wpf-devexpress-dot-xpf-dot-charts-af8f1c4f.md
Lists a calculated field’s returned value types.
Namespace : DevExpress.Xpf.Charts
Assembly : DevExpress.Xpf.Charts.v25.2.dll
NuGet Package : DevExpress.Wpf.Charts
public enum ChartCalculatedFieldType
Public Enum ChartCalculatedFieldType
| 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).
|
The following properties accept/return ChartCalculatedFieldType values:
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>
using System;
using System.Collections.Generic;
using System.Windows;
namespace CalculatedFields {
public class ChartViewModel {
List<DataPoint> dataPoints;
public List<DataPoint> DataPoints {
get {
if (dataPoints == null) {
dataPoints = new List<DataPoint> {
new DataPoint (new TimeSpan(0, 0, 0), 10),
new DataPoint (new TimeSpan(0, 0, 1), 11.46),
new DataPoint (new TimeSpan(0, 0, 2), 11.90),
new DataPoint (new TimeSpan(0, 0, 3), 12.1),
new DataPoint (new TimeSpan(0, 0, 4), 12.236),
new DataPoint (new TimeSpan(0, 0, 5), 12.325),
new DataPoint (new TimeSpan(0, 0, 6), 12.625),
new DataPoint (new TimeSpan(0, 0, 7), 13.896),
new DataPoint (new TimeSpan(0, 0, 8), 14.123),
new DataPoint (new TimeSpan(0, 0, 9), 14.623),
new DataPoint (new TimeSpan(0, 0, 10), 15.007),
new DataPoint (new TimeSpan(0, 0, 11), 15.452),
new DataPoint (new TimeSpan(0, 0, 12), 15.756)
};
}
return dataPoints;
}
}
}
public class DataPoint {
public TimeSpan Time { get; set; }
public double Velocity { get; set; }
public DataPoint(TimeSpan time, double velocity) {
this.Time = time;
this.Velocity = velocity;
}
}
}
Imports System
Imports System.Collections.Generic
Imports System.Windows
Namespace CalculatedFields
Public Class ChartViewModel
Private f_DataPoints As List(Of DataPoint)
Public ReadOnly Property DataPoints As List(Of DataPoint)
Get
If f_DataPoints Is Nothing Then
f_DataPoints = New List(Of DataPoint) From {
New DataPoint(New TimeSpan(0, 0, 0), 10),
New DataPoint(New TimeSpan(0, 0, 1), 11.46),
New DataPoint(New TimeSpan(0, 0, 2), 11.90),
New DataPoint(New TimeSpan(0, 0, 3), 12.1),
New DataPoint(New TimeSpan(0, 0, 4), 12.236),
New DataPoint(New TimeSpan(0, 0, 5), 12.325),
New DataPoint(New TimeSpan(0, 0, 6), 12.625),
New DataPoint(New TimeSpan(0, 0, 7), 13.896),
New DataPoint(New TimeSpan(0, 0, 8), 14.123),
New DataPoint(New TimeSpan(0, 0, 9), 14.623),
New DataPoint(New TimeSpan(0, 0, 10), 15.007),
New DataPoint(New TimeSpan(0, 0, 11), 15.452),
New DataPoint(New TimeSpan(0, 0, 12), 15.756)
}
End If
Return f_DataPoints
End Get
End Property
End Class
Public Class DataPoint
Public Property Time As TimeSpan
Public Property Velocity As Double
Public Sub New(ByVal time As TimeSpan, ByVal velocity As Double)
Me.Time = time
Me.Velocity = velocity
End Sub
End Class
End Namespace
See Also