private void AddFromProperties(object entity)
{
foreach (BindingEntityInfo.BindingPropertyInfo info in BindingEntityInfo.GetObservableProperties(entity.GetType(), this.observer.Context.MaxProtocolVersion))
{
object target = info.PropertyInfo.GetValue(entity);
if (target != null)
{
switch (info.PropertyKind)
{
case BindingPropertyKind.BindingPropertyKindEntity:
{
this.AddEntity(entity, info.PropertyInfo.PropertyName, target, null, entity);
continue;
}
case BindingPropertyKind.BindingPropertyKindDataServiceCollection:
{
this.AddDataServiceCollection(entity, info.PropertyInfo.PropertyName, target, null);
continue;
}
case BindingPropertyKind.BindingPropertyKindPrimitiveOrComplexCollection:
{
this.AddPrimitiveOrComplexCollection(entity, info.PropertyInfo.PropertyName, target, info.PropertyInfo.PrimitiveOrComplexCollectionItemType);
continue;
}
}
this.AddComplexObject(entity, info.PropertyInfo.PropertyName, target);
}
}
}
private object GetCollectionInstance(ClientPropertyAnnotation property, out bool instanceCreated)
{
instanceCreated = false;
object obj2 = property.GetValue(this.entity);
if (obj2 != null)
{
return(obj2);
}
instanceCreated = true;
Type propertyType = property.PropertyType;
if (BindingEntityInfo.IsDataServiceCollection(propertyType, base.RequestInfo.MaxProtocolVersion))
{
object[] args = new object[2];
args[1] = TrackingMode.None;
return(Activator.CreateInstance(WebUtil.GetDataServiceCollectionOfT(new Type[] { property.EntityCollectionItemType }), args));
}
Type c = typeof(List <>).MakeGenericType(new Type[] { property.EntityCollectionItemType });
if (!propertyType.IsAssignableFrom(c))
{
c = propertyType;
}
return(Activator.CreateInstance(c));
}
private void OnAddToCollection(
NotifyCollectionChangedEventArgs eventArgs,
object source,
String sourceProperty,
String targetEntitySet,
object collection)
{
Debug.Assert(collection != null, "Must have a valid collection to which entities are added.");
if (eventArgs.NewItems != null)
{
foreach (object target in eventArgs.NewItems)
{
if (target == null)
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNull("Add"));
}
if (!BindingEntityInfo.IsEntityType(target.GetType()))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNotEntity("Add"));
}
this.bindingGraph.AddEntity(
source,
sourceProperty,
target,
targetEntitySet,
collection);
}
}
}
/// <summary>
/// Tries to get the value of a property and corresponding BindingPropertyInfo or ClientPropertyAnnotation if the property exists
/// </summary>
/// <param name="source">Source object whose property needs to be read</param>
/// <param name="sourceProperty">Name of the source object property</param>
/// <param name="model">The client model.</param>
/// <param name="bindingPropertyInfo">BindingPropertyInfo corresponding to <paramref name="sourceProperty"/></param>
/// <param name="clientProperty">Instance of ClientProperty corresponding to <paramref name="sourceProperty"/></param>
/// <param name="propertyValue">Value of the property</param>
/// <returns>true if the property exists and the value was read; otherwise false.</returns>
internal static bool TryGetPropertyValue(object source, string sourceProperty, ClientEdmModel model, out BindingPropertyInfo bindingPropertyInfo, out ClientPropertyAnnotation clientProperty, out object propertyValue)
{
Type sourceType = source.GetType();
bindingPropertyInfo = BindingEntityInfo.GetObservableProperties(sourceType, model)
.SingleOrDefault(x => x.PropertyInfo.PropertyName == sourceProperty);
bool propertyFound = bindingPropertyInfo != null;
// bindingPropertyInfo is null for primitive properties.
if (!propertyFound)
{
clientProperty = BindingEntityInfo.GetClientType(sourceType, model)
.GetProperty(sourceProperty, true);
propertyFound = clientProperty != null;
if (!propertyFound)
{
propertyValue = null;
}
else
{
propertyValue = clientProperty.GetValue(source);
}
}
else
{
clientProperty = null;
propertyValue = bindingPropertyInfo.PropertyInfo.GetValue(source);
}
return(propertyFound);
}
private void HandleUpdateEntity(object entity, string propertyName, object propertyValue)
{
if (!this.Context.ApplyingChanges)
{
if (!BindingEntityInfo.IsEntityType(entity.GetType(), this.Context.MaxProtocolVersion))
{
this.bindingGraph.GetAncestorEntityForComplexProperty(ref entity, ref propertyName, ref propertyValue);
}
if (!this.IsDetachedOrDeletedFromContext(entity))
{
if (this.EntityChanged != null)
{
EntityChangedParams arg = new EntityChangedParams(this.Context, entity, propertyName, propertyValue, null, null);
if (this.EntityChanged(arg))
{
return;
}
}
if (this.IsContextTrackingEntity(entity))
{
this.Context.UpdateObject(entity);
}
}
}
}
public void RemoveNonTrackedEntities()
{
foreach (object obj2 in this.graph.Select(o => BindingEntityInfo.IsEntityType(o.GetType(), this.observer.Context.MaxProtocolVersion) && !this.observer.IsContextTrackingEntity(o)))
{
this.graph.ClearEdgesForVertex(this.graph.LookupVertex(obj2));
}
this.RemoveUnreachableVertices();
}
public void RemoveNonTrackedEntities()
{
foreach (var entity in this.graph.Select(o => BindingEntityInfo.IsEntityType(o.GetType()) && !this.observer.IsContextTrackingEntity(o)))
{
this.graph.ClearEdgesForVertex(this.graph.LookupVertex(entity));
}
this.RemoveUnreachableVertices();
}
private bool IsDetachedOrDeletedFromContext(object entity)
{
Debug.Assert(entity != null, "entity must be provided.");
Debug.Assert(BindingEntityInfo.IsEntityType(entity.GetType()), "entity must be an entity with keys.");
EntityDescriptor descriptor = this.Context.GetEntityDescriptor(entity);
return(descriptor == null || descriptor.State == EntityStates.Deleted);
}
private void ValidateDataServiceCollectionItem(object target)
{
if (target == null)
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNull("Remove"));
}
if (!BindingEntityInfo.IsEntityType(target.GetType(), this.Context.MaxProtocolVersion))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNotEntity("Remove"));
}
}
internal static void VerifyObserverNotPresent <T>(object oec, string sourceProperty, Type sourceType)
{
Debug.Assert(BindingEntityInfo.IsDataServiceCollection(oec.GetType()), "Must be an DataServiceCollection.");
DataServiceCollection <T> typedCollection = oec as DataServiceCollection <T>;
if (typedCollection.Observer != null)
{
throw new InvalidOperationException(Strings.DataBinding_CollectionPropertySetterValueHasObserver(sourceProperty, sourceType));
}
}
private bool IsContextTrackingLink(object source, string sourceProperty, object target)
{
Debug.Assert(source != null, "source entity must be provided.");
Debug.Assert(BindingEntityInfo.IsEntityType(source.GetType()), "source must be an entity with keys.");
Debug.Assert(!String.IsNullOrEmpty(sourceProperty), "sourceProperty must be provided.");
Debug.Assert(target != null, "target entity must be provided.");
Debug.Assert(BindingEntityInfo.IsEntityType(target.GetType()), "target must be an entity with keys.");
return(this.Context.GetLinkDescriptor(source, sourceProperty, target) != default(LinkDescriptor));
}
private void ValidateCollectionItem(object target)
{
if (target == null)
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNull("Remove"));
}
if (!BindingEntityInfo.IsEntityType(target.GetType()))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNotEntity("Remove"));
}
}
/// <summary>
/// Determine if the specified type is an entity type.
/// </summary>
/// <param name="type">An object type specifier.</param>
/// <param name="model">The client model.</param>
/// <returns>true if the type is an entity type; otherwise false.</returns>
internal static bool IsEntityType(Type type, ClientEdmModel model)
{
Debug.Assert(type != null, "Argument 'type' cannot be null.");
metadataCacheLock.EnterReadLock();
try
{
if (knownNonEntityTypes.Contains(type))
{
return(false);
}
}
finally
{
metadataCacheLock.ExitReadLock();
}
bool isEntityType;
try
{
if (BindingEntityInfo.IsDataServiceCollection(type, model))
{
return(false);
}
isEntityType = ClientTypeUtil.TypeOrElementTypeIsEntity(type);
}
catch (InvalidOperationException)
{
isEntityType = false;
}
if (!isEntityType)
{
metadataCacheLock.EnterWriteLock();
try
{
if (!knownNonEntityTypes.Contains(type))
{
knownNonEntityTypes.Add(type);
}
}
finally
{
metadataCacheLock.ExitWriteLock();
}
}
return(isEntityType);
}
/// <summary>
/// Handle changes to an entity object tracked by the BindingObserver
/// </summary>
/// <param name="entity">The entity object that has changed.</param>
/// <param name="propertyName">The property of the target entity object that has changed.</param>
/// <param name="propertyValue">The value of the changed property of the target object.</param>
private void HandleUpdateEntity(object entity, string propertyName, object propertyValue)
{
Debug.Assert(!this.AttachBehavior || this.Context.ApplyingChanges, "Entity updates must not happen during Attach or construction phases, deserialization case is the exception.");
if (this.Context.ApplyingChanges)
{
return;
}
// For complex types, we will perform notification and update on the closest ancestor entity using the farthest ancestor complex property.
if (!BindingEntityInfo.IsEntityType(entity.GetType()))
{
this.bindingGraph.GetAncestorEntityForComplexProperty(ref entity, ref propertyName, ref propertyValue);
}
Debug.Assert(entity != null, "entity must be provided for update operations.");
Debug.Assert(BindingEntityInfo.IsEntityType(entity.GetType()), "entity must be an entity with keys.");
Debug.Assert(!String.IsNullOrEmpty(propertyName) || propertyValue == null, "When propertyName is null no propertyValue should be provided.");
// Do not handle update for detached and deleted entities.
if (this.IsDetachedOrDeletedFromContext(entity))
{
return;
}
// First give the user code a chance to handle Update operation.
if (this.EntityChanged != null)
{
EntityChangedParams args = new EntityChangedParams(
this.Context,
entity,
propertyName,
propertyValue,
null,
null);
if (this.EntityChanged(args))
{
return;
}
}
// Default implementation.
// The user callback code could detach the entity.
if (this.IsContextTrackingEntity(entity))
{
// Let UpdateObject check the state of the entity.
this.Context.UpdateObject(entity);
}
}
/// <summary>
/// Removes the <paramref name="item"/> from the binding graph
/// </summary>
/// <param name="item">Item to remove</param>
/// <param name="parent">Parent of the <paramref name="item"/></param>
/// <param name="parentProperty">Parent property that refers to <paramref name="item"/></param>
public void Remove(object item, object parent, string parentProperty)
{
Vertex vertexToRemove = this.graph.LookupVertex(item);
if (vertexToRemove == null)
{
return;
}
Debug.Assert(!vertexToRemove.IsRootCollection, "Root collections are never removed");
// Parent will always be non-null for deletes from collections, this will include
// both root and child collections. For root collections, parentProperty will be null.
Debug.Assert(parent != null, "Parent has to be present.");
// When parentProperty is null, parent is itself a root collection
if (parentProperty != null)
{
BindingEntityInfo.BindingPropertyInfo bpi = BindingEntityInfo.GetObservableProperties(parent.GetType())
.Single(p => p.PropertyInfo.PropertyName == parentProperty);
Debug.Assert(bpi.PropertyKind == BindingPropertyKind.BindingPropertyKindCollection, "parentProperty must refer to an DataServiceCollection");
parent = bpi.PropertyInfo.GetValue(parent);
}
object source = null;
string sourceProperty = null;
string sourceEntitySet = null;
string targetEntitySet = null;
this.GetEntityCollectionInfo(
parent,
out source,
out sourceProperty,
out sourceEntitySet,
out targetEntitySet);
targetEntitySet = BindingEntityInfo.GetEntitySet(item, targetEntitySet);
this.observer.HandleDeleteEntity(
source,
sourceProperty,
sourceEntitySet,
parent as ICollection,
item,
targetEntitySet);
this.graph.RemoveEdge(parent, item, null);
}
internal static string GetEntitySet(
object target,
string targetEntitySet)
{
Debug.Assert(target != null, "Argument 'target' cannot be null.");
Debug.Assert(BindingEntityInfo.IsEntityType(target.GetType()), "Argument 'target' must be an entity type.");
if (!String.IsNullOrEmpty(targetEntitySet))
{
return(targetEntitySet);
}
else
{
return(BindingEntityInfo.GetEntitySetAttribute(target.GetType()));
}
}
private void OnAddToDataServiceCollection(NotifyCollectionChangedEventArgs eventArgs, object source, string sourceProperty, string targetEntitySet, object collection)
{
if (eventArgs.NewItems != null)
{
foreach (object obj2 in eventArgs.NewItems)
{
if (obj2 == null)
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNull("Add"));
}
if (!BindingEntityInfo.IsEntityType(obj2.GetType(), this.Context.MaxProtocolVersion))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_ArrayItemNotEntity("Add"));
}
this.bindingGraph.AddEntity(source, sourceProperty, obj2, targetEntitySet, collection);
}
}
}
internal static object GetPropertyValue(object source, string sourceProperty, out BindingPropertyInfo bindingPropertyInfo)
{
Type sourceType = source.GetType();
bindingPropertyInfo = BindingEntityInfo.GetObservableProperties(sourceType)
.SingleOrDefault(x => x.PropertyInfo.PropertyName == sourceProperty);
if (bindingPropertyInfo == null)
{
return(BindingEntityInfo.GetClientType(sourceType)
.GetProperty(sourceProperty, false)
.GetValue(source));
}
else
{
return(bindingPropertyInfo.PropertyInfo.GetValue(source));
}
}
/// <summary>
/// Determine if the specified type is an entity type.
/// </summary>
/// <param name="type">An object type specifier.</param>
/// <returns>True if the type is an entity type; otherwise false.</returns>
internal static bool IsEntityType(Type type)
{
Debug.Assert(type != null, "Argument 'type' cannot be null.");
metadataCacheLock.EnterReadLock();
try
{
if (knownNonEntityTypes.Contains(type))
{
return(false);
}
}
finally
{
metadataCacheLock.ExitReadLock();
}
try
{
if (BindingEntityInfo.IsDataServiceCollection(type))
{
return(false);
}
return(ClientType.Create(type).IsEntityType);
}
catch (InvalidOperationException)
{
metadataCacheLock.EnterWriteLock();
try
{
if (!knownNonEntityTypes.Contains(type))
{
knownNonEntityTypes.Add(type);
}
}
finally
{
metadataCacheLock.ExitWriteLock();
}
return(false);
}
}
private void HandleUpdateEntity(object entity, string propertyName, object propertyValue)
{
Debug.Assert(!this.AttachBehavior || this.Context.ApplyingChanges, "Entity updates must not happen during Attach or construction phases, deserialization case is the exception.");
if (this.Context.ApplyingChanges)
{
return;
}
if (!BindingEntityInfo.IsEntityType(entity.GetType()))
{
this.bindingGraph.GetAncestorEntityForComplexProperty(ref entity, ref propertyName, ref propertyValue);
}
Debug.Assert(entity != null, "entity must be provided for update operations.");
Debug.Assert(BindingEntityInfo.IsEntityType(entity.GetType()), "entity must be an entity with keys.");
Debug.Assert(!String.IsNullOrEmpty(propertyName) || propertyValue == null, "When propertyName is null no propertyValue should be provided.");
if (this.IsDetachedOrDeletedFromContext(entity))
{
return;
}
if (this.EntityChanged != null)
{
EntityChangedParams args = new EntityChangedParams(
this.Context,
entity,
propertyName,
propertyValue,
null,
null);
if (this.EntityChanged(args))
{
return;
}
}
if (this.IsContextTrackingEntity(entity))
{
this.Context.UpdateObject(entity);
}
}
/// <summary>Add items to the graph, from the <paramref name="entity"/> object's properties</summary>
/// <param name="entity">Object whose properties are to be explored</param>
private void AddFromProperties(object entity)
{
// Once the entity is attached to the graph, we need to traverse all it's properties
// and add related entities and collections to this entity.
foreach (BindingEntityInfo.BindingPropertyInfo bpi in BindingEntityInfo.GetObservableProperties(entity.GetType()))
{
object propertyValue = bpi.PropertyInfo.GetValue(entity);
if (propertyValue != null)
{
switch (bpi.PropertyKind)
{
case BindingPropertyKind.BindingPropertyKindCollection:
this.AddCollection(
entity,
bpi.PropertyInfo.PropertyName,
propertyValue,
null);
break;
case BindingPropertyKind.BindingPropertyKindEntity:
this.AddEntity(
entity,
bpi.PropertyInfo.PropertyName,
propertyValue,
null,
entity);
break;
default:
Debug.Assert(bpi.PropertyKind == BindingPropertyKind.BindingPropertyKindComplex, "Must be complex type if PropertyKind is not entity or collection.");
this.AddComplexProperty(
entity,
bpi.PropertyInfo.PropertyName,
propertyValue);
break;
}
}
}
}
internal void StartTracking <T>(DataServiceCollection <T> collection, string collectionEntitySet)
{
Debug.Assert(collection != null, "Only constructed collections are tracked.");
if (!BindingEntityInfo.IsEntityType(typeof(T)))
{
throw new ArgumentException(Strings.DataBinding_DataServiceCollectionArgumentMustHaveEntityType(typeof(T)));
}
try
{
this.AttachBehavior = true;
this.bindingGraph.AddCollection(null, null, collection, collectionEntitySet);
}
finally
{
this.AttachBehavior = false;
}
}
private void AddFromProperties(object entity)
{
foreach (BindingEntityInfo.BindingPropertyInfo bpi in BindingEntityInfo.GetObservableProperties(entity.GetType()))
{
object propertyValue = bpi.PropertyInfo.GetValue(entity);
if (propertyValue != null)
{
switch (bpi.PropertyKind)
{
case BindingPropertyKind.BindingPropertyKindCollection:
this.AddCollection(
entity,
bpi.PropertyInfo.PropertyName,
propertyValue,
null);
break;
case BindingPropertyKind.BindingPropertyKindEntity:
this.AddEntity(
entity,
bpi.PropertyInfo.PropertyName,
propertyValue,
null,
entity);
break;
default:
Debug.Assert(bpi.PropertyKind == BindingPropertyKind.BindingPropertyKindComplex, "Must be complex type if PropertyKind is not entity or collection.");
this.AddComplexProperty(
entity,
bpi.PropertyInfo.PropertyName,
propertyValue);
break;
}
}
}
}
private void StartTracking(DataServiceContext context, IEnumerable <T> items, string entitySet, Func <EntityChangedParams, bool> entityChanged, Func <EntityCollectionChangedParams, bool> collectionChanged)
{
if (!BindingEntityInfo.IsEntityType(typeof(T), context.MaxProtocolVersion))
{
throw new ArgumentException(Strings.DataBinding_DataServiceCollectionArgumentMustHaveEntityType(typeof(T)));
}
this.observer = new BindingObserver(context, entityChanged, collectionChanged);
if (items != null)
{
try
{
this.InternalLoadCollection(items);
}
catch
{
this.observer = null;
throw;
}
}
this.observer.StartTracking <T>((DataServiceCollection <T>) this, entitySet);
this.rootCollection = true;
}
/// <summary>
/// Get the entity set name for the target entity object.
/// </summary>
/// <param name="target">An entity object.</param>
/// <param name="targetEntitySet">The 'currently known' entity set name for the target object.</param>
/// <returns>The entity set name for the target object.</returns>
/// <remarks>
/// Allow user code to provide the entity set name. If user code does not provide the entity set name, then
/// this method will get the entity set name from the value of the EntitySetAttribute.
/// The 'currently known' entity set name for top level collections can be provided through OEC constructor
/// </remarks>
internal static string GetEntitySet(
object target,
string targetEntitySet)
{
Debug.Assert(target != null, "Argument 'target' cannot be null.");
Debug.Assert(BindingEntityInfo.IsEntityType(target.GetType()), "Argument 'target' must be an entity type.");
// Here's the rules in order of priority for resolving entity set name
// 1. EntitySet name passed in the constructor or extension methods of DataServiceCollection
// 2. EntitySet name specified in the EntitySet attribute by the code gen. {Remember this attribute is
// not generated in case of MEST)
if (!String.IsNullOrEmpty(targetEntitySet))
{
return(targetEntitySet);
}
else
{
// If there is not a 'currently known' entity set name to validate against, then there must be
// EntitySet attribute on the entity type
return(BindingEntityInfo.GetEntitySetAttribute(target.GetType()));
}
}
public bool AddEntity(object source, string sourceProperty, object target, string targetEntitySet, object edgeSource)
{
Vertex vertex = this.graph.LookupVertex(edgeSource);
Vertex vertex2 = null;
bool flag = false;
if (target != null)
{
vertex2 = this.graph.LookupVertex(target);
if (vertex2 == null)
{
vertex2 = this.graph.AddVertex(target);
vertex2.EntitySet = BindingEntityInfo.GetEntitySet(target, targetEntitySet, this.observer.Context.MaxProtocolVersion);
if (!this.AttachEntityOrComplexObjectNotification(target))
{
throw new InvalidOperationException(System.Data.Services.Client.Strings.DataBinding_NotifyPropertyChangedNotImpl(target.GetType()));
}
flag = true;
}
if (this.graph.ExistsEdge(edgeSource, target, vertex.IsDataServiceCollection ? null : sourceProperty))
{
throw new InvalidOperationException(System.Data.Services.Client.Strings.DataBinding_EntityAlreadyInCollection(target.GetType()));
}
this.graph.AddEdge(edgeSource, target, vertex.IsDataServiceCollection ? null : sourceProperty);
}
if (!vertex.IsDataServiceCollection)
{
this.observer.HandleUpdateEntityReference(source, sourceProperty, vertex.EntitySet, target, (vertex2 == null) ? null : vertex2.EntitySet);
}
else
{
this.observer.HandleAddEntity(source, sourceProperty, (vertex.Parent != null) ? vertex.Parent.EntitySet : null, edgeSource as ICollection, target, vertex2.EntitySet);
}
if (flag)
{
this.AddFromProperties(target);
}
return(flag);
}
/// <summary>Start tracking the specified DataServiceCollection.</summary>
/// <typeparam name="T">An entity type.</typeparam>
/// <param name="collection">An DataServiceCollection.</param>
/// <param name="collectionEntitySet">The entity set of the elements in <paramref name="collection"/>.</param>
internal void StartTracking <T>(DataServiceCollection <T> collection, string collectionEntitySet)
{
Debug.Assert(collection != null, "Only constructed collections are tracked.");
// Verify that T corresponds to an entity type.
if (!BindingEntityInfo.IsEntityType(typeof(T)))
{
throw new ArgumentException(Strings.DataBinding_DataServiceCollectionArgumentMustHaveEntityType(typeof(T)));
}
try
{
this.AttachBehavior = true;
// Recursively traverse the entire object graph under the root collection.
this.bindingGraph.AddCollection(null, null, collection, collectionEntitySet);
}
finally
{
this.AttachBehavior = false;
}
}
public void RemoveDataServiceCollectionItem(object item, object parent, string parentProperty)
{
Func <BindingEntityInfo.BindingPropertyInfo, bool> predicate = null;
if (this.graph.LookupVertex(item) != null)
{
if (parentProperty != null)
{
if (predicate == null)
{
predicate = p => p.PropertyInfo.PropertyName == parentProperty;
}
parent = BindingEntityInfo.GetObservableProperties(parent.GetType(), this.observer.Context.MaxProtocolVersion).Single <BindingEntityInfo.BindingPropertyInfo>(predicate).PropertyInfo.GetValue(parent);
}
object source = null;
string sourceProperty = null;
string sourceEntitySet = null;
string targetEntitySet = null;
this.GetDataServiceCollectionInfo(parent, out source, out sourceProperty, out sourceEntitySet, out targetEntitySet);
targetEntitySet = BindingEntityInfo.GetEntitySet(item, targetEntitySet, this.observer.Context.MaxProtocolVersion);
this.observer.HandleDeleteEntity(source, sourceProperty, sourceEntitySet, parent as ICollection, item, targetEntitySet);
this.graph.RemoveEdge(parent, item, null);
}
}
internal void HandleUpdateEntityReference(
object source,
string sourceProperty,
string sourceEntitySet,
object target,
string targetEntitySet)
{
if (this.Context.ApplyingChanges)
{
return;
}
Debug.Assert(source != null, "source can not be null for update operations.");
Debug.Assert(BindingEntityInfo.IsEntityType(source.GetType()), "source must be an entity with keys.");
Debug.Assert(!String.IsNullOrEmpty(sourceProperty), "sourceProperty must be a non-empty string for update operations.");
Debug.Assert(!String.IsNullOrEmpty(sourceEntitySet), "sourceEntitySet must be non-empty string for update operation.");
if (this.IsDetachedOrDeletedFromContext(source))
{
return;
}
EntityDescriptor targetDescriptor = target != null?this.Context.GetEntityDescriptor(target) : null;
bool contextOperationRequired = !this.AttachBehavior &&
(targetDescriptor == null ||
!this.IsContextTrackingLink(source, sourceProperty, target));
if (contextOperationRequired)
{
if (this.EntityChanged != null)
{
EntityChangedParams args = new EntityChangedParams(
this.Context,
source,
sourceProperty,
target,
sourceEntitySet,
targetEntitySet);
if (this.EntityChanged(args))
{
return;
}
}
}
if (this.IsDetachedOrDeletedFromContext(source))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_DetachedSource);
}
targetDescriptor = target != null?this.Context.GetEntityDescriptor(target) : null;
if (target != null)
{
if (targetDescriptor == null)
{
BindingUtils.ValidateEntitySetName(targetEntitySet, target);
if (this.AttachBehavior)
{
this.Context.AttachTo(targetEntitySet, target);
}
else
{
this.Context.AddObject(targetEntitySet, target);
}
targetDescriptor = this.Context.GetEntityDescriptor(target);
}
if (!this.IsContextTrackingLink(source, sourceProperty, target))
{
if (this.AttachBehavior)
{
if (targetDescriptor.State != EntityStates.Deleted)
{
this.Context.AttachLink(source, sourceProperty, target);
}
}
else
{
this.Context.SetLink(source, sourceProperty, target);
}
}
}
else
{
Debug.Assert(!this.AttachBehavior, "During attach operations we must never perform operations for null values.");
this.Context.SetLink(source, sourceProperty, null);
}
}
internal void HandleDeleteEntity(
object source,
string sourceProperty,
string sourceEntitySet,
ICollection collection,
object target,
string targetEntitySet)
{
if (this.Context.ApplyingChanges)
{
return;
}
Debug.Assert(
(source == null && sourceProperty == null) || (source != null && !String.IsNullOrEmpty(sourceProperty)),
"source and sourceProperty should either both be present or both be absent.");
Debug.Assert(target != null, "target must be provided by the caller.");
Debug.Assert(BindingEntityInfo.IsEntityType(target.GetType()), "target must be an entity type.");
Debug.Assert(!this.AttachBehavior, "AttachBehavior is only allowed during Construction and Load when this method should never be entered.");
if (source != null && this.IsDetachedOrDeletedFromContext(source))
{
return;
}
bool contextOperationRequired = this.IsContextTrackingEntity(target) && !this.DetachBehavior;
if (contextOperationRequired)
{
if (this.CollectionChanged != null)
{
EntityCollectionChangedParams args = new EntityCollectionChangedParams(
this.Context,
source,
sourceProperty,
sourceEntitySet,
collection,
target,
targetEntitySet,
NotifyCollectionChangedAction.Remove);
if (this.CollectionChanged(args))
{
return;
}
}
}
if (source != null && !this.IsContextTrackingEntity(source))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_DetachedSource);
}
if (this.IsContextTrackingEntity(target))
{
if (this.DetachBehavior)
{
this.Context.Detach(target);
}
else
{
this.Context.DeleteObject(target);
}
}
}
