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c# – labeling a legend in epplus

Posted by: admin April 23, 2020 Leave a comment

Questions:

I’m trying to create a graph from some data I export to an .xls file. I create the graph just fine, but I’m going to have anywhere from 3 – 7 lines on the graph. I added the legend to make it easier to read, but the legend has no text on it. It just shows a line without a label. Is there anyway to label the legend key?

Here’s the code of the graph I’m making:

    var lineChart = ws.Drawings.AddChart(item.TestHeader, eChartType.Line) as ExcelLineChart;
    lineChart.SetSize(800, 400);

    lineChart.Series.Add(Char.ConvertFromUtf32(65 + distanceCount + 1).ToString() + "1:" + Char.ConvertFromUtf32(65 + distanceCount + 1).ToString() + (testCount.ToString()), "A1:A" + (testCount.ToString()));

    lineChart.Title.Text = item.TestHeader;
    lineChart.DataLabel.ShowSeriesName = true;
    lineChart.DataLabel.ShowLegendKey = true;
    lineChart.DataLabel.ShowLeaderLines = true;
    lineChart.XAxis.Title.Text = "Inches from Decoder";
    lineChart.YAxis.Title.Text = "Milliseconds to decode";
    lineChart.YAxis.MaxValue = 1000;     

Any help is better than none, thanks!

How to&Answers:

Your example generated a series name in the legend for me named “Series”. But you can set it explicitly using

lineChart.Series[0].Header = "Series 1 Name";