internal void HandleDeleteEntity(object source, string sourceProperty, string sourceEntitySet, ICollection collection, object target, string targetEntitySet)
{
if (!this.Context.ApplyingChanges && ((source == null) || !this.IsDetachedOrDeletedFromContext(source)))
{
if ((this.IsContextTrackingEntity(target) && !this.DetachBehavior) && (this.CollectionChanged != null))
{
EntityCollectionChangedParams arg = new EntityCollectionChangedParams(this.Context, source, sourceProperty, sourceEntitySet, collection, target, targetEntitySet, NotifyCollectionChangedAction.Remove);
if (this.CollectionChanged(arg))
{
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);
}
}
}
}
internal void HandleAddEntity(object source, string sourceProperty, string sourceEntitySet, ICollection collection, object target, string targetEntitySet)
{
if (!this.Context.ApplyingChanges && ((source == null) || !this.IsDetachedOrDeletedFromContext(source)))
{
EntityDescriptor entityDescriptor = this.Context.GetEntityDescriptor(target);
if ((!this.AttachBehavior && ((entityDescriptor == null) || (((source != null) && !this.IsContextTrackingLink(source, sourceProperty, target)) && (entityDescriptor.State != EntityStates.Deleted)))) && (this.CollectionChanged != null))
{
EntityCollectionChangedParams arg = new EntityCollectionChangedParams(this.Context, source, sourceProperty, sourceEntitySet, collection, target, targetEntitySet, NotifyCollectionChangedAction.Add);
if (this.CollectionChanged(arg))
{
return;
}
}
if ((source != null) && this.IsDetachedOrDeletedFromContext(source))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_DetachedSource);
}
entityDescriptor = this.Context.GetEntityDescriptor(target);
if (source != null)
{
if (!this.AttachBehavior)
{
if (entityDescriptor == null)
{
this.Context.AddRelatedObject(source, sourceProperty, target);
}
else if ((entityDescriptor.State != EntityStates.Deleted) && !this.IsContextTrackingLink(source, sourceProperty, target))
{
this.Context.AddLink(source, sourceProperty, target);
}
}
else if (entityDescriptor == null)
{
BindingUtils.ValidateEntitySetName(targetEntitySet, target);
this.Context.AttachTo(targetEntitySet, target);
this.Context.AttachLink(source, sourceProperty, target);
}
else if ((entityDescriptor.State != EntityStates.Deleted) && !this.IsContextTrackingLink(source, sourceProperty, target))
{
this.Context.AttachLink(source, sourceProperty, target);
}
}
else if (entityDescriptor == null)
{
BindingUtils.ValidateEntitySetName(targetEntitySet, target);
if (this.AttachBehavior)
{
this.Context.AttachTo(targetEntitySet, target);
}
else
{
this.Context.AddObject(targetEntitySet, target);
}
}
}
}
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);
}
}
}
internal void HandleAddEntity(
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.");
if (source != null && this.IsDetachedOrDeletedFromContext(source))
{
return;
}
EntityDescriptor targetDescriptor = this.Context.GetEntityDescriptor(target);
bool contextOperationRequired = !this.AttachBehavior &&
(targetDescriptor == null ||
(source != null && !this.IsContextTrackingLink(source, sourceProperty, target) && targetDescriptor.State != EntityStates.Deleted));
if (contextOperationRequired)
{
if (this.CollectionChanged != null)
{
EntityCollectionChangedParams args = new EntityCollectionChangedParams(
this.Context,
source,
sourceProperty,
sourceEntitySet,
collection,
target,
targetEntitySet,
NotifyCollectionChangedAction.Add);
if (this.CollectionChanged(args))
{
return;
}
}
}
if (source != null && this.IsDetachedOrDeletedFromContext(source))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_DetachedSource);
}
targetDescriptor = this.Context.GetEntityDescriptor(target);
if (source != null)
{
if (this.AttachBehavior)
{
if (targetDescriptor == null)
{
BindingUtils.ValidateEntitySetName(targetEntitySet, target);
this.Context.AttachTo(targetEntitySet, target);
this.Context.AttachLink(source, sourceProperty, target);
}
else
if (targetDescriptor.State != EntityStates.Deleted && !this.IsContextTrackingLink(source, sourceProperty, target))
{
this.Context.AttachLink(source, sourceProperty, target);
}
}
else
{
if (targetDescriptor == null)
{
this.Context.AddRelatedObject(source, sourceProperty, target);
}
else
if (targetDescriptor.State != EntityStates.Deleted && !this.IsContextTrackingLink(source, sourceProperty, target))
{
this.Context.AddLink(source, sourceProperty, target);
}
}
}
else
if (targetDescriptor == null)
{
BindingUtils.ValidateEntitySetName(targetEntitySet, target);
if (this.AttachBehavior)
{
this.Context.AttachTo(targetEntitySet, target);
}
else
{
this.Context.AddObject(targetEntitySet, target);
}
}
}
/// <summary>Handle Deletes from a tracked DataServiceCollection. Perform operations on context to reflect the changes.</summary>
/// <param name="source">The source object that reference the target object through a navigation property.</param>
/// <param name="sourceProperty">The navigation property in the source object that reference the target object.</param>
/// <param name="sourceEntitySet">The entity set of the source object.</param>
/// <param name="collection">The collection containing the target object.</param>
/// <param name="target">The target entity.</param>
/// <param name="targetEntitySet">The entity set name of the target object.</param>
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.");
// Do not handle delete for already detached and deleted entities.
if (source != null && this.IsDetachedOrDeletedFromContext(source))
{
return;
}
// Do we need an operation on context to handle the Delete operation.
// Detach behavior is special because it is only applicable in Clear
// cases, where we don't callback users for detach nofications.
bool contextOperationRequired = this.IsContextTrackingEntity(target) && !this.DetachBehavior;
if (contextOperationRequired)
{
// First give the user code a chance to handle Delete operation.
if (this.CollectionChanged != null)
{
EntityCollectionChangedParams args = new EntityCollectionChangedParams(
this.Context,
source,
sourceProperty,
sourceEntitySet,
collection,
target,
targetEntitySet,
NotifyCollectionChangedAction.Remove);
if (this.CollectionChanged(args))
{
return;
}
}
}
// The user callback code could detach the source.
if (source != null && !this.IsContextTrackingEntity(source))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_DetachedSource);
}
// Default implementation.
// Remove the entity from the context if it is currently being tracked.
if (this.IsContextTrackingEntity(target))
{
if (this.DetachBehavior)
{
this.Context.Detach(target);
}
else
{
this.Context.DeleteObject(target);
}
}
}
/// <summary>Handle Adds to a tracked DataServiceCollection. Perform operations on context to reflect the changes.</summary>
/// <param name="source">The source object that reference the target object through a navigation property.</param>
/// <param name="sourceProperty">The navigation property in the source object that reference the target object.</param>
/// <param name="sourceEntitySet">The entity set of the source object.</param>
/// <param name="collection">The collection containing the target object.</param>
/// <param name="target">The target entity to attach.</param>
/// <param name="targetEntitySet">The entity set name of the target object.</param>
internal void HandleAddEntity(
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.");
// Do not handle add for already detached and deleted entities.
if (source != null && this.IsDetachedOrDeletedFromContext(source))
{
return;
}
// Do we need an operation on context to handle the Add operation.
EntityDescriptor targetDescriptor = this.Context.GetEntityDescriptor(target);
// Following are the conditions where context operation is required:
// 1. Not a call to Load or constructions i.e. we have Add behavior and not Attach behavior
// 2. Target entity is not being tracked
// 3. Target is being tracked but there is no link between the source and target entity and target is in non-deleted state
bool contextOperationRequired = !this.AttachBehavior &&
(targetDescriptor == null ||
(source != null && !this.IsContextTrackingLink(source, sourceProperty, target) && targetDescriptor.State != EntityStates.Deleted));
if (contextOperationRequired)
{
// First give the user code a chance to handle Add operation.
if (this.CollectionChanged != null)
{
EntityCollectionChangedParams args = new EntityCollectionChangedParams(
this.Context,
source,
sourceProperty,
sourceEntitySet,
collection,
target,
targetEntitySet,
NotifyCollectionChangedAction.Add);
if (this.CollectionChanged(args))
{
return;
}
}
}
// The user callback code could detach the source.
if (source != null && this.IsDetachedOrDeletedFromContext(source))
{
throw new InvalidOperationException(Strings.DataBinding_BindingOperation_DetachedSource);
}
// Default implementation.
targetDescriptor = this.Context.GetEntityDescriptor(target);
if (source != null)
{
if (this.AttachBehavior)
{
// If the target entity is not being currently tracked, we attach both the
// entity and the link between source and target entity.
if (targetDescriptor == null)
{
BindingUtils.ValidateEntitySetName(targetEntitySet, target);
this.Context.AttachTo(targetEntitySet, target);
this.Context.AttachLink(source, sourceProperty, target);
}
else
if (targetDescriptor.State != EntityStates.Deleted && !this.IsContextTrackingLink(source, sourceProperty, target))
{
// If the target is already being tracked, then we attach the link if it
// does not already exist between the source and target entities and the
// target entity is not already in Deleted state.
this.Context.AttachLink(source, sourceProperty, target);
}
}
else
{
// The target will be added and link from source to target will get established in the code
// below. Note that if there is already target present then we just try to establish the link
// however, if the link is also already established then we don't do anything.
if (targetDescriptor == null)
{
// If the entity is not tracked, that means the entity needs to
// be added to the context. We need to call AddRelatedObject,
// which adds via the parent (for e.g. POST Customers(0)/Orders).
this.Context.AddRelatedObject(source, sourceProperty, target);
}
else
if (targetDescriptor.State != EntityStates.Deleted && !this.IsContextTrackingLink(source, sourceProperty, target))
{
// If the entity is already tracked, then we just add the link.
// However, we would not do it if the target entity is already
// in a Deleted state.
this.Context.AddLink(source, sourceProperty, target);
}
}
}
else
if (targetDescriptor == null)
{
// The source is null when the DataServiceCollection is the root collection.
BindingUtils.ValidateEntitySetName(targetEntitySet, target);
if (this.AttachBehavior)
{
// Attach the target entity.
this.Context.AttachTo(targetEntitySet, target);
}
else
{
// Add the target entity.
this.Context.AddObject(targetEntitySet, target);
}
}
}
