DataGridView如何快速导出Excel

从DataGridView或DataTable导出Excel文件，为了按照数据类型设置单元格格式，导出Excel时速度都比较慢，一直找不到好的办法。

最后从外文网站上找到解决办法，使用ws.get_Range(excelRange, Type.Missing).Value2方法批量设置单元格的值。详细代码如下：

    public void DataToExcelFast(DataGridView dgv, string fName)
    {
        try
        {
            Excel.Application excel = new Excel.Application();
            Excel.Workbook wb = excel.Workbooks.Add(true);
            Excel.Worksheet ws = (Excel.Worksheet)wb.ActiveSheet;
            ws.Name = fName;
            string sFile = string.Empty;
            SaveFileDialog dialog = new SaveFileDialog();
            dialog.Title = "Save export file";
            dialog.Filter = "EXECL File(*.xlsx) |.xlsx";
            dialog.FileName = fName;
            dialog.FilterIndex = ;
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                string FileName = dialog.FileName;
                if (File.Exists(FileName))
                    File.Delete(FileName);
                sFile = FileName;
                excel.Visible = false;
                excel.DisplayAlerts = false;
                excel.Calculation = Excel.XlCalculation.xlCalculationManual;
                ArrayList cols = new ArrayList();
                #region 列标题，并根据列的数据类型设置Excel列的格式
                int visibleColumnCount = ;
                foreach (DataGridViewColumn col in dgv.Columns)
                {
                    if (col.Visible)
                    {
                        visibleColumnCount++;
                        ws.Cells[, visibleColumnCount].Value2 = col.HeaderText.ToString();
                        ws.Cells[, visibleColumnCount].Font.Bold = true;
                        cols.Add(col.Name);
                        if (col.ValueType != null)
                        {
                            if (col.ValueType.Name.Equals("DateTime"))
                            {
                                ws.Columns[visibleColumnCount].NumberFormatLocal = @"yyyy-mm-dd HH:mm";
                                ws.Columns[visibleColumnCount].Font.Color
                                    = System.Drawing.ColorTranslator.ToOle(Color.Blue);
                            }
                            else if (col.ValueType.Name.Equals("Decimal")
                                || col.ValueType.Name.Equals("Double"))
                            {
                                ws.Columns[visibleColumnCount].NumberFormat = "0.00";
                            }
                            else if (col.ValueType.Name.Equals("Int32"))
                            {
                                ws.Columns[visibleColumnCount].NumberFormat = "";
                            }
                            else
                            {
                                ws.Columns[visibleColumnCount].NumberFormatLocal = @"@";
                            }
                        }
                        else
                            ws.Columns[visibleColumnCount].NumberFormatLocal = @"@";
                    }
                }
                #endregion
                #region 写入行
                // Copy each DataTable
                // Copy the DataTable to an object array
                object[,] rawData = new object[dgv.Rows.Count, cols.Count];
                // Copy the column names to the first row of the object array
                for (int col = ; col < cols.Count; col++)
                {
                    rawData[, col] = cols[col];
                }
                // Copy the values to the object array
                for (int col = ; col < cols.Count; col++)
                {
                    for (int row = ; row < dgv.Rows.Count; row++)
                    {
                        rawData[row, col] = dgv.Rows[row].Cells[cols[col].ToString()].Value;
                    }
                }
                // Calculate the final column letter
                string finalColLetter = string.Empty;
                string colCharset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                int colCharsetLen = colCharset.Length;
                if (cols.Count > colCharsetLen)
                {
                    finalColLetter = colCharset.Substring(
                        (cols.Count - ) / colCharsetLen - , );
                }
                finalColLetter += colCharset.Substring(
                        (cols.Count - ) % colCharsetLen, );
                // Fast data export to Excel
                string excelRange = string.Format("A2:{0}{1}",
                    finalColLetter, dgv.Rows.Count + );
                ws.get_Range(excelRange, Type.Missing).Value2 = rawData;
                #endregion
                excel.Calculation = Excel.XlCalculation.xlCalculationAutomatic;
                // 51表示2007-2010格式的xlsx
                ws.SaveAs(FileName, , Type.Missing, Type.Missing,
                    Type.Missing, Type.Missing,
                    Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,
                    Type.Missing, Type.Missing, Type.Missing);
                wb.Close(true, Type.Missing, Type.Missing);
                excel.Quit();
                // 安全回收进程
                System.GC.GetGeneration(excel);
                if (MessageBox.Show("已经导出Excel,您是否要打开？", "提示",
                     MessageBoxButtons.YesNo) == DialogResult.Yes)
                    System.Diagnostics.Process.Start(FileName);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("导出Excel时遇到错误\r\n" + ex.Message,
            "Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
        }
    }