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
下面是我类(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);
}
我是这样调用方法的
CreateExcelFile.CreateExcelDocumentAsStream(ds, ExportToExcel.FileName, response);
这工作正常，但它有性能问题并且非常慢。我的 Excel 数据有 49K 行和 100 列。
有没有办法提高性能？
如有任何建议，我们将不胜感激。
提前致谢
请您参考如下方法:
尝试 closedXML 并注意其中的区别。
https://www.codeproject.com/Tips/1107815/Export-an-Excel-File-using-ClosedXML
