SeriesBase.SummaryFunction Property

OBSOLETE

This property is obsolete now. Use the NumericSummaryOptions.SummaryFunction, DateTimeSummaryOptions.SummaryFunction or QualitativeSummaryOptions.SummaryFunction property instead.

Specifies the summary function which should calculate data point values.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v20.2.dll

NuGet Packages: DevExpress.Charts, DevExpress.WindowsDesktop.Charts

Declaration

C#

[Obsolete("This property is obsolete now. Use the NumericSummaryOptions.SummaryFunction, DateTimeSummaryOptions.SummaryFunction or QualitativeSummaryOptions.SummaryFunction  property instead.")]
[Browsable(false)]
public string SummaryFunction { get; set; }

VB.NET

<Obsolete("This property is obsolete now. Use the NumericSummaryOptions.SummaryFunction, DateTimeSummaryOptions.SummaryFunction or QualitativeSummaryOptions.SummaryFunction  property instead.")>
<Browsable(False)>
Public Property SummaryFunction As String

Property Value

Type	Description
String	A String specifying the name of a summary function.

Remarks

If you use the SeriesBase.SummaryFunction property (obsolete now), you can replace it with the SummaryOptionsBase.SummaryFunction property. To access SummaryFunction, use following properties:

• SeriesBase.DateTimeSummaryOptions
• SeriesBase.NumericSummaryOptions
• SeriesBase.QualitativeSummaryOptions
• SeriesBase.TimeSpanSummaryOptions

For data-bound series, you can enable the automatic summary calculation. A summary function (either standard or custom) should be registered by calling the ChartControl.RegisterSummaryFunction (WebChartControl.RegisterSummaryFunction) method with the specified parameters (name, displayName, resultScaleType, resultDimensions, argumentDescriptions, function).

For more information, refer to Calculating Summaries.

Example

The following example demonstrates how to create a custom summary function, which returns an OHLC point calculated by the passed array of values. To accomplish this task, create a SummaryFunction delegate and register it using the ChartControl.RegisterSummaryFunction method:

C#

// Declare the Financial summary function. 
private static SeriesPoint[] CalculateProductValue( 
        Series series, 
        object argument, 
        string[] functionArguments, 
        DataSourceValues[] values, 
        object[] colors
) { 
    string functionArgument = functionArguments[0]; 
    int lastIndex = values.Length - 1; 

    double open = Convert.ToDouble(values[0][functionArgument], CultureInfo.InvariantCulture); 
    double close = Convert.ToDouble(values[lastIndex][functionArgument], CultureInfo.InvariantCulture); 
    double high = Math.Max(open, close); 
    double low = Math.Min(open, close); 
    for (int i = 1; i < lastIndex; i++) { 
        high = Math.Max(high, Convert.ToDouble(values[i][functionArgument], CultureInfo.InvariantCulture)); 
        low = Math.Min(low, Convert.ToDouble(values[i][functionArgument], CultureInfo.InvariantCulture)); 
    } 
    // Return the result. 
    return new SeriesPoint[] { 
        new SeriesPoint(argument, high, low, open, close) 
    }; 
} 

private void Form1_Load(object sender, EventArgs e) { 
    chartControl.DataSource = new CurrencyRateLoader("../../Data/EurUsdRate.xml").Load();
    // Register the summary function in a chart. 
    chartControl.RegisterSummaryFunction( 
            name: "FINANCIAL", 
            displayName: "Financial", 
            resultScaleType: ScaleType.Numerical, 
            resultDimension: 4, 
            argumentDescriptions: new SummaryFunctionArgumentDescription[] { 
                new SummaryFunctionArgumentDescription("Value", ScaleType.Numerical) 
            }, 
            function: CalculateProductValue
    );

    Series series = chartControl.Series["EurUsd"]; 
    series.ArgumentDataMember = "DateTime";
    // Note that ValueDataMembers are not specified.
    series.DateTimeSummaryOptions.SummaryFunction = "FINANCIAL([Value])"; 
}

VB.NET

' Declare the Financial summary function.
Private Shared Function CalculateProductValue(
        ByVal series As Series, 
        ByVal argument As Object, 
        ByVal functionArguments() As String, 
        ByVal values() As DataSourceValues, 
        ByVal colors() As Object
) As SeriesPoint()
    Dim functionArgument As String = functionArguments(0)
    Dim lastIndex As Integer = values.Length - 1

    Dim openValue As Double = Convert.ToDouble(values(0)(functionArgument), CultureInfo.InvariantCulture)
    Dim closeValue As Double = Convert.ToDouble(values(lastIndex)(functionArgument), CultureInfo.InvariantCulture)
    Dim highValue As Double = Math.Max(openValue, closeValue)
    Dim lowValue As Double = Math.Min(openValue, closeValue)
    For i As Integer = 1 To lastIndex - 1
        highValue = Math.Max(highValue, Convert.ToDouble(values(i)(functionArgument), CultureInfo.InvariantCulture))
        lowValue = Math.Min(lowValue, Convert.ToDouble(values(i)(functionArgument), CultureInfo.InvariantCulture))
    Next i
    ' Return the result.
    Return New SeriesPoint() { 
        New SeriesPoint(argument, high, low, open, close_Renamed) 
    }
End Function

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    chartControl.DataSource = (New CurrencyRateLoader("../../Data/EurUsdRate.xml")).Load()
    ' Register the summary function in a chart.
    chartControl.RegisterSummaryFunction(
            name:= "FINANCIAL", 
            displayName:= "Financial", 
            resultScaleType:= ScaleType.Numerical, 
            resultDimension:= 4, 
            argumentDescriptions:= New SummaryFunctionArgumentDescription() { 
                New SummaryFunctionArgumentDescription("Value", ScaleType.Numerical) 
            }, 
            [function]:= AddressOf CalculateProductValue
    )

    Dim series As Series = chartControl.Series("EurUsd")
    series.ArgumentDataMember = "DateTime"
    ' Note that ValueDataMembers are not specified.
    series.DateTimeSummaryOptions.SummaryFunction = "FINANCIAL([Value])"
End Sub

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the SummaryFunction property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

winforms-charts-apply-the-best-fit-function-to-a-series/CS/LineOfBestFit/Form1.cs#L108

chartControl1.Series[1].ValueDataMembers.AddRange(new string[] { "MyData" });
this.chartControl1.Series[1].SummaryFunction = "BESTFIT()";
this.textBox1.Text = r.ToString();

how-to-register-and-use-a-custom-summary-function-t257661/CS/RegisterSummaryFunctionExample/MainForm.aspx.cs#L52

    Series series = chartControl.Series["Product"];
    series.SummaryFunction = BuildSummaryFunction("UnitPrice", "UnitsOnOrder");
}

how-to-register-and-use-a-custom-summary-function-t257050/CS/RegisterSummaryFunctionExample/Form1.cs#L55

    Series series = chartControl.Series["EurUsd"];
    series.SummaryFunction = "FINANCIAL([Value])";
}

VB.NET

winforms-charts-apply-the-best-fit-function-to-a-series/VB/LineOfBestFit/Form1.vb#L94

chartControl1.Series(1).ValueDataMembers.AddRange(New String() {"MyData"})
chartControl1.Series(1).SummaryFunction = "BESTFIT()"
textBox1.Text = r.ToString()

how-to-register-and-use-a-custom-summary-function-t257661/VB/RegisterSummaryFunctionExample/MainForm.aspx.vb#L41

    Dim series As Series = chartControl.Series("Product")
    series.SummaryFunction = BuildSummaryFunction("UnitPrice", "UnitsOnOrder")
End Sub

how-to-register-and-use-a-custom-summary-function-t257050/VB/RegisterSummaryFunctionExample/Form1.vb#L42

    Dim series As Series = chartControl.Series("EurUsd")
    series.SummaryFunction = "FINANCIAL([Value])"
End Sub