Question

我确定了使该过程变慢的代码（我在其中填充单元格）：

我在这里所做的基本上是使用DataSet从数据库中加载一些数据。

Microsoft.Office.Interop.Excel.Range range1 = null;
Microsoft.Office.Interop.Excel.Range cell1 = null;
Microsoft.Office.Interop.Excel.Borders border1 = null;

for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
    int s = i + 1;
    for (j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)
    {
        data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
        xlWorkSheet.Cells[s + 1, j + 1] = data;

        range1 = xlWorkSheet.UsedRange;
        cell1 = range1.Cells[s + 1, j + 1];
        border1 = cell1.Borders;


        if (((IList)terms).Contains(xlWorkSheet.Cells[1, j + 1].Value.ToString()))
        {
            cell1.Interior.Color = System.Drawing.Color.Red;
        }

        range1.Columns.AutoFit();
        range1.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;

        border1.LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
        border1.Weight = 2d;

    }
}

有时加载整个内容大约需要1分钟以上。是否有优化的余地？。

Answer 1

逐个单元是使用Interop与Excel进行交互的最慢的方法-查找如何在一项操作中将数据从数组添加到工作表中。

例如

Write Array to Excel Range

显示了这种方法。

Answer 2

Interop库非常慢，并且花费大量系统资源。

您可以简单地使用OpenXML库来代替使用Interop库来创建Excel文件。我在生产中使用它。超过一百万行只需大约10秒钟即可将数据集导出到excel文件。

以下是引自以下代码的示例代码：

Export DataTable to Excel with Open Xml SDK in c#

private void ExportDSToExcel(DataSet ds, string destination)
{
    using (var workbook = SpreadsheetDocument.Create(destination, DocumentFormat.OpenXml.SpreadsheetDocumentType.Workbook))
    {
        var workbookPart = workbook.AddWorkbookPart();
        workbook.WorkbookPart.Workbook = new DocumentFormat.OpenXml.Spreadsheet.Workbook();
        workbook.WorkbookPart.Workbook.Sheets = new DocumentFormat.OpenXml.Spreadsheet.Sheets();

        uint sheetId = 1;

        foreach (DataTable table in ds.Tables)
        {
            var sheetPart = workbook.WorkbookPart.AddNewPart<WorksheetPart>();
            var sheetData = new DocumentFormat.OpenXml.Spreadsheet.SheetData();
            sheetPart.Worksheet = new DocumentFormat.OpenXml.Spreadsheet.Worksheet(sheetData);                

            DocumentFormat.OpenXml.Spreadsheet.Sheets sheets = workbook.WorkbookPart.Workbook.GetFirstChild<DocumentFormat.OpenXml.Spreadsheet.Sheets>();
            string relationshipId = workbook.WorkbookPart.GetIdOfPart(sheetPart);

            if (sheets.Elements<DocumentFormat.OpenXml.Spreadsheet.Sheet>().Count() > 0)
            {
                sheetId =
                    sheets.Elements<DocumentFormat.OpenXml.Spreadsheet.Sheet>().Select(s => s.SheetId.Value).Max() + 1;
            }

            DocumentFormat.OpenXml.Spreadsheet.Sheet sheet = new DocumentFormat.OpenXml.Spreadsheet.Sheet() { Id = relationshipId, SheetId = sheetId, Name = table.TableName };
            sheets.Append(sheet);

            DocumentFormat.OpenXml.Spreadsheet.Row headerRow = new DocumentFormat.OpenXml.Spreadsheet.Row();

            List<String> columns = new List<string>();
            foreach (DataColumn column in table.Columns)
            {
                columns.Add(column.ColumnName);

                DocumentFormat.OpenXml.Spreadsheet.Cell cell = new DocumentFormat.OpenXml.Spreadsheet.Cell();
                cell.DataType = DocumentFormat.OpenXml.Spreadsheet.CellValues.String;
                cell.CellValue = new DocumentFormat.OpenXml.Spreadsheet.CellValue(column.ColumnName);
                headerRow.AppendChild(cell);
            }

            sheetData.AppendChild(headerRow);

            foreach (DataRow dsrow in table.Rows)
            {
                DocumentFormat.OpenXml.Spreadsheet.Row newRow = new DocumentFormat.OpenXml.Spreadsheet.Row();
                foreach (String col in columns)
                {
                    DocumentFormat.OpenXml.Spreadsheet.Cell cell = new DocumentFormat.OpenXml.Spreadsheet.Cell();
                    cell.DataType = DocumentFormat.OpenXml.Spreadsheet.CellValues.String;
                    cell.CellValue = new DocumentFormat.OpenXml.Spreadsheet.CellValue(dsrow[col].ToString()); //
                    newRow.AppendChild(cell);
                }

                sheetData.AppendChild(newRow);
            }
        }
    }
}

更快创建Excel（互操作）

2 个答案: