使用 asp.net 核心集 header 样式将列表导出到 excel

Question

我正在将数据导出到 excel。我想添加 excel header 颜色和 header 宽度。我尝试了不同的方式但没有工作。请看我下面的功能。我正在使用 asp.net 和 OpenXml 库。这里的任何一位专家都可以提出任何解决方案。谢谢

public byte[] ExportExcelFile<T>(List<T> data, string sheetName)
        {
            var table = ToDataTable(data);
            var memoryStream = new MemoryStream();

            using (var workbook = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook))
            {
                workbook.AddWorkbookPart();

                workbook.WorkbookPart.Workbook = new Workbook();

                workbook.WorkbookPart.Workbook.Sheets = new Sheets();

                var sheetPart = workbook.WorkbookPart.AddNewPart<WorksheetPart>();
                var sheetData = new SheetData();
                sheetPart.Worksheet = new Worksheet(sheetData);

                var sheets = workbook.WorkbookPart.Workbook.GetFirstChild<Sheets>();
                var relationshipId = workbook.WorkbookPart.GetIdOfPart(sheetPart);

                sheets.Append(new Sheet { Id = relationshipId, SheetId = 1, Name = sheetName });

                var headerRow = new Row();

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

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

                sheetData.AppendChild(headerRow);

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

                    sheetData.AppendChild(newRow);
                }

                workbook.Save();
                workbook.Close();
            }

            return memoryStream.ToArray();
        }

Answer 1

您可以参考以下步骤为excel内容添加css样式：

添加样式表。创建一个 GenerateStylesheet class 并包含以下代码：

 private Stylesheet GenerateStylesheet()
 {
     Stylesheet styleSheet = null;

     //Fonts can have one or more Font children which each have different properties like FontSize, Bold, Color, and etc.
     //Here, we add two Font children to the Fonts object. The first one is the default font use by all cells, and the second one is specific to header.
     Fonts fonts = new Fonts(
         new Font( // Index 0 - default
             new FontSize() { Val = 10 }

         ),
         new Font( // Index 1 - header
             new FontSize() { Val = 10 },
             new Bold(),
             new Color() { Rgb = "FFFFFF" }

         ));
     //Fills can have one or more Fill children which you can set its ForegroundColor.
     Fills fills = new Fills(
             new Fill(new PatternFill() { PatternType = PatternValues.None }), // Index 0 - default
             new Fill(new PatternFill() { PatternType = PatternValues.Gray125 }), // Index 1 - default
             new Fill(new PatternFill(new ForegroundColor { Rgb = new HexBinaryValue() { Value = "66666666" } })
             { PatternType = PatternValues.Solid }) // Index 2 - header
         );
     //Borders can have one or more Border children which each defines how the border should look like
     Borders borders = new Borders(
             new Border(), // index 0 default
             new Border( // index 1 black border
                 new LeftBorder(new Color() { Auto = true }) { Style = BorderStyleValues.Thin },
                 new RightBorder(new Color() { Auto = true }) { Style = BorderStyleValues.Thin },
                 new TopBorder(new Color() { Auto = true }) { Style = BorderStyleValues.Thin },
                 new BottomBorder(new Color() { Auto = true }) { Style = BorderStyleValues.Thin },
                 new DiagonalBorder())
         );
     //CellFormats which has one or many CellFormat children. Each CellFormat gets the index of Font, Border, Fill, or etc. 
     CellFormats cellFormats = new CellFormats(
             new CellFormat(), // default
             new CellFormat { FontId = 0, FillId = 0, BorderId = 1, ApplyBorder = true }, // body
             new CellFormat { FontId = 1, FillId = 2, BorderId = 1, ApplyFill = true } // header
         );

     styleSheet = new Stylesheet(fonts, fills, borders, cellFormats);

     return styleSheet;
 }

将样式添加到工作簿。

将 WorkbookStylePart 添加到 WorkbookPart 并初始化其样式表：

 //Add a WorkbookStylePart to the WorkbookPart and initialize its Stylesheet:
 WorkbookStylesPart stylePart = workbook.WorkbookPart.AddNewPart<WorkbookStylesPart>();
 stylePart.Stylesheet = GenerateStylesheet();
 stylePart.Stylesheet.Save();

为单元格添加样式

 foreach (DataColumn column in table.Columns)
 {
     columns.Add(column.ColumnName);

     var cell = new Cell();
     cell.DataType = CellValues.String;
     cell.CellValue = new CellValue(column.ColumnName);
     cell.StyleIndex = 2; //add css style to Cells
     headerRow.AppendChild(cell);
 }

完整的ExportExcelFile代码：

 public byte[] ExportExcelFile<T>(List<T> data, string sheetName)
 {
     var table = ToDataTable(data);
     var memoryStream = new MemoryStream();

     using (var workbook = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook))
     {
         workbook.AddWorkbookPart();

         workbook.WorkbookPart.Workbook = new Workbook();

         workbook.WorkbookPart.Workbook.Sheets = new Sheets();

         //Add a WorkbookStylePart to the WorkbookPart and initialize its Stylesheet:
         WorkbookStylesPart stylePart = workbook.WorkbookPart.AddNewPart<WorkbookStylesPart>();
         stylePart.Stylesheet = GenerateStylesheet();
         stylePart.Stylesheet.Save();

         var sheetPart = workbook.WorkbookPart.AddNewPart<WorksheetPart>();
         var sheetData = new SheetData();
         sheetPart.Worksheet = new Worksheet(sheetData);

         var sheets = workbook.WorkbookPart.Workbook.GetFirstChild<Sheets>();
         var relationshipId = workbook.WorkbookPart.GetIdOfPart(sheetPart);

         sheets.Append(new Sheet { Id = relationshipId, SheetId = 1, Name = sheetName });

         var headerRow = new Row();

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

             var cell = new Cell();
             cell.DataType = CellValues.String;
             cell.CellValue = new CellValue(column.ColumnName);
             cell.StyleIndex = 2; //add css style to Cells
             headerRow.AppendChild(cell);
         }

         sheetData.AppendChild(headerRow);

         foreach (DataRow dsrow in table.Rows)
         {
             var newRow = new Row();
             foreach (var col in columns)
             {
                 var cell = new Cell();
                 cell.DataType = CellValues.String;
                 cell.CellValue = new CellValue(dsrow[col].ToString()); //
                 cell.StyleIndex = 1; //add css style to Cells
                 newRow.AppendChild(cell);
             }

             sheetData.AppendChild(newRow);
         }

         workbook.Save();
         workbook.Close();
     }

     return memoryStream.ToArray();
 }

然后，当导出excel时使用上面的代码：

    public IActionResult Privacy()
    {
        List<Employee> Students = new List<Employee>(){
            new Employee() { Name = "Pradeep", salary = 15000, EmpId = 100 },
             new Employee() { Name = "Smith", salary = 25000, EmpId = 101},
            new Employee() { Name = "John", salary = 21000, EmpId = 102 }
        };

        byte[] result = ExportExcelFile<Employee>(Students, "sheetA");
        return File(result, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Grid.xlsx");
        //return View();
    }

结果如下：

更新：

要设置列宽，您可以按如下方式更新 ExportExcelFile 方法：

    public byte[] ExportExcelFile<T>(List<T> data, string sheetName)
    {
        var table = ToDataTable(data);
        var memoryStream = new MemoryStream();

        using (var workbook = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook))
        {
            WorkbookPart workbookPart = workbook.AddWorkbookPart();
            workbookPart.Workbook = new Workbook();

            WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
            worksheetPart.Worksheet = new Worksheet();

            // Adding style
            WorkbookStylesPart stylePart = workbookPart.AddNewPart<WorkbookStylesPart>();
            stylePart.Stylesheet = GenerateStylesheet();
            stylePart.Stylesheet.Save();

            // Setting up columns
            Columns widthcolumns = new Columns(
                    new Column // first column
                    {
                        Min = 1,
                        Max = 1,
                        Width = 20,
                        CustomWidth = true
                    },
                    new Column // second columns
                    {
                        Min = 2,
                        Max = 3,
                        Width = 15,
                        CustomWidth = true
                    },
                    new Column // third column
                    {
                        Min = 4,
                        Max = 4,
                        Width = 8,
                        CustomWidth = true
                    });

            worksheetPart.Worksheet.AppendChild(widthcolumns);
            Sheets sheets = workbookPart.Workbook.AppendChild(new Sheets());
            Sheet sheet = new Sheet() { Id = workbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = sheetName }; 
            sheets.Append(sheet); 
            workbookPart.Workbook.Save(); 
            SheetData sheetData = worksheetPart.Worksheet.AppendChild(new SheetData());

            var headerRow = new Row();

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

                var cell = new Cell();
                cell.DataType = CellValues.String;
                cell.CellValue = new CellValue(column.ColumnName);
                cell.StyleIndex = 2; //add css style to Cells
                headerRow.AppendChild(cell);
            }

            sheetData.AppendChild(headerRow);

            foreach (DataRow dsrow in table.Rows)
            {
                var newRow = new Row();
                foreach (var col in columns)
                {
                    var cell = new Cell();
                    cell.DataType = CellValues.String;
                    cell.CellValue = new CellValue(dsrow[col].ToString()); //
                    cell.StyleIndex = 1; //add css style to Cells
                    newRow.AppendChild(cell);
                }

                sheetData.AppendChild(newRow);
            }

            workbook.Save();
            workbook.Close();
        }

        return memoryStream.ToArray();
    }

结果如下：

使用 asp.net 核心集 header 样式将列表导出到 excel

Export list to excel using asp.net core set header style

asp.net-core

openxml

export-to-excel