private void RemoveNotifyPropertyChangedHandlers()
{
foreach (var node in EntityRelationGraph.OfType <INotifyPropertyChanged>())
{
node.PropertyChanged -= node_PropertyChanged;
}
}
protected void EntityRelationGraphReset()
{
if (EntityRelationGraphResetting != null)
{
EntityRelationGraphResetting(this, new EventArgs());
}
EntityRelationGraph = null;
if (EntityRelationGraphResetted != null)
{
EntityRelationGraphResetted(this, new EventArgs());
}
}
/// <summary>
/// (Re-)builds the associations between the nodes of the graph.
/// </summary>
/// <param name="nodes"></param>
/// <param name="graph"></param>
private static void BuildEntityGraph(Dictionary <TEntity, TEntity> nodes, EntityRelationGraph <TEntity> graph)
{
foreach (var n in graph.Nodes)
{
var newEntity = nodes[n.Node];
foreach (var association in n.SingleEdges.Keys)
{
var oldAssociationEntity = n.SingleEdges[association];
var newAssociationEntity = nodes[oldAssociationEntity];
association.SetValue(newEntity, newAssociationEntity, null);
}
foreach (var association in n.ListEdges.Keys)
{
IEnumerable assocList = (IEnumerable)association.GetValue(newEntity, null);
Type assocListType = assocList.GetType();
var addMethod = assocListType.GetMethod("Add");
foreach (var oldAssociationEntity in n.ListEdges[association])
{
var newAssociationEntity = nodes[oldAssociationEntity];
addMethod.Invoke(assocList, new object[] { newAssociationEntity });
}
}
#if SILVERLIGHT
// The code below is to fix an error in RIA where relationship span is not performed
// for newly created entities.
// This means that for an association that is not included in the entity graph,
// the 'newEntity' entity would include the foreing key to that entity, but since no relationship span
// takes place, the corresponding association is not bound to that entity.
// Below we set these association properties ourselves. We detect newly created entities by
// the heuristic that they don't have an origional state. We only set the association if the
// corresponding entity is detached from the context, otherwise the 'newEntity' entity would be
// added to the context as a side effect.
foreach (PropertyInfo association in GetAssociations(newEntity))
{
if (association.PropertyType.IsSubclassOf(typeof(TEntity)))
{
TEntity e = (TEntity)association.GetValue(n.Node, null);
if (e != null && e is System.ServiceModel.DomainServices.Client.Entity)
{
if ((e as System.ServiceModel.DomainServices.Client.Entity).GetOriginal() == null)
{
if ((e as System.ServiceModel.DomainServices.Client.Entity).EntityState == System.ServiceModel.DomainServices.Client.EntityState.Detached)
{
association.SetValue(newEntity, nodes.ContainsKey(e) ? nodes[e] : e, null);
}
}
}
}
}
#endif
}
}
/// <summary>
/// Returns the entity graph as defined by associations that are marked with the 'EntityGraphAttribute' attribute.
/// The resulting graph consists of a list of GraphNodes. Each GraphNode has an element 'Node' of type 'T',
/// which represents the actual node, a set, SingleEdges, which correspond to EntityRefs, and a
/// a set, ListEdges, which correspond to EntityCollections.
/// </summary>
/// <param name="entity"></param>
/// <param name="graph"></param>
private void BuildEntityGraph(TEntity entity, EntityRelationGraph <TEntity> graph)
{
if (graph.Nodes.Any(n => n.Node == entity))
{
return;
}
EntityRelation <TEntity> node = new EntityRelation <TEntity>()
{
Node = entity
};
graph.Nodes.Add(node);
foreach (PropertyInfo edge in GraphShape.OutEdges(entity))
{
if (typeof(IEnumerable).IsAssignableFrom(edge.PropertyType))
{
var assocList = GraphShape.GetNodes(entity, edge);
if (assocList == null)
{
continue;
}
node.ListEdges.Add(edge, new List <TEntity>());
foreach (TEntity e in assocList)
{
if (e != null)
{
node.ListEdges[edge].Add(e);
BuildEntityGraph(e, graph);
}
}
}
else
{
TEntity e = (TEntity)GraphShape.GetNode(entity, edge);
if (e != null)
{
node.SingleEdges.Add(edge, e);
BuildEntityGraph(e, graph);
}
}
}
}
public IEnumerator <TEntity> GetEnumerator()
{
return(EntityRelationGraph.GetEnumerator());
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return(EntityRelationGraph.GetEnumerator());
}
