XPMemberInfo.IsManyToMany Property

Gets whether a member is involved in a many-to-many association.

Namespace: DevExpress.Xpo.Metadata

Assembly: DevExpress.Xpo.v24.2.dll

Declaration

C#

public bool IsManyToMany { get; }

VB.NET

Public ReadOnly Property IsManyToMany As Boolean

Property Value

Type	Description
Boolean	true if the member is involved in a many-to-many association; otherwise, false.

Example

In the following sample code, the Location class might contain several Departments and each Department can in turn span several Locations.

C#

using DevExpress.Xpo;
// ...
public class Location : XPObject {
    public string Name {
        get { return fName; }
        set { SetPropertyValue(nameof(Name), ref fName, value); }
    }
    string fName;

    [Association("Locations-Departments")]
    public XPCollection<Department> Departments { 
        get { return GetCollection<Department>(nameof(Departments)); }
    }
}
public class Department : XPObject {
    public string Name {
        get { return fName; }
        set { SetPropertyValue(nameof(Name), ref fName, value); }
    }
    string fName;

    [Association("Locations-Departments")]
    public XPCollection<Location> Locations { 
        get { return GetCollection<Location>(nameof(Locations)); } 
    }
}

VB.NET

Imports DevExpress.Xpo
' ...
Public Class Location
    Inherits XPObject
    Public Property Name() As String
        Get
            Return fName
        End Get
        Set(ByVal value as String)
            SetPropertyValue(NameOf(Name), fName, value)
        End Set
    End Property
    Private fName As String

    <Association("Locations-Departments")> _
    Public ReadOnly Property Departments() As XPCollection(Of Department)
        Get
            Return GetCollection(Of Department)(NameOf(Departments))
        End Get
    End Property
End Class
Public Class Department
    Inherits XPObject
    Public Property Name() As String
        Get
            Return fName
        End Get
        Set(ByVal value as String)
            SetPropertyValue(NameOf(Name), fName, value)
        End Set
    End Property
    Private fName As String

    <Association("Locations-Departments")> _
    Public ReadOnly Property Locations() As XPCollection(Of Location)
        Get
            Return GetCollection(Of Location)(NameOf(Locations))
        End Get
    End Property
End Class

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the IsManyToMany property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XPO_how-to-clone-a-persistent-object-e804/CS/SimpleObject/CloneHelper.cs#L63

private void CloneCollection(XPMemberInfo memberInfo, object source, object target, bool synchronize) {
    if (memberInfo.IsAssociation && (memberInfo.IsManyToMany || memberInfo.IsAggregated)) {
        XPBaseCollection colTarget = (XPBaseCollection)memberInfo.GetValue(target);

VB.NET

XPO_how-to-clone-a-persistent-object-e804/VB/SimpleObject/CloneHelper.vb#L66

Private Sub CloneCollection(ByVal memberInfo As XPMemberInfo, ByVal source As Object, ByVal target As Object, ByVal synchronize As Boolean)
    If memberInfo.IsAssociation AndAlso (memberInfo.IsManyToMany OrElse memberInfo.IsAggregated) Then
        Dim colTarget As XPBaseCollection = CType(memberInfo.GetValue(target), XPBaseCollection)