BaseObject.EvaluateAlias(String) Method

Calculates the value of a calculated property whose name is specified by the propertyName parameter. The expression used in calculation must be specified through the PersistentAlias or Calculated attribute.

Namespace: DevExpress.Persistent.BaseImpl.EF

Assembly: DevExpress.Persistent.BaseImpl.EFCore.v25.1.dll

NuGet Package: DevExpress.Persistent.BaseImpl.EFCore

Declaration

C#

protected object EvaluateAlias(
    string propertyName = null
)

VB.NET

Protected Function EvaluateAlias(
    propertyName As String = Nothing
) As Object

Optional Parameters

Name	Type	Default	Description
propertyName	String	null	Specifies the name of a property value to be calculated.

Returns

Type	Description
Object	The calculated property value.

Remarks

Use the EvaluateAlias method to calculate the value of a calculated property.

The propertyName parameter specifies the name of a property value to be calculated. If this parameter is not specified and the EvaluateAlias method is called in a property getter, the propertyName parameter is automatically set to this property’s name.

The following code snippet uses the EvaluateAlias method:

C#

using DevExpress.ExpressApp.DC;
using DevExpress.ExpressApp.Model;
using DevExpress.Persistent.Base;
using DevExpress.Persistent.BaseImpl.EF;

[DefaultClassOptions]
public class Payment : BaseObject {
    [ModelDefault("DisplayFormat", "{0:c}")]
    public virtual decimal Rate { get; set; }
    public virtual decimal Hours { get; set; }

    [ModelDefault("DisplayFormat", "{0:c}")]
    [PersistentAlias("Rate * Hours")]
    public decimal Amount {
        get { return (decimal)EvaluateAlias(); }
    }
}