MeasureCalculation Class

Serves as the base class for classes that are measure calculations allowing you to apply specific computations to Measure values that are related to the currently processed value.

Namespace: DevExpress.DashboardCommon

Assembly: DevExpress.Dashboard.v19.1.Core.dll

Declaration

C#
VB.NET

public abstract class MeasureCalculation :
    ClonableModelBase<MeasureCalculation>,
    IWindowCalculation

Public MustInherit Class MeasureCalculation
    Inherits ClonableModelBase(Of MeasureCalculation)
    Implements IWindowCalculation

Remarks

To apply a calculation to values of the required measure, perform the following steps.

Create the MeasureCalculation class instance, initialize its settings and assign the resulting object to the Measure.Calculation property. As an alternative, you can create a Measure.Expression with the calculation functions.
Specify a window to apply a calculation. To do this, create and initialize the descendant of the MeasureCalculationWindowDefinition class (depending on the type of the dashboard item) and assign the resulting object to the WindowDefinition property.

Example

The code snippet adds a new measure to the Pivot dashboard item and specifies a window calculation to compute the difference between measure values across a window. The calculation is performed along columns of the Pivot dashboard item.

C#
VB.NET

using DevExpress.DashboardCommon;
using DevExpress.DashboardWin;
// ...
PivotDashboardItem pivotItem = dashboardViewer1.Dashboard.Items[pivotItemName] as PivotDashboardItem;
if (pivotItem != null)
{
    Measure extendedPrice = new Measure("Extended Price")
    {
        Name = "Diff",
        ShowGrandTotals = false
    };
    PivotWindowDefinition pivotWindowDefinition = new PivotWindowDefinition();
    pivotWindowDefinition.DefinitionMode = PivotWindowDefinitionMode.Columns;
    extendedPrice.WindowDefinition = pivotWindowDefinition;
    extendedPrice.Calculation = new DifferenceCalculation() { DifferenceType = DifferenceType.Absolute };
    pivotItem.Values.Add(extendedPrice);
}

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWin
' ...
Dim pivotItem As PivotDashboardItem = TryCast(dashboardViewer1.Dashboard.Items(pivotItemName), PivotDashboardItem)
If pivotItem IsNot Nothing Then
    Dim extendedPrice As New Measure("Extended Price") With { _
        .Name = "Diff", _
        .ShowGrandTotals = False _
    }
    Dim pivotWindowDefinition As New PivotWindowDefinition()
    pivotWindowDefinition.DefinitionMode = PivotWindowDefinitionMode.Columns
    extendedPrice.WindowDefinition = pivotWindowDefinition
    extendedPrice.Calculation = New DifferenceCalculation() With {.DifferenceType = DifferenceType.Absolute}
    pivotItem.Values.Add(extendedPrice)
End If