.NetCore下使用NPOI繪製統計圖表

柱狀圖

class Program
    {
        const int NUM_OF_ROWS = 3;
        const int NUM_OF_COLUMNS = 10;
        static void Main(string[] args)
        {
            IWorkbook wb = new XSSFWorkbook();
            ISheet sheet = wb.CreateSheet("linechart");

            // Create a row and put some cells in it. Rows are 0 based.
            IRow row;
            ICell cell;
            for (int rowIndex = 0; rowIndex < NUM_OF_ROWS; rowIndex++)
            {
                row = sheet.CreateRow((short)rowIndex);
                for (int colIndex = 0; colIndex < NUM_OF_COLUMNS; colIndex++)
                {
                    cell = row.CreateCell((short)colIndex);
                    cell.SetCellValue(colIndex * (rowIndex + 1));
                }
            }

            IDrawing drawing = sheet.CreateDrawingPatriarch();
            IClientAnchor anchor1 = drawing.CreateAnchor(0, 0, 0, 0, 0, 5, 10, 15);
            CreateChart(drawing, sheet, anchor1, "title1", "title2");
            IClientAnchor anchor2 = drawing.CreateAnchor(0, 0, 0, 0, 0, 20, 10, 35);
            CreateChart(drawing, sheet, anchor2, "s1", "s2");
            using (FileStream fs = File.Create("test5.xlsx"))
            {
                wb.Write(fs);
            }
        }

        static void CreateChart(IDrawing drawing, ISheet sheet, IClientAnchor anchor, string serie1, string serie2)
        {
            IChart chart = drawing.CreateChart(anchor);
            IChartLegend legend = chart.GetOrCreateLegend();
            //標題位置
            legend.Position = LegendPosition.Top;

            IBarChartData<double, double> data = chart.ChartDataFactory.CreateBarChartData<double, double>();

            // Use a category axis for the bottom axis.
            //橫座標
            IChartAxis bottomAxis = chart.ChartAxisFactory.CreateCategoryAxis(AxisPosition.Bottom);
            //縱座標
            IValueAxis leftAxis = chart.ChartAxisFactory.CreateValueAxis(AxisPosition.Left);
            leftAxis.Crosses = AxisCrosses.AutoZero;//AxisCrosses.Max 則縱座標在右側
            IChartDataSource<double> xs = DataSources.FromNumericCellRange(sheet, new CellRangeAddress(0, 0, 0, NUM_OF_COLUMNS - 1));
            IChartDataSource<double> ys1 = DataSources.FromNumericCellRange(sheet, new CellRangeAddress(1, 1, 0, NUM_OF_COLUMNS - 1));
            IChartDataSource<double> ys2 = DataSources.FromNumericCellRange(sheet, new CellRangeAddress(2, 2, 0, NUM_OF_COLUMNS - 1));

            //添加標題
            var s1 = data.AddSeries(xs, ys1);
            s1.SetTitle(serie1);
            var s2 = data.AddSeries(xs, ys2);
            s2.SetTitle(serie2);

            chart.Plot(data, bottomAxis, leftAxis);
        }
    }