DataSet 导出到 xls文件

找到的 DataSet 导出 Excel 的代码, 效率之高令人侧目, 导出6W行的一个Excel竟然只要20s(亲测,不过数据不同速度应该不同)

代码存根:

        public static void ExportToExcel(DataSet dataSet, string outputPath)
        {
            // Create the Excel Application object
            ApplicationClass excelApp = new ApplicationClass();

            // Create a new Excel Workbook
            Workbook excelWorkbook = excelApp.Workbooks.Add(Type.Missing);

            int sheetIndex = 0;

            // Copy each DataTable
            foreach (System.Data.DataTable dt in dataSet.Tables)
            {

                // Copy the DataTable to an object array
                object[,] rawData = new object[dt.Rows.Count + 1, dt.Columns.Count];

                // Copy the column names to the first row of the object array
                for (int col = 0; col < dt.Columns.Count; col++)
                {
                    // 在这里可以把标题的名字改掉
                    rawData[0, col] = dt.Columns[col].ColumnName;      
                }

                // Copy the values to the object array
                for (int col = 0; col < dt.Columns.Count; col++)
                {
                    for (int row = 0; row < dt.Rows.Count; row++)
                    {
                        rawData[row + 1, col] = "'" + dt.Rows[row].ItemArray[col];
                    }
                }

                // Calculate the final column letter
                string finalColLetter = string.Empty;
                string colCharset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                int colCharsetLen = colCharset.Length;

                if (dt.Columns.Count > colCharsetLen)
                {
                    finalColLetter = colCharset.Substring(
                        (dt.Columns.Count - 1) / colCharsetLen - 1, 1);
                }

                finalColLetter += colCharset.Substring(
                        (dt.Columns.Count - 1) % colCharsetLen, 1);

                // Create a new Sheet
                Worksheet excelSheet = (Worksheet)excelWorkbook.Sheets.Add(
                    excelWorkbook.Sheets.get_Item(++sheetIndex),
                    Type.Missing, 1, XlSheetType.xlWorksheet);

                excelSheet.Name = dt.TableName;

                // Fast data export to Excel
                string excelRange = string.Format("A1:{0}{1}",
                    finalColLetter, dt.Rows.Count + 1);

                excelSheet.get_Range(excelRange, Type.Missing).Value2 = rawData;

                // Mark the first row as BOLD
                ((Range)excelSheet.Rows[1, Type.Missing]).Font.Bold = true;
            }

            // Save and Close the Workbook
            excelWorkbook.SaveAs(outputPath, XlFileFormat.xlWorkbookNormal, Type.Missing,
                Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlExclusive,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            excelWorkbook.Close(true, Type.Missing, Type.Missing);
            excelWorkbook = null;

            // Release the Application object
            excelApp.Quit();
            excelApp = null;

            // Collect the unreferenced objects
            GC.Collect();
            GC.WaitForPendingFinalizers();

        }