• 샘플 다운로드하기

public class BTCChartController : ControllerBase
{
    //    private static readonly string[] Summaries = new[]
    //    {
    //    "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    //};

// Get the CSV data from the AlphaVantage web service
private string GetCsvData()
{
    string csv;
    string API_KEY = "YOUR_KEY_HERE";
    string QUERY_URL = $"https://www.alphavantage.co/query?function=DIGITAL_CURRENCY_MONTHLY&symbol=BTC&market=USD&apikey={API_KEY}&datatype=csv";
    Uri queryUri = new Uri(QUERY_URL);
    using (HttpClient client = new HttpClient())
    {
        Task<string> t = client.GetStringAsync(queryUri);
        while (!t.IsCompleted)
            t.Wait();
        csv = t.Result;
    }
    return csv;
}

// get the worksheet with the CSV data
IWorksheet wks = wbk.Worksheets[0];

// move volume to column B, before open/high/low/close
// it works better to create the StockVOHLC chart with
// the series in the correct order (date-volume-open-high-low-close)
wks.Range["B:B"].Insert();
wks.Range["K:K"].Copy(wks.Range["B:B"]);
wks.Range["K:K"].Delete();

// get the range containing the CSV data
IRange used = wks.UsedRange;

// create a new Table for the CSV data named "BTC_Monthly"
ITable tbl = wks.Tables.Add(used, true);
tbl.Name = "BTC_Monthly";
// auto-fit the columns in the table to show all the cell values
used.AutoFit();

// add the StockVOHLC chart shape over the table (the table is completely beneath the chart)
IShape shape = wks.Shapes.AddChart(ChartType.StockVOHLC, 0, 0, used.Width, used.Height);
// get the IChart from the shape
IChart chart = shape.Chart;
// set the chart title
chart.ChartTitle.Text = "BitCoin Monthly Open-High-Low-Close-Volume";
// add the chart series (the first 6 columns in the table)
chart.SeriesCollection.Add(wks.Range[0, 0, used.RowCount, 6], RowCol.Columns, true, true);
// change category axis base to months
IAxis categoryAxis = chart.Axes.Item(AxisType.Category);
categoryAxis.BaseUnit = TimeUnit.Months;
// change category axis tick label orientation and number format
categoryAxis.TickLabels.Orientation = 45;
categoryAxis.TickLabels.NumberFormat = "d/m/yyyy";

// add trend line for Volume series in Blue
ITrendline voltrend = chart.SeriesCollection[0].Trendlines.Add();
voltrend.Name = "3 Month Moving Avg VOL";
voltrend.Type = TrendlineType.MovingAvg;
voltrend.Period = 3;
voltrend.Format.Line.Color.RGB = Color.Blue;
voltrend.Format.Line.DashStyle = LineDashStyle.RoundDot;
// add trend line for High series in Green
ITrendline hightrend = chart.SeriesCollection[2].Trendlines.Add();
hightrend.Name = "3 Month Moving Avg HIGH";
hightrend.Type = TrendlineType.MovingAvg;
hightrend.Period = 3;
hightrend.Format.Line.Color.RGB = Color.Green;
hightrend.Format.Line.DashStyle = LineDashStyle.RoundDot;
// add trend line for Low series in Red
ITrendline lowtrend = chart.SeriesCollection[3].Trendlines.Add();
lowtrend.Name = "3 Month Moving Avg LOW";
lowtrend.Type = TrendlineType.MovingAvg;
lowtrend.Period = 3;
lowtrend.Format.Line.Color.RGB = Color.Red;
lowtrend.Format.Line.DashStyle = LineDashStyle.RoundDot;

// Save Workbook to XLSX and return from web service as "BTC_Chart.xlsx"
  using (MemoryStream ms = new MemoryStream())
    {
        wbk.Save(ms, SaveFileFormat.Xlsx);
        ms.Seek(0, SeekOrigin.Begin);
        byte[] bytes = ms.ToArray();
        return File(bytes, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "BTC_Chart.xlsx");
    }
} // Get()