Xamarin.Forms 导出Excel

导入NuGet里的DocumentFormat.OpenXml

添加数据

public static async System.Threading.Tasks.Task<string> ExportDataToExcelAsync(HistoricalDataListViewModel viewModel, string fileName)        {
            string path = "";
            if (viewModel == null) return "";
            // Granted storage permission
            var storageStatus = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Storage);

            if (storageStatus != PermissionStatus.Granted)
            {
                var results = await CrossPermissions.Current.RequestPermissionsAsync(new[] { Permission.Storage });
                storageStatus = results[Permission.Storage];
            }

            if (viewModel.Datas.Count > 0)
            {
                try
                {
                    path = DependencyService.Get<IExportFilesToLocation>().GetFolderLocation() + fileName + ".xlsx";
                    using (SpreadsheetDocument document = SpreadsheetDocument.Create(path, SpreadsheetDocumentType.Workbook))
                    {
                        WorkbookPart workbookPart = document.AddWorkbookPart();
                        workbookPart.Workbook = new Workbook();

                        WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
                        worksheetPart.Worksheet = new Worksheet();
                        Sheets sheets = workbookPart.Workbook.AppendChild(new Sheets());
                        Sheet sheet = new Sheet() { Id = workbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = "数据列表" };
                        sheets.Append(sheet);

                        #region 样式
                        WorkbookStylesPart stylepart = workbookPart.AddNewPart<WorkbookStylesPart>();

                        stylepart.Stylesheet = new Stylesheet();

                        SetStyle(stylepart);
                        #endregion

                        workbookPart.Workbook.Save();

                        Columns columns = new Columns();
                        columns.AppendChild(new Column()
                        {
                            Min = 1,
                            Max = (UInt32)viewModel.Datas.First().ModelList.Count(x => x.IsVisibility),
                            CustomWidth = true,
                            Width = (DoubleValue)20
                        });
                        worksheetPart.Worksheet.Append(columns);

                        SheetData sheetData = worksheetPart.Worksheet.AppendChild(new SheetData());
                        // Constructing header
                        Row row = new Row();
                        row.Append(viewModel.Datas.First().ModelList.Where(x=>x.IsVisibility).OrderBy(x=>x.OrderId).Select(x =>
                        new DocumentFormat.OpenXml.Spreadsheet.Cell()
                        {
                            CellValue = new CellValue(x.ChineseName+(String.IsNullOrEmpty(x.Unit)?"":String.Format("({0})",x.Unit))),
                            DataType = new EnumValue<CellValues>(CellValues.String),
                            StyleIndex = 3
                        }));

                        // Insert the header row to the Sheet Data
                        sheetData.AppendChild(row);

                        // Add each product
                        foreach (var d in viewModel.Datas)
                        {
                            row = new Row();
                            row.Append(d.ModelList.Where(x => x.IsVisibility).OrderBy(x => x.OrderId).Select(x =>
                                new DocumentFormat.OpenXml.Spreadsheet.Cell()
                                {
                                    CellValue = new CellValue(x.Display),
                                    DataType = new EnumValue<CellValues>((x.DataType == 0 && x.Name != "nDate") ? CellValues.Number : CellValues.String),
                                    StyleIndex = 3
                                }));
                            sheetData.AppendChild(row);
                        }
                        worksheetPart.Worksheet.Save();
                    }
                }
                catch (Exception ex)
                {
                    Xamarin.Forms.MessagingCenter.Send<SystemLog>(new SystemLog() { Type = "错误信息", Log = ex.ToString(), Time = DateTime.Now }, "SystemLog");
                    path = "";

                }
            }
            return path;

        }

设置样式（字体大小 居中等）

        private static void SetStyle(WorkbookStylesPart stylesPart)
        {
            //添加SheetStyle：FontBorderFill字体居中
            Fonts fonts = new Fonts() { Count = (UInt32Value)2U, KnownFonts = true };
            //fontId = 0
            DocumentFormat.OpenXml.Spreadsheet.Font font = new DocumentFormat.OpenXml.Spreadsheet.Font();
            DocumentFormat.OpenXml.Spreadsheet.FontSize fontSize = new DocumentFormat.OpenXml.Spreadsheet.FontSize() { Val = 12D };
            FontFamilyNumbering fontFamilyNumbering = new FontFamilyNumbering() { Val = 1 };
            FontScheme fontScheme = new FontScheme() { Val = FontSchemeValues.Minor };
            font.Append(fontSize);
            font.Append(fontFamilyNumbering);
            font.Append(fontScheme);
            fonts.Append(font);
            //fontId = 1
            font = new DocumentFormat.OpenXml.Spreadsheet.Font();
            Bold bold = new Bold();
            fontSize = new DocumentFormat.OpenXml.Spreadsheet.FontSize() { Val = 26D };
            fontFamilyNumbering = new FontFamilyNumbering() { Val = 1 };
            fontScheme = new FontScheme() { Val = FontSchemeValues.Minor };
            font.Append(bold);
            font.Append(fontSize);
            font.Append(fontFamilyNumbering);
            font.Append(fontScheme);
            fonts.Append(font);
            stylesPart.Stylesheet.Append(fonts);

            Fills fills = new Fills() { Count = (UInt32Value)3U };
            //FillId = 0
            Fill fill = new Fill();
            PatternFill patternFill = new PatternFill() { PatternType = PatternValues.None };
            fill.Append(patternFill);
            fills.Append(fill);
            //FillId = 1
            fill = new Fill();
            patternFill = new PatternFill() { PatternType = PatternValues.Gray125 };
            fill.Append(patternFill);
            fills.Append(fill);
            //FillId = 2
            fill = new Fill();
            patternFill = new PatternFill() { PatternType = PatternValues.Solid };
            ForegroundColor foregroundColor = new ForegroundColor() { Rgb = "FF87ceeb" };
            BackgroundColor backgroundColor = new BackgroundColor() { Indexed = (UInt32Value)64U };
            patternFill.Append(foregroundColor);
            patternFill.Append(backgroundColor);
            fill.Append(patternFill);
            fills.Append(fill);
            stylesPart.Stylesheet.Append(fills);

            Borders borders = new Borders() { Count = (UInt32Value)2U };
            //BorderId = 0
            Border border = new Border();
            LeftBorder leftBorder = new LeftBorder();
            RightBorder rightBorder = new RightBorder();
            TopBorder topBorder = new TopBorder();
            BottomBorder bottomBorder = new BottomBorder();
            DiagonalBorder diagonalBorder = new DiagonalBorder();
            border.Append(leftBorder);
            border.Append(rightBorder);
            border.Append(topBorder);
            border.Append(bottomBorder);
            border.Append(diagonalBorder);
            borders.Append(border);
            //BorderId = 1
            border = new Border();
            leftBorder = new LeftBorder() { Style = BorderStyleValues.Thin };
            rightBorder = new RightBorder() { Style = BorderStyleValues.Thin };
            topBorder = new TopBorder() { Style = BorderStyleValues.Thin };
            bottomBorder = new BottomBorder() { Style = BorderStyleValues.Thin };
            DocumentFormat.OpenXml.Spreadsheet.Color color = new DocumentFormat.OpenXml.Spreadsheet.Color() { Indexed = (UInt32Value)64U };
            leftBorder.Append(color);
            color = new DocumentFormat.OpenXml.Spreadsheet.Color() { Indexed = (UInt32Value)64U };
            rightBorder.Append(color);
            color = new DocumentFormat.OpenXml.Spreadsheet.Color() { Indexed = (UInt32Value)64U };
            topBorder.Append(color);
            color = new DocumentFormat.OpenXml.Spreadsheet.Color() { Indexed = (UInt32Value)64U };
            bottomBorder.Append(color);
            diagonalBorder = new DiagonalBorder();
            border.Append(leftBorder);
            border.Append(rightBorder);
            border.Append(topBorder);
            border.Append(bottomBorder);
            border.Append(diagonalBorder);
            borders.Append(border);
            stylesPart.Stylesheet.Append(borders);

            //StyleIndex = 0;
            CellFormats cellFormats = new CellFormats() { Count = (UInt32Value)5U };
            CellFormat cellFormat = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)0U, FillId = (UInt32Value)0U, BorderId = (UInt32Value)0U, FormatId = (UInt32Value)0U };
            Alignment alignment = new Alignment() { Vertical = VerticalAlignmentValues.Center };
            cellFormat.Append(alignment);
            cellFormats.Append(cellFormat);
            //StyleIndex = 1;
            cellFormat = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)0U, FillId = (UInt32Value)2U, BorderId = (UInt32Value)0U, FormatId = (UInt32Value)0U, ApplyFont = true, ApplyFill = true, ApplyBorder = true, ApplyAlignment = true };
            alignment = new Alignment() { Vertical = VerticalAlignmentValues.Center };
            cellFormat.Append(alignment);
            cellFormats.Append(cellFormat);
            //StyleIndex = 2;
            cellFormat = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)1U, FillId = (UInt32Value)2U, BorderId = (UInt32Value)0U, FormatId = (UInt32Value)0U, ApplyFont = true, ApplyFill = true, ApplyBorder = true, ApplyAlignment = true };
            alignment = new Alignment() { Horizontal = HorizontalAlignmentValues.Center, Vertical = VerticalAlignmentValues.Center };
            cellFormat.Append(alignment);
            cellFormats.Append(cellFormat);
            //StyleIndex = 3;
            cellFormat = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)0U, FillId = (UInt32Value)0, BorderId = (UInt32Value)1U, FormatId = (UInt32Value)0U, ApplyFont = true, ApplyFill = true, ApplyBorder = true, ApplyAlignment = true };
            alignment = new Alignment() { Horizontal = HorizontalAlignmentValues.Center, Vertical = VerticalAlignmentValues.Center };
            cellFormat.Append(alignment);
            cellFormats.Append(cellFormat);
            //StyleIndex = 4;
            cellFormat = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)0U, FillId = (UInt32Value)0, BorderId = (UInt32Value)0U, FormatId = (UInt32Value)0U, ApplyFont = true, ApplyFill = true, ApplyBorder = true, ApplyAlignment = true };
            cellFormats.Append(cellFormat);

            stylesPart.Stylesheet.Append(cellFormats);

            stylesPart.Stylesheet.Save();
        }