Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / Internal / NullEntityWrapper.cs / 1305376 / NullEntityWrapper.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections; using System.Data.Objects.DataClasses; using System.Data.Entity; using System.Data.Metadata.Edm; using System.Diagnostics; namespace System.Data.Objects.Internal { ////// Defines an entity wrapper that wraps an entity with a null value. /// This is a singleton class for which the same instance is always returned /// any time a wrapper around a null entity is requested. Objects of this /// type are immutable and mutable to allow this behavior to work correctly. /// internal class NullEntityWrapper : IEntityWrapper { private static IEntityWrapper s_nullWrapper = new NullEntityWrapper(); // Private constructor prevents anyone else from creating an instance private NullEntityWrapper() { } ////// The single instance of this class. /// internal static IEntityWrapper NullWrapper { get { return s_nullWrapper; } } public RelationshipManager RelationshipManager { get { Debug.Fail("Cannot access RelationshipManager from null wrapper."); return null; } } public bool OwnsRelationshipManager { get { Debug.Fail("Cannot access RelationshipManager from null wrapper."); return false; } } public object Entity { get { return null; } } public EntityEntry ObjectStateEntry { get { return null; } set { } } public void CollectionAdd(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot modify collection from null wrapper."); } public bool CollectionRemove(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot modify collection from null wrapper."); return false; } public EntityKey EntityKey { get { Debug.Fail("Cannot access EntityKey from null wrapper."); return null; } set { Debug.Fail("Cannot access EntityKey from null wrapper."); } } public EntityKey GetEntityKeyFromEntity() { Debug.Assert(false, "Method on NullEntityWrapper should not be called"); return null; } public ObjectContext Context { get { Debug.Fail("Cannot access Context from null wrapper."); return null; } set { Debug.Fail("Cannot access Context from null wrapper."); } } public MergeOption MergeOption { get { Debug.Fail("Cannot access MergeOption from null wrapper."); return MergeOption.NoTracking; } } public void AttachContext(ObjectContext context, EntitySet entitySet, MergeOption mergeOption) { Debug.Fail("Cannot access Context from null wrapper."); } public void ResetContext(ObjectContext context, EntitySet entitySet, MergeOption mergeOption) { Debug.Fail("Cannot access Context from null wrapper."); } public void DetachContext() { Debug.Fail("Cannot access Context from null wrapper."); } public void SetChangeTracker(IEntityChangeTracker changeTracker) { Debug.Fail("Cannot access ChangeTracker from null wrapper."); } public void TakeSnapshot(EntityEntry entry) { Debug.Fail("Cannot take snapshot of using null wrapper."); } public void TakeSnapshotOfRelationships(EntityEntry entry) { Debug.Fail("Cannot take snapshot using null wrapper."); } public Type IdentityType { get { Debug.Fail("Cannot access IdentityType from null wrapper."); return null; } } public void EnsureCollectionNotNull(RelatedEnd relatedEnd) { Debug.Fail("Cannot modify collection from null wrapper."); } public object GetNavigationPropertyValue(RelatedEnd relatedEnd) { Debug.Fail("Cannot access property using null wrapper."); return null; } public void SetNavigationPropertyValue(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot access property using null wrapper."); } public void RemoveNavigationPropertyValue(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot access property using null wrapper."); } public void SetCurrentValue(EntityEntry entry, StateManagerMemberMetadata member, int ordinal, object target, object value) { Debug.Fail("Cannot set a value onto a null entity."); } public bool InitializingProxyRelatedEnds { get { Debug.Fail("Cannot access flag on null wrapper."); return false; } set { Debug.Fail("Cannot access flag on null wrapper."); } } public void UpdateCurrentValueRecord(object value, EntityEntry entry) { Debug.Fail("Cannot UpdateCurrentValueRecord on a null entity."); } public bool RequiresRelationshipChangeTracking { get { return false; } } public bool RequiresComplexChangeTracking { get { return false; } } public bool RequiresScalarChangeTracking { get { return false; } } public bool RequiresAnyChangeTracking { get { return false; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections; using System.Data.Objects.DataClasses; using System.Data.Entity; using System.Data.Metadata.Edm; using System.Diagnostics; namespace System.Data.Objects.Internal { ////// Defines an entity wrapper that wraps an entity with a null value. /// This is a singleton class for which the same instance is always returned /// any time a wrapper around a null entity is requested. Objects of this /// type are immutable and mutable to allow this behavior to work correctly. /// internal class NullEntityWrapper : IEntityWrapper { private static IEntityWrapper s_nullWrapper = new NullEntityWrapper(); // Private constructor prevents anyone else from creating an instance private NullEntityWrapper() { } ////// The single instance of this class. /// internal static IEntityWrapper NullWrapper { get { return s_nullWrapper; } } public RelationshipManager RelationshipManager { get { Debug.Fail("Cannot access RelationshipManager from null wrapper."); return null; } } public bool OwnsRelationshipManager { get { Debug.Fail("Cannot access RelationshipManager from null wrapper."); return false; } } public object Entity { get { return null; } } public EntityEntry ObjectStateEntry { get { return null; } set { } } public void CollectionAdd(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot modify collection from null wrapper."); } public bool CollectionRemove(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot modify collection from null wrapper."); return false; } public EntityKey EntityKey { get { Debug.Fail("Cannot access EntityKey from null wrapper."); return null; } set { Debug.Fail("Cannot access EntityKey from null wrapper."); } } public EntityKey GetEntityKeyFromEntity() { Debug.Assert(false, "Method on NullEntityWrapper should not be called"); return null; } public ObjectContext Context { get { Debug.Fail("Cannot access Context from null wrapper."); return null; } set { Debug.Fail("Cannot access Context from null wrapper."); } } public MergeOption MergeOption { get { Debug.Fail("Cannot access MergeOption from null wrapper."); return MergeOption.NoTracking; } } public void AttachContext(ObjectContext context, EntitySet entitySet, MergeOption mergeOption) { Debug.Fail("Cannot access Context from null wrapper."); } public void ResetContext(ObjectContext context, EntitySet entitySet, MergeOption mergeOption) { Debug.Fail("Cannot access Context from null wrapper."); } public void DetachContext() { Debug.Fail("Cannot access Context from null wrapper."); } public void SetChangeTracker(IEntityChangeTracker changeTracker) { Debug.Fail("Cannot access ChangeTracker from null wrapper."); } public void TakeSnapshot(EntityEntry entry) { Debug.Fail("Cannot take snapshot of using null wrapper."); } public void TakeSnapshotOfRelationships(EntityEntry entry) { Debug.Fail("Cannot take snapshot using null wrapper."); } public Type IdentityType { get { Debug.Fail("Cannot access IdentityType from null wrapper."); return null; } } public void EnsureCollectionNotNull(RelatedEnd relatedEnd) { Debug.Fail("Cannot modify collection from null wrapper."); } public object GetNavigationPropertyValue(RelatedEnd relatedEnd) { Debug.Fail("Cannot access property using null wrapper."); return null; } public void SetNavigationPropertyValue(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot access property using null wrapper."); } public void RemoveNavigationPropertyValue(RelatedEnd relatedEnd, object value) { Debug.Fail("Cannot access property using null wrapper."); } public void SetCurrentValue(EntityEntry entry, StateManagerMemberMetadata member, int ordinal, object target, object value) { Debug.Fail("Cannot set a value onto a null entity."); } public bool InitializingProxyRelatedEnds { get { Debug.Fail("Cannot access flag on null wrapper."); return false; } set { Debug.Fail("Cannot access flag on null wrapper."); } } public void UpdateCurrentValueRecord(object value, EntityEntry entry) { Debug.Fail("Cannot UpdateCurrentValueRecord on a null entity."); } public bool RequiresRelationshipChangeTracking { get { return false; } } public bool RequiresComplexChangeTracking { get { return false; } } public bool RequiresScalarChangeTracking { get { return false; } } public bool RequiresAnyChangeTracking { get { return false; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XmlBindingWorker.cs
- PixelFormats.cs
- HwndSourceKeyboardInputSite.cs
- ToolstripProfessionalRenderer.cs
- SchemaEntity.cs
- TypeUtils.cs
- SqlFacetAttribute.cs
- PersianCalendar.cs
- ExpressionEvaluator.cs
- ColorAnimationUsingKeyFrames.cs
- ForceCopyBuildProvider.cs
- MulticastNotSupportedException.cs
- DbCommandDefinition.cs
- PeerCollaborationPermission.cs
- IteratorDescriptor.cs
- GlyphRunDrawing.cs
- TaskExtensions.cs
- PointAnimationBase.cs
- RelationshipSet.cs
- TimeSpanMinutesOrInfiniteConverter.cs
- ButtonColumn.cs
- BrushConverter.cs
- ProxyHelper.cs
- CompilerErrorCollection.cs
- BuildProvidersCompiler.cs
- SQLInt16Storage.cs
- XsltInput.cs
- TreeViewCancelEvent.cs
- JsonReader.cs
- Propagator.ExtentPlaceholderCreator.cs
- GradientSpreadMethodValidation.cs
- URI.cs
- SequentialActivityDesigner.cs
- ImageKeyConverter.cs
- VectorCollectionConverter.cs
- DynamicRendererThreadManager.cs
- FixedBufferAttribute.cs
- RemoteDebugger.cs
- DefaultTextStoreTextComposition.cs
- XmlAttributes.cs
- PeerNameRecordCollection.cs
- AssemblyCollection.cs
- XmlSerializableWriter.cs
- XmlSchemaValidator.cs
- ProviderSettingsCollection.cs
- EntitySetBaseCollection.cs
- DataListComponentEditor.cs
- SqlTopReducer.cs
- TemplatingOptionsDialog.cs
- HttpRequestContext.cs
- ForAllOperator.cs
- ControlBindingsConverter.cs
- Helper.cs
- SqlVersion.cs
- TextBlockAutomationPeer.cs
- Mappings.cs
- XMLSyntaxException.cs
- ToolStripOverflow.cs
- BuildDependencySet.cs
- ModifierKeysConverter.cs
- FocusChangedEventArgs.cs
- XmlSchemas.cs
- _NetworkingPerfCounters.cs
- UserNameSecurityToken.cs
- EditorPartCollection.cs
- StrongNameUtility.cs
- TraceSection.cs
- Timeline.cs
- XmlILTrace.cs
- TraceSource.cs
- Matrix3DConverter.cs
- _NegotiateClient.cs
- HandledEventArgs.cs
- ShellProvider.cs
- OdbcParameter.cs
- RowToParametersTransformer.cs
- EncoderParameters.cs
- ProgressiveCrcCalculatingStream.cs
- HotSpot.cs
- ClientProxyGenerator.cs
- BooleanKeyFrameCollection.cs
- ConstantProjectedSlot.cs
- XPathNodeList.cs
- EngineSite.cs
- LocalFileSettingsProvider.cs
- EventLogException.cs
- TreeView.cs
- CheckBox.cs
- CompiledRegexRunner.cs
- ReferentialConstraint.cs
- DbException.cs
- XmlSchemaExporter.cs
- IPPacketInformation.cs
- FormViewDeleteEventArgs.cs
- PartitionedStreamMerger.cs
- Util.cs
- Function.cs
- X509CertificateStore.cs
- FormView.cs
- SystemEvents.cs