0;"; //Excel 2007格式 //string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filepath + ";Extended Properties=Excel 12.0 Xml;"; try { using (OleDbConnection con = new OleDbConnection(connString)) { con.Open(); StringBuilder strSQL = new StringBuilder(); strSQL.Append("CREATE TABLE ").Append("[" + tablename + "]"); strSQL.Append("("); for (int i = 0; i < dt.Columns.Count; i++) { strSQL.Append("[" + dt.Columns[i].ColumnName + "] text,"); } strSQL = strSQL.Remove(strSQL.Length - 1, 1); strSQL.Append(")"); OleDbCommand cmd = new OleDbCommand(strSQL.ToString(), con); cmd.ExecuteNonQuery(); for (int i = 0; i < dt.Rows.Count; i++) { strSQL.Clear(); StringBuilder strfield = new StringBuilder(); StringBuilder strvalue = new StringBuilder(); for (int j = 0; j < dt.Columns.Count; j++) { strfield.Append("[" + dt.Columns[j].ColumnName + "]"); strvalue.Append("'" + dt.Rows[i][j].ToString() + "'"); if (j != dt.Columns.Count - 1) { strfield.Append(","); strvalue.Append(","); } else { } } cmd.CommandText = strSQL.Append(" insert into [" + tablename + "]( ") .Append(strfield.ToString()) .Append(") values (").Append(strvalue).Append(")").ToString(); cmd.ExecuteNonQuery(); } con.Close(); } Console.WriteLine("OK"); } catch (Exception ex) { Console.WriteLine(ex.Message); }
3.NPOI
这个在有二种方式，第一种在web页面下，很快，秒的速度，但是下下来的方式没有保存在某一目录下
aspx页只有一个按钮就可以了，.cs文件代码如下
using System; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; using NPOI.HSSF.UserModel; using NPOI.HPSF; using NPOI.POIFS.FileSystem; using NPOI.SS.UserModel; namespace ExportXlsToDownload { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { string filename="test.xls"; Response.ContentType = "application/vnd.ms-excel"; Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}",filename)); Response.Clear(); InitializeWorkbook(); GenerateData(); GetExcelStream().WriteTo(Response.OutputStream); Response.End(); } HSSFWorkbook hssfworkbook; MemoryStream GetExcelStream() { //Write the stream data of workbook to the root directory MemoryStream file = new MemoryStream(); hssfworkbook.Write(file); return file; } void GenerateData() { ISheet sheet1 = hssfworkbook.CreateSheet("Sheet1"); sheet1.CreateRow(0).CreateCell(0).SetCellValue("This is a Sample"); int x = 1; for (int i = 1; i <= 400; i++) { IRow row = sheet1.CreateRow(i); for (int j = 0; j < 20; j++) { row.CreateCell(j).SetCellValue(x++); } } } void InitializeWorkbook() { hssfworkbook = new HSSFWorkbook(); ////create a entry of DocumentSummaryInformation DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation(); dsi.Company = "NPOI Team"; hssfworkbook.DocumentSummaryInformation = dsi; ////create a entry of SummaryInformation SummaryInformation si = PropertySetFactory.CreateSummaryInformation(); si.Subject = "NPOI SDK Example"; hssfworkbook.SummaryInformation = si; } } }
第二种方式,可以保存在目录下,也是秒存，代码如下
public class NPOIExcel { //最大数据条数 readonly int EXCEL03_MaxRow = 65535; /// <summary> /// 将DataTable转换为excel2003格式。 /// </summary> /// <param name="dt"></param> /// <returns></returns> public byte[] DataTable2Excel(DataTable dt, string sheetName) { IWorkbook book = new HSSFWorkbook(); if (dt.Rows.Count < EXCEL03_MaxRow) DataWrite2Sheet(dt, 0, dt.Rows.Count - 1, book, sheetName); else { int page = dt.Rows.Count / EXCEL03_MaxRow; for (int i = 0; i < page; i++) { int start = i * EXCEL03_MaxRow; int end = (i * EXCEL03_MaxRow) + EXCEL03_MaxRow - 1; DataWrite2Sheet(dt, start, end, book, sheetName + i.ToString()); } int lastPageItemCount = dt.Rows.Count % EXCEL03_MaxRow; DataWrite2Sheet(dt, dt.Rows.Count - lastPageItemCount, lastPageItemCount, book, sheetName + page.ToString()); } MemoryStream ms = new MemoryStream(); book.Write(ms); return ms.ToArray(); } private void DataWrite2Sheet(DataTable dt, int startRow, int endRow, IWorkbook book, string sheetName) { ISheet sheet = book.CreateSheet(sheetName); IRow header = sheet.CreateRow(0); for (int i = 0; i < dt.Columns.Count; i++) { ICell cell = header.CreateCell(i); string val = dt.Columns[i].Caption ?? dt.Columns[i].ColumnName; cell.SetCellValue(val); } int rowIndex = 1; for (int i = startRow; i <= endRow; i++) { DataRow dtRow = dt.Rows[i]; IRow excelRow = sheet.CreateRow(rowIndex++); for (int j = 0; j < dtRow.ItemArray.Length; j++) { excelRow.CreateCell(j).SetCellValue(dtRow[j].ToString()); } } } }
第二种方式调用如下:
DataTable dt=GetData();
NPOIExcel myhelper = new NPOIExcel(); byte[] data = myhelper.DataTable2Excel(dt,"sheet"); string path = "d:\\temp" + DateTime.Now.Ticks.ToString() + ".xls"; if (!File.Exists(path)) { FileStream fs = new FileStream(path, FileMode.CreateNew); fs.Write(data, 0, data.Length); fs.Close(); }