BaseObject.EvaluateAlias<T>(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.v24.2.dll

NuGet Package: DevExpress.Persistent.BaseImpl.EFCore

Declaration

C#

protected T EvaluateAlias<T>(
    string propertyName = null
)

VB.NET

Protected Function EvaluateAlias(Of T)(
    propertyName As String = Nothing
) As T

Optional Parameters

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

Type Parameters

Name	Description
T	The calculated property value type.

Returns

Type	Description
T	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 {
        // Ensure that the type parameter `T` is set to the type 
        // that matches the calculated expression result type.
        get { return EvaluateAlias<decimal>(); }
    }
}