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默认情况下，创建图表时，Excel会自动设置其座标轴属性。这些属性包括座标轴选项，例如边界最大值，边界最小值，主要单位，次要单位；刻度线标记的主要类型，次要类型；标签位置；横座标轴交叉设置；是否逆序刻度值等。但是有时我们需要手动设置这些属性来完善和美化图表。本文将介绍如何使用Spire.XLS自定义设置Excel图表座标轴格式。
代码段：
//创建Workbook对象，获取第一个工作表
Workbook workbook = new Workbook();
workbook.CreateEmptySheets(1);
Worksheet sheet = workbook.Worksheets[0];
//添加示例数据
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;
//根据示例数据创建柱形图
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"];
//自定义设置图表座标轴属性
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;
//保存文档
workbook.SaveToFile("Result.xlsx", ExcelVersion.Version2010);
效果图：
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