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NPOI 2.2.1版本随着NPOI的使用，如何在excel中绘制图表轴？
以下是用折线图生成excel的示例代码，但生成图表时没有坐标轴。
bottomAxis的属性（IsVisible）已为true，但仍无法看到它。
我的问题是如何使这些轴可见？
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
Dim wb As IWorkbook = New XSSFWorkbook()
Dim ws As ISheet = wb.createSheet("linechart")
Dim NUM_OF_ROWS = 3
Dim NUM_OF_COLUMNS = 10
For rowIndex As Integer = 0 To NUM_OF_ROWS
Dim row = ws.CreateRow(rowIndex + 1)
For colIndex As Integer = 0 To NUM_OF_COLUMNS
Dim cell = ws.GetRow(rowIndex + 1).CreateCell(colIndex)
cell.setCellValue(colIndex * (rowIndex + 1))
Next
Next
Dim drawing = ws.createDrawingPatriarch()
Dim anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 10, 15)
Dim chart As IChart = drawing.createChart(anchor)
Dim legend = chart.getOrCreateLegend()
Dim dataFactory = chart.ChartDataFactory
Dim chartAxisFactory = chart.ChartAxisFactory
Dim lineChartData = dataFactory.createLineChartData(Of Double, Double)()
Dim bottomAxis = chartAxisFactory.createCategoryAxis(NPOI.SS.UserModel.Charts.AxisPosition.BOTTOM)
Dim leftAxis = chartAxisFactory.createValueAxis(NPOI.SS.UserModel.Charts.AxisPosition.RIGHT)
Dim xs = NPOI.SS.UserModel.charts.DataSources.fromNumericCellRange(ws, New NPOI.SS.Util.CellRangeAddress(0, 0, 0, NUM_OF_COLUMNS - 1))
Dim ys1 = NPOI.SS.UserModel.charts.DataSources.fromNumericCellRange(ws, New NPOI.SS.Util.CellRangeAddress(1, 1, 0, NUM_OF_COLUMNS - 1))
Dim ys2 = NPOI.SS.UserModel.charts.DataSources.fromNumericCellRange(ws, New NPOI.SS.Util.CellRangeAddress(2, 2, 0, NUM_OF_COLUMNS - 1))
lineChartData.addSeries(xs, ys1)
lineChartData.addSeries(xs, ys2)
chart.plot(lineChartData, bottomAxis, leftAxis)
Dim file As FileStream = New FileStream("D:/feed//Xiaohongshu/" & "test" & ".xlsx", FileMode.Create)
wb.Write(file)
file.Close()
End Sub