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   [Expand]AfterInsertSnListColumnsEventArgs Class
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   [Collapse]CalculatedField Class
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      DataMember Property
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 End-User Documentation

CalculatedField.Expression Property

Specifies the expression of the current calculated field.

Namespace:DevExpress.Snap.Core.API
Assembly:DevExpress.Snap.v17.1.Core.dll

Expanded Syntax

Property value

Type: String
A System.String value.

Expanded Remarks

Use the Expression property to specify the expression for the calculated field. In the Snap project, this property provides access to the Expression Editor.

For expressions, numerous date-time, logical, math and string functions, operators and constants are supported. For a complete list of these functions, refer to Expressions.

To refer to a data field (returned by the DataSource and DataMember properties) within an expression, enclose its name in [square brackets]. Parameters are inserted using the "Parameters." prefix before their names.

Date-time constants must be wrapped in #hashes# ([OrderDate] >= #1/1/2009#). To represent a null reference (one that does not refer to any object), use a question mark ([Region] != ?). And, to denote strings, use 'apostrophes', otherwise, an error occurs.

The type of value returned by a calculated field is defined by its FieldType property.

A calculated field's expression cannot evaluate the values of other calculated fields.

Expanded See Also

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