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ChartCalculatedField.FieldType Property

Gets or sets the type of calculated field values.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v24.1.dll

NuGet Package: DevExpress.Wpf.Charts

Declaration

public ChartCalculatedFieldType FieldType { get; set; }

Property Value

Type
ChartCalculatedFieldType

Available values:

Show 12 items
Name Description
None

Indicates that the field’s type is undefined and determined based on the returned object during chart initialization.

String

Indicates that the field returns a string value as a sequence of UTF-16 code units (the String type).

DateTime

Indicates that the field returns a value expressed as a date and time of day (the DateTime type).

TimeSpan

Indicates that the field returns a value as a time interval (the TimeSpan type).

Byte

Indicates that the field returns an 8-bit unsigned integer value (the Byte type).

Int16

Indicates that the field returns a 16-bit signed integer value (the Int16 type).

Int32

Indicates that the field returns a 32-bit signed integer value (the Int32 type).

Float

Indicates that the field returns a single-precision floating-point value (the Single type).

Double

Indicates that the field returns a double-precision floating-point value (the Double type).

Decimal

Indicates that the field returns a decimal value (the Decimal type).

Boolean

Indicates that the field returns a Boolean (true or false) value (the Boolean type).

Guid

Indicates that the field returns a global unique identifier value (the Guid type).

Remarks

The FieldType property specifies the type of values (Boolean, DateTime, String, etc.) a calculated field returns after its expression is evaluated. The ChartCalculatedFieldType enumeration lists the available types.

Example

The following example shows how to create a calculated field and then use this field as a data source for a series. The field’s values are calculated by the following expression: [Time.Seconds] * [Velocity].

<dxc:ChartControl x:Name="chartControl">
    <dxc:ChartControl.DataContext>
        <local:ChartViewModel/>
    </dxc:ChartControl.DataContext>
    <dxc:ChartControl.CalculatedFields>
        <dxc:ChartCalculatedField FieldName="Displacement" 
                                  Expression="[Time.Seconds] * [Velocity]" 
                                  FieldType="Double"/>
    </dxc:ChartControl.CalculatedFields>
    <dxc:XYDiagram2D>
        <dxc:SplineSeries2D DisplayName="Series" 
                            DataSource="{Binding DataPoints}"
                            ArgumentDataMember="Time"
                            ValueDataMember="Displacement" 
                            CrosshairLabelPattern="{}{Displacement:f1}" 
                            MarkerVisible="True"/>
        ...
    </dxc:XYDiagram2D>
</dxc:ChartControl>
See Also