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 End-User Documentation

GridColumn.UnboundExpression Property

Gets or sets an expression used to evaluate values for the current unbound column.

Namespace:DevExpress.XtraGrid.Columns
Assembly:DevExpress.XtraGrid.v17.2.dll

Expanded Syntax

Property value

Type: String
A string that specifies an expression used to evaluate values for the current column.
The default is String.Empty.

Expanded Remarks

Unbound columns can be populated manually with the ColumnView.CustomUnboundColumnData event, or by specifying an expression via the UnboundExpression, used to evaluate values for this field.

At design time, an expression can be specified with the Expression Editor, which can be invoked by clicking the ellipsis button (...) for the UnboundExpression property in the Visual Studio Properties window.

The Expressions section describes the syntax for creating expressions.

Using expressions doesn't allow data entered by end-users to be saved. To save data, provide data for unbound fields via the ColumnView.CustomUnboundColumnData event.

If the ShowUnboundExpressionMenu option is enabled, an end-user can edit a column's expression via the Expression Editor at runtime. See ShowUnboundExpressionMenu, for more information.

To learn more about unbound columns, see Unbound Columns.

Expanded Online Video

Expanded Example

The following code shows how to create an unbound column (Ext Price) and populate it with data using expressions. Data for this column is calculated according to the formula: [Quantity] * [UnitPrice] * (1 - [Discount]), which is set via the UnboundExpression property.

Expanded See Also

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