将网格线添加到NPOI条形图中的y轴

using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.SS.Util;

// 创建Workbook和Sheet对象
IWorkbook workbook = new XSSFWorkbook();
ISheet sheet = workbook.CreateSheet("Bar Chart");

// 创建Chart对象
IChart chart = sheet.CreateChart(ChartType.BarClustered);

// 创建y轴
IChartAxis yAxis = chart.CreateValueAxis(AxisPosition.Left);
yAxis.AxisOptions.MajorGridlines = true; // 显示主要网格线

// 创建数据源
IChartDataSource<double> dataSource = DataSources.FromArray(new double[] { 10, 20, 30, 40, 50 });

// 设置数据源
chart.SetData(dataSource);

// 将Chart对象插入到Sheet中
IDrawing drawing = sheet.CreateDrawingPatriarch();
IClientAnchor anchor = drawing.CreateAnchor(0, 0, 0, 0, 0, 5, 10, 15); // 设置图表位置
chart.Plot(anchor);

// 保存Workbook到文件
using (FileStream file = new FileStream("BarChart.xlsx", FileMode.Create))
{
    workbook.Write(file);
}