Ich habe zwei Domänenklassen: Parent und Child. Wenn ich einen Domänendienst verwende, um eine Liste von übergeordneten Objekten abzurufen, möchte ich die Kinder jedes übergeordneten Objekts abrufen.Hier sind die Domänenklassen, der Domänendienst und der Clientcode:
public class Parent
{
private IList<Child> children;
[Key]
public virtual int ParentId { get; set; }
public Parent()
{
children = new List<Child>();
}
public virtual string Name { get; set; }
[Include()]
[Association("ParentChild", "ParentId", "ChildId", IsForeignKey = false)]
public virtual IList<Child> Children
{
get { return children; ; }
set { children = value; }
}
public virtual void AddChild(Child child)
{
child.Parent = this;
Children.Add(child);
}
}
public class Child
{
[Key]
public virtual int ChildId { get; set; }
public virtual String Name { get; set; }
public virtual String Action { get; set; }
[Include]
[Association("ParentChild", "ChildId", "ParentId", IsForeignKey = true)]
public virtual Parent Parent { get; set; }
}Domain-Dienst:
[EnableClientAccess()]
public class ParentDomainService : DomainService
{
public IList<Parent> GetParents()
{
var system = new Parent() { ParentId = 1, Name = "System1" };
system.AddChild(new Child()
{
Action = "Action1",
ChildId = 3,
Name = "File1"
});
system.AddChild(new Child()
{
Action = "Action2",
ChildId = 5,
Name = "File2"
});
var result = new List<Parent>() {system};
return result;
}
}silverlight gui code: nur eine Schaltfläche mit einem Event-Handler:
private void button1_Click(object sender, RoutedEventArgs e)
{
var context = new ParentDomainContext();
var entityQuery = context.GetParentsQuery();
context.Load(entityQuery,OnParentsLoaded,null);
}
private void OnParentsLoaded(LoadOperation<Parent> obj)
{
var fileSystem = obj.Entities.FirstOrDefault();
if (fileSystem != null)
{
var memoryFiles = fileSystem.Children.ToList();
}
}die Kinder sind verschwunden!
Bitte, wenn jemand helfen kann, ich kann nicht sehen, was fehlt.
Der generierte Code auf dem Client:
/// <summary>
/// The 'Child' entity class.
/// </summary>
[DataContract(Namespace="http://schemas.datacontract.org/2004/07/WordsBuilder.DomainModel")]
public sealed partial class Child : Entity
{
private string _action;
private int _childId;
private string _name;
private EntityRef<Parent> _parent;
#region Extensibility Method Definitions
/// <summary>
/// This method is invoked from the constructor once initialization is complete and
/// can be used for further object setup.
/// </summary>
partial void OnCreated();
partial void OnActionChanging(string value);
partial void OnActionChanged();
partial void OnChildIdChanging(int value);
partial void OnChildIdChanged();
partial void OnNameChanging(string value);
partial void OnNameChanged();
#endregion
/// <summary>
/// Initializes a new instance of the <see cref="Child"/> class.
/// </summary>
public Child()
{
this.OnCreated();
}
/// <summary>
/// Gets or sets the 'Action' value.
/// </summary>
[DataMember()]
public string Action
{
get
{
return this._action;
}
set
{
if ((this._action != value))
{
this.OnActionChanging(value);
this.RaiseDataMemberChanging("Action");
this.ValidateProperty("Action", value);
this._action = value;
this.RaiseDataMemberChanged("Action");
this.OnActionChanged();
}
}
}
/// <summary>
/// Gets or sets the 'ChildId' value.
/// </summary>
[DataMember()]
[Key()]
[RoundtripOriginal()]
public int ChildId
{
get
{
return this._childId;
}
set
{
if ((this._childId != value))
{
this.OnChildIdChanging(value);
this.RaiseDataMemberChanging("ChildId");
this.ValidateProperty("ChildId", value);
this._childId = value;
this.RaiseDataMemberChanged("ChildId");
this.OnChildIdChanged();
}
}
}
/// <summary>
/// Gets or sets the 'Name' value.
/// </summary>
[DataMember()]
public string Name
{
get
{
return this._name;
}
set
{
if ((this._name != value))
{
this.OnNameChanging(value);
this.RaiseDataMemberChanging("Name");
this.ValidateProperty("Name", value);
this._name = value;
this.RaiseDataMemberChanged("Name");
this.OnNameChanged();
}
}
}
/// <summary>
/// Gets or sets the associated <see cref="Parent"/> entity.
/// </summary>
[Association("ParentChild", "ChildId", "ParentId", IsForeignKey=true)]
public Parent Parent
{
get
{
if ((this._parent == null))
{
this._parent = new EntityRef<Parent>(this, "Parent", this.FilterParent);
}
return this._parent.Entity;
}
set
{
Parent previous = this.Parent;
if ((previous != value))
{
this.ValidateProperty("Parent", value);
if ((previous != null))
{
this._parent.Entity = null;
previous.Children.Remove(this);
}
if ((value != null))
{
this.ChildId = value.ParentId;
}
else
{
this.ChildId = default(int);
}
this._parent.Entity = value;
if ((value != null))
{
value.Children.Add(this);
}
this.RaisePropertyChanged("Parent");
}
}
}
private bool FilterParent(Parent entity)
{
return (entity.ParentId == this.ChildId);
}
/// <summary>
/// Computes a value from the key fields that uniquely identifies this entity instance.
/// </summary>
/// <returns>An object instance that uniquely identifies this entity instance.</returns>
public override object GetIdentity()
{
return this._childId;
}
}
/// <summary>
/// The 'Parent' entity class.
/// </summary>
[DataContract(Namespace="http://schemas.datacontract.org/2004/07/WordsBuilder.DomainModel")]
public sealed partial class Parent : Entity
{
private EntityCollection<Child> _children;
private string _name;
private int _parentId;
#region Extensibility Method Definitions
/// <summary>
/// This method is invoked from the constructor once initialization is complete and
/// can be used for further object setup.
/// </summary>
partial void OnCreated();
partial void OnNameChanging(string value);
partial void OnNameChanged();
partial void OnParentIdChanging(int value);
partial void OnParentIdChanged();
#endregion
/// <summary>
/// Initializes a new instance of the <see cref="Parent"/> class.
/// </summary>
public Parent()
{
this.OnCreated();
}
/// <summary>
/// Gets the collection of associated <see cref="Child"/> entity instances.
/// </summary>
[Association("ParentChild", "ParentId", "ChildId")]
public EntityCollection<Child> Children
{
get
{
if ((this._children == null))
{
this._children = new EntityCollection<Child>(this, "Children", this.FilterChildren, this.AttachChildren, this.DetachChildren);
}
return this._children;
}
}
/// <summary>
/// Gets or sets the 'Name' value.
/// </summary>
[DataMember()]
public string Name
{
get
{
return this._name;
}
set
{
if ((this._name != value))
{
this.OnNameChanging(value);
this.RaiseDataMemberChanging("Name");
this.ValidateProperty("Name", value);
this._name = value;
this.RaiseDataMemberChanged("Name");
this.OnNameChanged();
}
}
}
/// <summary>
/// Gets or sets the 'ParentId' value.
/// </summary>
[DataMember()]
[Editable(false, AllowInitialValue=true)]
[Key()]
[RoundtripOriginal()]
public int ParentId
{
get
{
return this._parentId;
}
set
{
if ((this._parentId != value))
{
this.OnParentIdChanging(value);
this.ValidateProperty("ParentId", value);
this._parentId = value;
this.RaisePropertyChanged("ParentId");
this.OnParentIdChanged();
}
}
}
private void AttachChildren(Child entity)
{
entity.Parent = this;
}
private void DetachChildren(Child entity)
{
entity.Parent = null;
}
private bool FilterChildren(Child entity)
{
return (entity.ChildId == this.ParentId);
}
/// <summary>
/// Computes a value from the key fields that uniquely identifies this entity instance.
/// </summary>
/// <returns>An object instance that uniquely identifies this entity instance.</returns>
public override object GetIdentity()
{
return this._parentId;
}
}
