XPO (eXpress Persistent Objects)

• Jul 14, 2021
• 3 minutes to read

Note

You are viewing documentation for the legacy WPF Scheduler control. If you’re starting a new project, we strongly recommend that you use a new control declared in the DevExpress.Xpf.Scheduling namespace. If you decide to upgrade an existing project in order to switch to the updated scheduler control, see the Migration Guidelines document.

A Scheduler Storage can be bound to an XPCollection object provided by the eXpress Persistent Objects suite. For example, the following code demonstrates how to implement custom appointment and resource classes, which are the XPObject class descendants.

C#

using DevExpress.Xpo;
using DevExpress.Xpo.Metadata;
// ...

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

    public int AppointmentType;
    public DateTime StartDate;
    public DateTime EndDate;
    public bool AllDay;
    public string Subject;
    public string Location;
    [Size(SizeAttribute.Unlimited)]
    public string Description;
    public int Status;
    public long Label;
    [Size(SizeAttribute.Unlimited)]
    public string RecurrenceInfo;
    [Size(SizeAttribute.Unlimited)]
    public string ReminderInfo;
    [Size(SizeAttribute.Unlimited)]
    public string CustomField1;

    public CustomResource Resource;
}

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

    [Size(SizeAttribute.Unlimited)]
    public string ResourceName;
    [ValueConverter(typeof(ColorValueConverter))]
    public Color Color;
    public Image Image;
    [Size(SizeAttribute.Unlimited)]
    public string CustomField1;
}

public class ColorValueConverter : ValueConverter {
    public override Type StorageType { get { return typeof(Int32); } }
    public override object ConvertToStorageType(object value) {
        if (!(value is Color)) return null;
        return ((Color)value).ToArgb();
    }
    public override object ConvertFromStorageType(object value) {
        if (!(value is Int32)) return null;
        return Color.FromArgb((Int32)value);
    }
}

VB.NET

Imports DevExpress.Xpo
Imports DevExpress.Xpo.Metadata
' ...

Public Class CustomAppointment
    Inherits XPObject

    Public Sub New(session As Session)
        MyBase.New(session)
    End Sub

    Public AppointmentType As Integer
    Public StartDate As DateTime
    Public EndDate As DateTime
    Public AllDay As Boolean
    Public Subject As String
    Public Location As String
    <Size(SizeAttribute.Unlimited)> 
    Public Description As String
    Public Status As Integer
    Public Label As Long
    <Size(SizeAttribute.Unlimited)> 
    Public RecurrenceInfo As String
    <Size(SizeAttribute.Unlimited)> 
    Public ReminderInfo As String
    <Size(SizeAttribute.Unlimited)> 
    Public CustomField1 As String

    Public Resource As CustomResource
End Class

Public Class CustomResource
    Inherits XPObject

    Public Sub New(session As Session)
        MyBase.New(session)
    End Sub

    <Size(SizeAttribute.Unlimited)>  
    Public ResourceName As String
    <ValueConverter(GetType(ColorValueConverter))>
    Public Color As Color
    Public Image As Image
    <Size(SizeAttribute.Unlimited)> 
    Public CustomField1 As String
End Class


Public Class ColorValueConverter
    Inherits ValueConverter

    Public Overrides ReadOnly Property StorageType() As Type
        Get
            Return GetType(Int32)
        End Get
    End Property

    Public Overrides Function ConvertToStorageType(ByVal value As Object) As Object
        If Not TypeOf value Is Color Then
            Return Nothing
        End If
        Return CType(value, Color).ToArgb()
    End Function

    Public Overrides Function ConvertFromStorageType(ByVal value As Object) As Object
        If Not TypeOf value Is Int32 Then
            Return Nothing
        End If
        Return Color.FromArgb(CType(value, Int32))
    End Function
End Class