wpf-devexpress-dot-xpf-dot-grid-dot-columnbase-72377bfd.md
Gets or sets an expression used to evaluate values for this column if it is not bound to a data source field.
Namespace : DevExpress.Xpf.Grid
Assembly : DevExpress.Xpf.Grid.v25.2.Core.dll
NuGet Package : DevExpress.Wpf.Grid.Core
[DefaultValue("")]
public string UnboundExpression { get; set; }
<DefaultValue("")>
Public Property UnboundExpression As String
| Type | Default | Description |
|---|---|---|
| String | String.Empty |
A String that specifies an expression used to evaluate values for this column.
|
The GridControl supports bound and unbound columns:
Bound columns obtain their data from data fields in a grid’s data source.
Unbound columns are not bound to any field in the data source. These columns must be populated manually by handling the GridControl.CustomUnboundColumnData event or using the UnboundExpression property.
<dxg:GridColumn FieldName="DiscountAmount"
UnboundDataType="{x:Type sys:Decimal}"
UnboundExpression="Round([UnitPrice] * [Quantity] - [Total])">
</dxg:GridColumn>
Tip
Topics :
The following code snippets (auto-collected from DevExpress Examples) contain references to the UnboundExpression 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.
<dxg:GridControl.Columns>
<dxg:GridColumn FieldName="Date" Header="Date" UnboundType="DateTime" UnboundExpression="GetDate([DateTime])" AllowEditing="False"/>
<dxg:GridColumn FieldName="Time" Header="Time" UnboundType="DateTime" UnboundExpression="AddTicks(Today(), GetTimeOfDay([DateTime]))" AllowEditing="False" RoundDateTimeForColumnFilter="False">
wpf-data-grid-export-data-to-native-excel-table/CS/WpfApplication80/MainWindow.xaml#L15
<dxg:GridColumn FieldName="MaxValue"/>
<dxg:GridColumn FieldName="Average" UnboundType="Integer" UnboundExpression="([MinValue]+[MaxValue])/2"/>
<dxg:GridControl.View>
wpf-datagrid-round-decimal-values/CS/FilterDuplicateRecords_Unbound/MainWindow.xaml#L21
UnboundType="Decimal"
UnboundExpression="Round([Growth], 2)"
ReadOnly="True"/>
See Also