OpenXML大数据集要非常慢
我正在使用OpenXml将大数据转换为Excel，我正在使用以下导出到Excel类
http://www.codeproject.com/Articles/692092/A-free-Export-to-Excel-Csharp-class-using-OpenXML
以下是我class的代码。
public static bool CreateExcelDocumentAsStream(DataSet ds, string filename, System.Web.HttpResponse Response) { try { System.IO.MemoryStream stream = new System.IO.MemoryStream(); using (SpreadsheetDocument document = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook, true)) { WriteExcelFile(ds, document); } stream.Flush(); stream.Position = 0; Response.ClearContent(); Response.Clear(); Response.Buffer = true; Response.Charset = ""; // NOTE: If you get an "HttpCacheability does not exist" error on the following line, make sure you have // manually added System.Web to this project's References. Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache); Response.AddHeader("content-disposition", "attachment; filename=" + filename); Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; byte[] data1 = new byte[stream.Length]; stream.Read(data1, 0, data1.Length); stream.Close(); Response.BinaryWrite(data1); Response.Flush(); // Feb2015: Needed to replace "Response.End();" with the following 3 lines, to make sure the Excel was fully written to the Response System.Web.HttpContext.Current.Response.Flush(); System.Web.HttpContext.Current.Response.SuppressContent = true; System.Web.HttpContext.Current.ApplicationInstance.CompleteRequest(); return true; } catch (Exception ex) { Trace.WriteLine("Failed, exception thrown: " + ex.Message); return false; } } /// <summary> /// Create an Excel file, and write it to a file. /// </summary> /// <param name="ds">DataSet containing the data to be written to the Excel.</param> /// <param name="excelFilename">Name of file to be written.</param> /// <returns>True if successful, false if something went wrong.</returns> public static bool CreateExcelDocument(DataSet ds, string excelFilename) { try { using (SpreadsheetDocument document = SpreadsheetDocument.Create(excelFilename, SpreadsheetDocumentType.Workbook)) { WriteExcelFile(ds, document); } Trace.WriteLine("Successfully created: " + excelFilename); return true; } catch (Exception ex) { Trace.WriteLine("Failed, exception thrown: " + ex.Message); return false; } } private static void WriteExcelFile(DataSet ds, SpreadsheetDocument spreadsheet) { // Create the Excel file contents. This function is used when creating an Excel file either writing // to a file, or writing to a MemoryStream. spreadsheet.AddWorkbookPart(); spreadsheet.WorkbookPart.Workbook = new DocumentFormat.OpenXml.Spreadsheet.Workbook(); // My thanks to James Miera for the following line of code (which prevents crashes in Excel 2010) spreadsheet.WorkbookPart.Workbook.Append(new BookViews(new WorkbookView())); // If we don't add a "WorkbookStylesPart", OLEDB will refuse to connect to this .xlsx file ! WorkbookStylesPart workbookStylesPart = spreadsheet.WorkbookPart.AddNewPart<WorkbookStylesPart>("rIdStyles"); Stylesheet stylesheet = new Stylesheet(); workbookStylesPart.Stylesheet = stylesheet; // Loop through each of the DataTables in our DataSet, and create a new Excel Worksheet for each. uint worksheetNumber = 1; Sheets sheets = spreadsheet.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets()); foreach (DataTable dt in ds.Tables) { // For each worksheet you want to create string worksheetName = dt.TableName; // Create worksheet part, and add it to the sheets collection in workbook WorksheetPart newWorksheetPart = spreadsheet.WorkbookPart.AddNewPart<WorksheetPart>(); Sheet sheet = new Sheet() { Id = spreadsheet.WorkbookPart.GetIdOfPart(newWorksheetPart), SheetId = worksheetNumber, Name = worksheetName }; // If you want to define the Column Widths for a Worksheet, you need to do this *before* appending the SheetData // http://social.msdn.microsoft.com/Forums/en-US/oxmlsdk/thread/1d93eca8-2949-4d12-8dd9-15cc24128b10/ sheets.Append(sheet); // Append this worksheet's data to our Workbook, using OpenXmlWriter, to prevent memory problems WriteDataTableToExcelWorksheet(dt, newWorksheetPart); worksheetNumber++; } spreadsheet.WorkbookPart.Workbook.Save(); } private static void WriteDataTableToExcelWorksheet(DataTable dt, WorksheetPart worksheetPart) { OpenXmlWriter writer = OpenXmlWriter.Create(worksheetPart, Encoding.ASCII); writer.WriteStartElement(new Worksheet()); writer.WriteStartElement(new SheetData()); string cellValue = ""; // Create a Header Row in our Excel file, containing one header for each Column of data in our DataTable. // // We'll also create an array, showing which type each column of data is (Text or Numeric), so when we come to write the actual // cells of data, we'll know if to write Text values or Numeric cell values. int numberOfColumns = dt.Columns.Count; bool[] IsNumericColumn = new bool[numberOfColumns]; bool[] IsDateColumn = new bool[numberOfColumns]; string[] excelColumnNames = new string[numberOfColumns]; for (int n = 0; n < numberOfColumns; n++) excelColumnNames[n] = GetExcelColumnName(n); // // Create the Header row in our Excel Worksheet // uint rowIndex = 1; writer.WriteStartElement(new Row { RowIndex = rowIndex }); for (int colInx = 0; colInx < numberOfColumns; colInx++) { DataColumn col = dt.Columns[colInx]; AppendTextCell(excelColumnNames[colInx] + "1", col.ColumnName, ref writer); IsNumericColumn[colInx] = (col.DataType.FullName == "System.Decimal") || (col.DataType.FullName == "System.Int32") || (col.DataType.FullName == "System.Double") || (col.DataType.FullName == "System.Single"); IsDateColumn[colInx] = (col.DataType.FullName == "System.DateTime"); } writer.WriteEndElement(); // End of header "Row" // // Now, step through each row of data in our DataTable... // double cellNumericValue = 0; foreach (DataRow dr in dt.Rows) { // ...create a new row, and append a set of this row's data to it. ++rowIndex; writer.WriteStartElement(new Row { RowIndex = rowIndex }); for (int colInx = 0; colInx < numberOfColumns; colInx++) { cellValue = dr.ItemArray[colInx].ToString(); cellValue = ReplaceHexadecimalSymbols(cellValue); // Create cell with data if (IsNumericColumn[colInx]) { // For numeric cells, make sure our input data IS a number, then write it out to the Excel file. // If this numeric value is NULL, then don't write anything to the Excel file. cellNumericValue = 0; if (double.TryParse(cellValue, out cellNumericValue)) { cellValue = cellNumericValue.ToString(); AppendNumericCell(excelColumnNames[colInx] + rowIndex.ToString(), cellValue, ref writer); } } else if (IsDateColumn[colInx]) { // This is a date value. DateTime dtValue; string strValue = ""; if (DateTime.TryParse(cellValue, out dtValue)) strValue = dtValue.ToShortDateString(); AppendTextCell(excelColumnNames[colInx] + rowIndex.ToString(), strValue, ref writer); } else { // For text cells, just write the input data straight out to the Excel file. AppendTextCell(excelColumnNames[colInx] + rowIndex.ToString(), cellValue, ref writer); } } writer.WriteEndElement(); // End of Row } writer.WriteEndElement(); // End of SheetData writer.WriteEndElement(); // End of worksheet writer.Close(); } private static void AppendTextCell(string cellReference, string cellStringValue, ref OpenXmlWriter writer) { // Add a new Excel Cell to our Row writer.WriteElement(new Cell { CellValue = new CellValue(cellStringValue), CellReference = cellReference, DataType = CellValues.String }); } private static void AppendNumericCell(string cellReference, string cellStringValue, ref OpenXmlWriter writer) { // Add a new Excel Cell to our Row writer.WriteElement(new Cell { CellValue = new CellValue(cellStringValue), CellReference = cellReference, DataType = CellValues.Number }); } private static string ReplaceHexadecimalSymbols(string txt) { string r = "[\x00-\x08\x0B\x0C\x0E-\x1F\x26]"; return Regex.Replace(txt, r, "", RegexOptions.Compiled); } 我正在调用这样的方法
CreateExcelFile.CreateExcelDocumentAsStream(ds, ExportToExcel.FileName, response);
这工作正常，但它有性能问题，它非常缓慢。 我的excel数据有49K行和100列。
有没有办法提高性能？
任何build议，将不胜感激 。
提前致谢
尝试closedXML并注意不同之处。
https://www.codeproject.com/Tips/1107815/Export-an-Excel-File-using-ClosedXML