Format

ChartDataLabel.Format property

Provides access to fill and line formatting of the data label.

public ChartFormat Format { get; }

Examples

Shows how to apply labels to data points in a line chart.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

Shape chartShape = builder.InsertChart(ChartType.Line, 400, 300);
Chart chart = chartShape.Chart;

Assert.That(chart.Series.Count, Is.EqualTo(3));
Assert.That(chart.Series[0].Name, Is.EqualTo("Series 1"));
Assert.That(chart.Series[1].Name, Is.EqualTo("Series 2"));
Assert.That(chart.Series[2].Name, Is.EqualTo("Series 3"));

// Apply data labels to every series in the chart.
// These labels will appear next to each data point in the graph and display its value.
foreach (ChartSeries series in chart.Series)
{
    ApplyDataLabels(series, 4, "000.0", ", ");
    Assert.That(series.DataLabels.Count, Is.EqualTo(4));
}

// Change the separator string for every data label in a series.
using (IEnumerator<ChartDataLabel> enumerator = chart.Series[0].DataLabels.GetEnumerator())
{
    while (enumerator.MoveNext())
    {
        Assert.That(enumerator.Current.Separator, Is.EqualTo(", "));
        enumerator.Current.Separator = " & ";
    }
}

ChartDataLabel dataLabel = chart.Series[1].DataLabels[2];
dataLabel.Format.Fill.Color = Color.Red;

// For a cleaner looking graph, we can remove data labels individually.
dataLabel.ClearFormat();

// We can also strip an entire series of its data labels at once.
chart.Series[2].DataLabels.ClearFormat();

doc.Save(ArtifactsDir + "Charts.DataLabels.docx");

Shows how to apply labels to data points in a line chart (ApplyDataLabels).

/// <summary>
/// Apply data labels with custom number format and separator to several data points in a series.
/// </summary>
private static void ApplyDataLabels(ChartSeries series, int labelsCount, string numberFormat, string separator)
{
    series.HasDataLabels = true;
    series.Explosion = 40;

    for (int i = 0; i < labelsCount; i++)
    {
        Assert.That(series.DataLabels[i].IsVisible, Is.False);

        series.DataLabels[i].ShowCategoryName = true;
        series.DataLabels[i].ShowSeriesName = true;
        series.DataLabels[i].ShowValue = true;
        series.DataLabels[i].ShowLeaderLines = true;
        series.DataLabels[i].ShowLegendKey = true;
        series.DataLabels[i].ShowPercentage = false;
        Assert.That(series.DataLabels[i].IsHidden, Is.False);
        Assert.That(series.DataLabels[i].ShowDataLabelsRange, Is.False);

        series.DataLabels[i].NumberFormat.FormatCode = numberFormat;
        series.DataLabels[i].Separator = separator;

        Assert.That(series.DataLabels[i].ShowDataLabelsRange, Is.False);
        Assert.That(series.DataLabels[i].IsVisible, Is.True);
        Assert.That(series.DataLabels[i].IsHidden, Is.False);
    }
}

See Also

ChartDataLabel.Font ChartDataLabel.Index