How to: Delay Property Loading

• Nov 21, 2018

This example demonstrates how to delay the loading of the Photo property. This property will be loaded the first time it is accessed.

C#

using DevExpress.Xpo;

public class Person : XPObject {
    public Person(Session session) : base(session) { }

    [ValueConverter(typeof(DevExpress.Xpo.Metadata.ImageValueConverter)), Delayed]
    public System.Drawing.Image Photo {
        get { return GetDelayedPropertyValue<System.Drawing.Image>("Photo"); }
        set { SetDelayedPropertyValue<System.Drawing.Image>("Photo", value); }
    }
}

VB.NET

Imports DevExpress.Xpo

Public Class Person
    Inherits XPObject
    Public Sub New(ByVal session As Session)
        MyBase.New(session)
    End Sub

    <ValueConverter(GetType(DevExpress.Xpo.Metadata.ImageValueConverter)), Delayed> _
    Public Property Photo() As System.Drawing.Image
        Get
            Return GetDelayedPropertyValue(Of System.Drawing.Image)("Photo")
        End Get
        Set
            SetDelayedPropertyValue(Of System.Drawing.Image)("Photo", Value)
        End Set
    End Property
End Class