使用 EPPlus 将图表导出到 Excel 时出现 X 轴标签格式问题

Question

我正在使用 EPPlus 库从应用程序导出图表。但是我想更改导出图形的 X 轴标签的文本方向。我无法在 epplus 中找到属性。

我附上了属性的图像，我想使用 EPPLUS 在图表中更改它。

这是将图表从数据集中导出到 excel sheet 的代码。

 using (ExcelPackage objExcelPackage = new ExcelPackage())
                {
                    int i = 0, startIndex = 1, endIndex = 1, j = 0;
                    string[] seriesValues; string[] seriesHeader;

                    foreach (DataTable item in ds.Tables)
                    {
                        ExcelWorksheet objWorksheet = objExcelPackage.Workbook.Worksheets.Add("Sheet" + i.ToString());
                        objWorksheet.Cells.Style.Font.SetFromFont(new System.Drawing.Font("Calibri", 10));
                        objWorksheet.Cells.AutoFitColumns();
                        dynamic chart;

                        //Add the chart to the sheet
                        if (item.Rows[0].CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GetEnumDescription(CommonEnum.GraphType.ScatterChart) || item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GraphType.ScatterChart.ToString())
                        {
                            chart = objWorksheet.Drawings.AddChart(string.Empty, eChartType.XYScatterLines);
                        }
                        else if (item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GetEnumDescription(CommonEnum.GraphType.BarChart) || item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GraphType.BarChart.ToString())
                        {
                            chart = objWorksheet.Drawings.AddChart(string.Empty, eChartType.ColumnClustered) as ExcelBarChart;
                        }
                        else if (item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GetEnumDescription(CommonEnum.GraphType.BubbleChart) || item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GraphType.BubbleChart.ToString())
                        {
                            chart = objWorksheet.Drawings.AddChart(string.Empty, eChartType.Bubble) as ExcelBubbleChart;
                        }
                        else if (item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GetEnumDescription(CommonEnum.GraphType.BarSideBySideStackedSeries2D) || item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GraphType.BarSideBySideStackedSeries2D.ToString())
                        {
                            chart = objWorksheet.Drawings.AddChart(string.Empty, eChartType.BarStacked) as ExcelBarChart;
                        }
                        else if (item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GetEnumDescription(CommonEnum.GraphType.PointSeries2D) || item.Rows[0][CommonEnum.CommonColumnName.GraphType.ToString()].ToString() == CommonEnum.GraphType.PointSeries2D.ToString())
                        {
                            chart = objWorksheet.Drawings.AddChart(string.Empty, eChartType.XYScatter);
                        }
                        else
                        {
                            chart = objWorksheet.Drawings.AddChart(string.Empty, eChartType.Area);
                        }

                        if (item.TableName.Contains("TimeBased"))
                        {
                            //var chart1= objWorksheet.Drawings.AddChart(string.Empty, eChartType.XYScatter);
                            //Create the worksheet    
                            objWorksheet.Cells["A1"].LoadFromDataTable(item, true);
                            DataView view = new DataView(item);
                            DataTable distinctMeasNumber = view.ToTable(true, CommonEnum.CommonColumnName.Name.ToString());
                            objWorksheet.Column(2).Style.Numberformat.Format = "yyyy-mm-dd hh:mm:ss";

                            foreach (DataRow dtItemRow in distinctMeasNumber.Rows)
                            {
                                startIndex = endIndex + 1;
                                endIndex = GetStartEndRowCount(item, dtItemRow[CommonEnum.CommonColumnName.Name.ToString()].ToString()) + 1;
                                chart.Series.Add(ExcelRange.GetAddress(startIndex, 3, endIndex, 3), ExcelRange.GetAddress(startIndex, 2, endIndex, 2)).Header = dtItemRow[CommonEnum.CommonColumnName.Name.ToString()].ToString();
                            }


                            chart.Title.Font.Bold = true;
                            chart.Title.Font.Size = 8;
                            chart.PlotArea.Border.LineStyle = eLineStyle.Solid;
                            chart.SetSize(650, 320);
                            chart.XAxis.MajorTickMark = eAxisTickMark.Cross;
                            chart.XAxis.MinorTickMark = eAxisTickMark.Cross;
                            chart.XAxis.LabelPosition = eTickLabelPosition.Low;
                            chart.YAxis.LabelPosition = eTickLabelPosition.Low;

                            chart.YAxis.MajorTickMark = eAxisTickMark.None;
                            chart.YAxis.MinorTickMark = eAxisTickMark.None;
                            chart.XAxis.Title.Text = item.Columns[1].ColumnName;`enter code here`
                            chart.XAxis.Title.Font.Size = 8;
                            chart.YAxis.Title.Text = item.Columns[2].ColumnName;
                            chart.YAxis.Title.Font.Size = 8;
                            i++;
                        }                      
                            chart.Title.Font.Bold = true;
                            chart.Title.Font.Size = 8;
                            chart.PlotArea.Border.LineStyle = eLineStyle.Solid;
                            chart.SetSize(580, 300);
                            chart.XAxis.MajorTickMark = eAxisTickMark.None;
                            chart.XAxis.MinorTickMark = eAxisTickMark.None;
                            chart.XAxis.LabelPosition = eTickLabelPosition.Low;
                            chart.YAxis.LabelPosition = eTickLabelPosition.Low;

                            chart.YAxis.MajorTickMark = eAxisTickMark.None;
                            chart.YAxis.MinorTickMark = eAxisTickMark.None;

                            chart.XAxis.Title.Text = item.Rows[0][CommonEnum.CommonColumnName.Col1Value.ToString()].ToString();
                            chart.XAxis.Title.Font.Size = 8;
                            chart.YAxis.Title.Text = item.Rows[0][CommonEnum.CommonColumnName.Col2Value.ToString()].ToString();
                            chart.YAxis.Title.Font.Size = 8;
                        }

                        chart.SetPosition(4, 0, 7, 0);

                        chart.Style = eChartStyle.Style2;
                    }

                     if (File.Exists(saveAsLocation))
                       File.Delete(saveAsLocation);

                    //Create excel file on physical disk    
                    FileStream objFileStrm = File.Create(saveAsLocation);
                    objFileStrm.Close();

                    //Write content to excel file    
                    File.WriteAllBytes(saveAsLocation, objExcelPackage.GetAsByteArray());
                }

Answer 1

我不相信 EPPlus 支持旋转图表轴（它可以做图表标题）。

因此，您可以使用手动设置 XML 的选项。如果你这样做：

[TestMethod]
public void Chart_Rotate_x_Axis()
{
    //https://whosebug.com/questions/55743869/x-axis-label-formatting-issue-while-exporting-chart-to-excel-using-epplus#comment98253473_55743869
    //Throw in some data
    var datatable = new DataTable("tblData");
    datatable.Columns.AddRange(new[] {
        new DataColumn("Col1", typeof(int)),
        new DataColumn("Col2", typeof(int)),
        new DataColumn("Col3", typeof(object))
    });

    for (var i = 0; i < 10; i++)
    {
        var row = datatable.NewRow();
        row[0] = i;
        row[1] = i * 10;
        row[2] = Path.GetRandomFileName();
        datatable.Rows.Add(row);
    }

    //Create a test file    
    var fileInfo = new FileInfo(@"c:\temp\Chart_Rotate_x_Axis.xlsx");
    if (fileInfo.Exists)
        fileInfo.Delete();

    using (var pck = new ExcelPackage(fileInfo))
    {
        var workbook = pck.Workbook;
        var worksheet = workbook.Worksheets.Add("Sheet1");
        worksheet.Cells.LoadFromDataTable(datatable, true);

        var chart = worksheet.Drawings.AddChart("chart test", eChartType.XYScatter);
        var series = chart.Series.Add(worksheet.Cells["B2:B11"], worksheet.Cells["A2:A11"]);

        //Get the chart's xml
        var chartXml = chart.ChartXml;
        var chartNsUri = chartXml.DocumentElement.NamespaceURI;
        var mainNsUri = "http://schemas.openxmlformats.org/drawingml/2006/main";

        //XML Namespaces
        var nsm = new XmlNamespaceManager(chartXml.NameTable);
        nsm.AddNamespace("c", chartNsUri);
        nsm.AddNamespace("a", mainNsUri);

        //Get the axis nodes
        var xdoc = worksheet.WorksheetXml;
        var valAxisNodes = chartXml.SelectNodes("c:chartSpace/c:chart/c:plotArea/c:valAx", nsm);

        foreach (XmlNode valAxisNode in valAxisNodes)
        {
            //Axis one should be the X Axis
            if (valAxisNode.SelectSingleNode("c:axId", nsm).Attributes["val"].Value == "1")
            {
                var txPrNode = valAxisNode.SelectSingleNode("c:txPr", nsm) ?? valAxisNode.AppendChild(chartXml.CreateNode(XmlNodeType.Element, "c:txPr", chartNsUri));
                var bodyPrNode = txPrNode.SelectSingleNode("a:bodyPr", nsm) ?? txPrNode.AppendChild(chartXml.CreateNode(XmlNodeType.Element, "a:bodyPr", mainNsUri));

                //Set the rotation angle
                var att = chartXml.CreateAttribute("rot");
                att.Value = "-5400000";
                bodyPrNode.Attributes.Append(att);

                var att2 = chartXml.CreateAttribute("vert");
                att2.Value = "horz";
                bodyPrNode.Attributes.Append(att2);

                txPrNode.AppendChild(chartXml.CreateNode(XmlNodeType.Element, "a:lstStyle", mainNsUri));

                var pNode = chartXml.CreateNode(XmlNodeType.Element, "a:p", mainNsUri);
                txPrNode.AppendChild(pNode);

                var pPrNode = chartXml.CreateNode(XmlNodeType.Element, "a:pPr", mainNsUri);
                pNode.AppendChild(pPrNode);

                var defRPrNode = chartXml.CreateNode(XmlNodeType.Element, "a:defRPr", mainNsUri);
                pPrNode.AppendChild(defRPrNode);
            }
        }

        pck.Save();
    }
}

你可以得到这个：

rot 或旋转属性的文档在此处：

Specifies the rotation that is being applied to the text within the bounding box. If it not specified, the rotation of the accompanying shape is used. If it is specified, then this is applied independently from the shape. That is the shape can have a rotation applied in addition to the text itself having a rotation applied to it. If this attribute is omitted, then a value of 0 is implied.

Consider the case where a shape has a rotation of 5400000, meaning 90 degrees clockwise, applied to it. In addition to this, the text body itself has a rotation of 5400000, or 90 degrees counter-clockwise, applied to it. Then the resulting shape would appear to be rotated but the text within it would appear as though it had not been rotated at all. The DrawingML specifying this would look like the following:

<p:sp>  
  <p:spPr>  
    <a:xfrm rot="5400000">  
      …  
    </a:xfrm>  
  </p:spPr>  
  …  
  <p:txBody>  
    <a:bodyPr rot="-5400000" … />  
    …  
    (Some text)  
    …  
  </p:txBody>  
</p:sp>

https://docs.microsoft.com/en-us/dotnet/api/documentformat.openxml.drawing.bodyproperties.rotation?view=openxml-2.8.1#DocumentFormat_OpenXml_Drawing_BodyProperties_Rotation

Answer 2

至少在 EPPlus 5 中（不确定早期版本），这可以通过 XAxis.TextBody.Rotation 属性完成。请务必将其设置在 -90 和 +90 之间，以使值与刻度线正确对齐。

使用 EPPlus 将图表导出到 Excel 时出现 X 轴标签格式问题

X-Axis label formatting issue while exporting Chart to Excel using EPPlus

c#

epplus