XPBaseCollection.CollectionChanged Event

Occurs when an item is added to, or removed from the XPBaseCollection (when the XPBaseCollection.BaseAdd or XPBaseCollection.BaseRemove method is called).

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v24.2.dll

Declaration

C#

public event XPCollectionChangedEventHandler CollectionChanged

VB.NET

Public Event CollectionChanged As XPCollectionChangedEventHandler

Event Data

The CollectionChanged event's data class is XPCollectionChangedEventArgs.

Remarks

To subscribe to this event, override the XPBaseObject.CreateCollection<T> or PersistentBase.CreateCollection method of your persistent class.

C#

// Example for generic collection:
protected override XPCollection<T> CreateCollection<T>(XPMemberInfo property) {
    XPCollection<T> collection = base.CreateCollection<T>(property);
    if (property.Name == "MyGenericCollectionProperty") {
        collection.CollectionChanged += collection_CollectionChanged;
    }
    return collection;
}
// Example for non-generic collection:
protected override XPCollection CreateCollection(XPMemberInfo property) {
    XPCollection collection = base.CreateCollection(property);
    if (property.Name == "MyCollectionProperty") {
        collection.CollectionChanged += collection_CollectionChanged;
    }
    return collection;
}

VB.NET

' Example for generic collection:
Protected Overrides Function CreateCollection(Of T)(ByVal [property] As XPMemberInfo) As XPCollection(Of T)
    Dim collection As XPCollection(Of T) = MyBase.CreateCollection(Of T)([property])
    If [property].Name = "MyGenericCollectionProperty" Then
        AddHandler collection.CollectionChanged, AddressOf collection_CollectionChanged
    End If
    Return collection
End Function
' Example for non-generic collection:
Protected Overrides Function CreateCollection(ByVal [property] As XPMemberInfo) As XPCollection
    Dim collection As XPCollection = MyBase.CreateCollection([property])
    If [property].Name = "MyCollectionProperty" Then
        AddHandler collection.CollectionChanged, AddressOf collection_CollectionChanged
    End If
    Return collection
End Function