EntityRef<TEntity> Class

Artigo
01/27/2012

[WCF RIA Services Version 1 Service Pack 2 is compatible with either .NET framework 4 or .NET Framework 4.5, and with either Silverlight 4 or Silverlight 5.]

Represents a reference to an associated entity.

Inheritance Hierarchy

System.Object
System.ServiceModel.DomainServices.Client.EntityRef<TEntity>

Namespace: System.ServiceModel.DomainServices.Client
Assembly: System.ServiceModel.DomainServices.Client (in System.ServiceModel.DomainServices.Client.dll)

Syntax

'Declaration
Public NotInheritable Class EntityRef(Of TEntity As Entity)

'Usage
Dim instance As EntityRef(Of TEntity)

public sealed class EntityRef<TEntity>
where TEntity : Entity

generic<typename TEntity>
where TEntity : Entity
public ref class EntityRef sealed

[<SealedAttribute>]
type EntityRef<'TEntity when 'TEntity : Entity> =  class end

JScript does not support generic types and methods.

Type Parameters

TEntity
The type of the associated Entity.

The EntityRef<TEntity> type exposes the following members.

Constructors

	Name	Description
	EntityRef<TEntity>	Initializes an instance of the EntityRef<TEntity> class.

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Properties

	Name	Description
	Entity	Gets or sets the associated Entity.

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Methods

	Name	Description
	Equals	(Inherited from Object.)
	Finalize	(Inherited from Object.)
	GetHashCode	(Inherited from Object.)
	GetType	(Inherited from Object.)
	MemberwiseClone	(Inherited from Object.)
	ToString	(Inherited from Object.)

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Examples

<Association("Employee_Employee", "ManagerID", "EmployeeID", IsForeignKey = True)>
<XmlIgnore()>
Public Property Employee2 As Employee
    Get
        If Me._employee2 = Nothing Then
            Me._employee2 = New EntityRef(Of Employee)(Me, "Employee2", Me.FilterEmployee2)
        End If
    End Get
    Set(ByVal value As Employee)
        Dim previous As Employee = Me.Employee2

        If previous = Me.Employee2 Then
            Me.ValidateProperty("Employee2", value)
            ' EntityCollection.Remove()
            If previous <> Value Then
                Me._employee2.Entity = Nothing
                previous.Employee1.Remove(Me)
                Me.Employee1.EntityRemoved += New EventHandler(Of EntityCollectionChangedEventArgs(Of Employee))(Employee1_EntityRemoved)
            End If
            If Value <> Nothing Then
                Me.ManagerID = value.EmployeeID
            End If

            Me._employee2.Entity = value
            ' EntityCollection.Add()
            If value <> Nothing Then
                value.Employee1.Add(Me)
                Me.Employee1.EntityAdded += New EventHandler(Of EntityCollectionChangedEventArgs(Of Employee))(Employee1_EntityAdded)
            End If

            Me.RaisePropertyChanged("Employee2")
        End If
    End Set
End Property

public Employee Employee2
{
    get
    {
        if ((this._employee2 == null))
        {
            // Set this._employee2 equal to a new EntityRef of Type Employee.
            this._employee2 = new EntityRef<Employee>(this, "Employee2", this.FilterEmployee2);
        }
        return this._employee2.Entity;
    }
    set
    {
        Employee previous = this.Employee2;
        if ((previous != value))
        {
            this.ValidateProperty("Employee2", value);
            // EntityCollection.Remove()
            if ((previous != null))
            {
                this._employee2.Entity = null;
                previous.Employee1.Remove(this);
                this.Employee1.EntityRemoved += new EventHandler<EntityCollectionChangedEventArgs<Employee>>(Employee1_EntityRemoved);
            }
            if ((value != null))
            {
                this.ManagerID = value.EmployeeID;
            }
            else
            {
                this.ManagerID = default(Nullable<int>);
            }
            this._employee2.Entity = value;
            // EntityCollection.Add()
            if ((value != null))
            {
                value.Employee1.Add(this);
                this.Employee1.EntityAdded += new EventHandler<EntityCollectionChangedEventArgs<Employee>>(Employee1_EntityAdded);

            }
            this.RaisePropertyChanged("Employee2");
        }
    }
}

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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