PivotGridField.UnboundExpressionMode Property
Gets or sets how the unbound expression for the specified data field is calculated.
Namespace: DevExpress.Xpf.PivotGrid
Assembly: DevExpress.Xpf.PivotGrid.v24.2.dll
NuGet Package: DevExpress.Wpf.PivotGrid
Declaration
Property Value
| Type | Description |
|---|---|
| FieldUnboundExpressionMode | An FieldUnboundExpressionMode object that specifies how the unbound expression for the specified data field is calculated. |
Available values:
| Name | Description |
|---|---|
| Default | The default parameter value. |
| UseSummaryValues | An unbound expression is calculated against summary values. |
| DataSource | An unbound expression is calculated against each data source record, and the resulting values are summarized. |
| UseAggregateFunctions | An unbound expression is calculated using aggregates. |
Remarks
Unbound expressions can be calculated against summary values, or values stored in the underlying data source.
The image below shows the PivotGrid control with the drill down form invoked. The ‘Price Per Unit’ column is unbound, and the expression is specified as [Extended Price] / [Quantity].
If the ‘Price Per Unit’ field’s UnboundExpressionMode property is set to FieldUnboundExpressionMode.DataSource, the unbound expression is calculated against each data source record, and then the resulting values are summarized. In the pivot grid shown above, the ‘Price Per Unit’ column value in the ‘Gravad lax’ row will be calculated as follows:
Sum([Extended Price] / [Quantity]) = 20.8 / 1 + 582.4 / 28 + 208 / 10 + 421.2 / 18 + 1248 / 60 + 208 / 8 = 132.6
If the field’s UnboundExpressionMode property is set to UnboundExpressionMode.UseSummaryValues, the expression is calculated against summary values, as follows:
Sum([Extended Price]) / Sum([Quantity]) = (20.8 + 582.4 + 208 + 421.2 + 1248 + 208) / (1 + 28 + 10 + 18 + 60 + 8) = 2688.4 / 125 = 21.5
- If the field’s UnboundExpressionMode property is set to FieldUnboundExpressionMode.UseAggregateFunctions, an unbound expression is calculated using aggregates.
Note
You can refer to the field using the PivotGridField.ExpressionFieldName property, which automatically returns the required identifier based on the currently enabled mode.
Note
Unbound expressions evaluated against hidden fields and fields located in the Filter Area return the ‘Error’ value if the UnboundExpressionMode property is set to UnboundExpressionMode.UseSummaryValues, because summary values for these fields are not calculated.
To learn more, see Unbound Fields.
To specify the unbound expressions mode for all data fields, use the PivotGridControl.DataFieldUnboundExpressionMode property.