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默認情況下，創建圖表時，Excel會自動設置其座標軸屬性。這些屬性包括座標軸選項，例如邊界最大值，邊界最小值，主要單位，次要單位；刻度線標記的主要類型，次要類型；標籤位置；橫座標軸交叉設置；是否逆序刻度值等。但是有時我們需要手動設置這些屬性來完善和美化圖表。本文將介紹如何使用Spire.XLS自定義設置Excel圖表座標軸格式。
代碼段：
//創建Workbook對象，獲取第一個工作表
Workbook workbook = new Workbook();
workbook.CreateEmptySheets(1);
Worksheet sheet = workbook.Worksheets[0];
//添加示例數據
sheet.Name = "Demo";
sheet.Range["A1"].Value = "Month";
sheet.Range["A2"].Value = "Jan";
sheet.Range["A3"].Value = "Feb";
sheet.Range["A4"].Value = "Mar";
sheet.Range["A5"].Value = "Apr";
sheet.Range["A6"].Value = "May";
sheet.Range["A7"].Value = "Jun";
sheet.Range["A8"].Value = "Jul";
sheet.Range["A9"].Value = "Aug";
sheet.Range["B1"].Value = "Planned";
sheet.Range["B2"].NumberValue = 38;
sheet.Range["B3"].NumberValue = 47;
sheet.Range["B4"].NumberValue = 39;
sheet.Range["B5"].NumberValue = 36;
sheet.Range["B6"].NumberValue = 27;
sheet.Range["B7"].NumberValue = 25;
sheet.Range["B8"].NumberValue = 36;
sheet.Range["B9"].NumberValue = 48;
//根據示例數據創建柱形圖
Chart chart = sheet.Charts.Add(ExcelChartType.ColumnClustered);
chart.DataRange = sheet.Range["B1:B9"];
chart.SeriesDataFromRange = false;
chart.PlotArea.Visible = false;
chart.TopRow = 6;
chart.BottomRow = 25;
chart.LeftColumn = 2;
chart.RightColumn = 9;
chart.ChartTitle = "Chart with Customized Axis";
chart.ChartTitleArea.IsBold = true;
chart.ChartTitleArea.Size = 12;
Spire.Xls.Charts.ChartSerie cs1 = chart.Series[0];
cs1.CategoryLabels = sheet.Range["A2:A9"];
//自定義設置圖表座標軸屬性
chart.PrimaryValueAxis.MajorUnit = 8;
chart.PrimaryValueAxis.MinorUnit = 2;
chart.PrimaryValueAxis.MaxValue = 50;
chart.PrimaryValueAxis.MinValue = 0;
chart.PrimaryValueAxis.IsReverseOrder = false;
chart.PrimaryValueAxis.MajorTickMark = TickMarkType.TickMarkOutside;
chart.PrimaryValueAxis.MinorTickMark = TickMarkType.TickMarkInside;
chart.PrimaryValueAxis.TickLabelPosition = TickLabelPositionType.TickLabelPositionNextToAxis;
chart.PrimaryValueAxis.CrossesAt = 0;
//保存文檔
workbook.SaveToFile("Result.xlsx", ExcelVersion.Version2010);
效果圖：
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