Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / EntitySet.cs / 1305376 / EntitySet.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Text; using System.Diagnostics; using System.Threading; using System.Data.Common.Utils; using System.Collections.ObjectModel; namespace System.Data.Metadata.Edm { ////// concrete Class for representing a entity set /// public class EntitySet : EntitySetBase { #region Constructors ////// The constructor for constructing the EntitySet with a given name and an entity type /// /// The name of the EntitySet /// The db schema /// The db table /// The provider specific query that should be used to retrieve the EntitySet /// The entity type of the entities that this entity set type contains ///Thrown if the argument name or entityType is null internal EntitySet(string name, string schema, string table, string definingQuery, EntityType entityType) : base(name, schema, table, definingQuery, entityType) { } #endregion #region Fields private ReadOnlyCollection> _foreignKeyDependents; private ReadOnlyCollection > _foreignKeyPrincipals; private volatile bool _hasForeignKeyRelationships; private volatile bool _hasIndependentRelationships; #endregion #region Properties /// /// Returns the kind of the type /// public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.EntitySet; } } ////// Gets/Sets the entity type of this entity set /// public new EntityType ElementType { get { return (EntityType)base.ElementType; } } ////// Returns the associations and constraints where "this" EntitySet particpates as the Principal end. /// From the results of this list, you can retrieve the Dependent IRelatedEnds /// internal ReadOnlyCollection> ForeignKeyDependents { get { if (_foreignKeyDependents == null) { InitializeForeignKeyLists(); } return _foreignKeyDependents; } } /// /// Returns the associations and constraints where "this" EntitySet particpates as the Dependent end. /// From the results of this list, you can retrieve the Principal IRelatedEnds /// internal ReadOnlyCollection> ForeignKeyPrincipals { get { if (_foreignKeyPrincipals == null) { InitializeForeignKeyLists(); } return _foreignKeyPrincipals; } } /// /// True if this entity set participates in any foreign key relationships, otherwise false. /// internal bool HasForeignKeyRelationships { get { if (_foreignKeyPrincipals == null) { InitializeForeignKeyLists(); } return _hasForeignKeyRelationships; } } ////// True if this entity set participates in any independent relationships, otherwise false. /// internal bool HasIndependentRelationships { get { if (_foreignKeyPrincipals == null) { InitializeForeignKeyLists(); } return _hasIndependentRelationships; } } #endregion #region Methods private void InitializeForeignKeyLists() { var dependents = new List>(); var principals = new List >(); bool foundFkRelationship = false; bool foundIndependentRelationship = false; foreach (AssociationSet associationSet in MetadataHelper.GetAssociationsForEntitySet(this)) { if (associationSet.ElementType.IsForeignKey) { foundFkRelationship = true; Debug.Assert(associationSet.ElementType.ReferentialConstraints.Count == 1, "Expected exactly one constraint for FK"); ReferentialConstraint constraint = associationSet.ElementType.ReferentialConstraints[0]; if (constraint.ToRole.GetEntityType().IsAssignableFrom(this.ElementType) || this.ElementType.IsAssignableFrom(constraint.ToRole.GetEntityType())) { // Dependents dependents.Add(new Tuple (associationSet, constraint)); } if (constraint.FromRole.GetEntityType().IsAssignableFrom(this.ElementType) || this.ElementType.IsAssignableFrom(constraint.FromRole.GetEntityType())) { // Principals principals.Add(new Tuple (associationSet, constraint)); } } else { foundIndependentRelationship = true; } } _hasForeignKeyRelationships = foundFkRelationship; _hasIndependentRelationships = foundIndependentRelationship; var readOnlyDependents = dependents.AsReadOnly(); var readOnlyPrincipals = principals.AsReadOnly(); Interlocked.CompareExchange(ref _foreignKeyDependents, readOnlyDependents, null); Interlocked.CompareExchange(ref _foreignKeyPrincipals, readOnlyPrincipals, null); } #endregion } } // 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
- ControlAdapter.cs
- documentsequencetextcontainer.cs
- GridViewUpdatedEventArgs.cs
- TextEmbeddedObject.cs
- Vector3DKeyFrameCollection.cs
- OdbcRowUpdatingEvent.cs
- ProfileModule.cs
- CursorConverter.cs
- SoapRpcMethodAttribute.cs
- _UriSyntax.cs
- EmissiveMaterial.cs
- XMLSyntaxException.cs
- StreamGeometry.cs
- ProxyWebPart.cs
- CustomCategoryAttribute.cs
- SafeRightsManagementEnvironmentHandle.cs
- TdsEnums.cs
- ItemCheckedEvent.cs
- WeakReferenceList.cs
- SelectionItemPatternIdentifiers.cs
- GraphicsContext.cs
- ClientData.cs
- StopStoryboard.cs
- NamedPipeChannelFactory.cs
- Grant.cs
- MarkupProperty.cs
- HMACRIPEMD160.cs
- RequestCacheManager.cs
- WebPartZone.cs
- EntityRecordInfo.cs
- SpanIndex.cs
- SiteIdentityPermission.cs
- UDPClient.cs
- TraceSwitch.cs
- WeakReferenceList.cs
- WebPartEditVerb.cs
- WpfKnownMemberInvoker.cs
- ClientBuildManagerCallback.cs
- HtmlInputText.cs
- SrgsToken.cs
- AsnEncodedData.cs
- DbModificationClause.cs
- StringValueConverter.cs
- CngUIPolicy.cs
- XPathItem.cs
- TextBoxView.cs
- Converter.cs
- KeyValueConfigurationElement.cs
- DirtyTextRange.cs
- Group.cs
- DependencyPropertyDescriptor.cs
- AsymmetricKeyExchangeFormatter.cs
- EntityTypeBase.cs
- DiscoveryReferences.cs
- CompiledXpathExpr.cs
- Mutex.cs
- HiddenField.cs
- XmlSchemaElement.cs
- RangeValueProviderWrapper.cs
- ScrollChrome.cs
- DynamicQueryableWrapper.cs
- IxmlLineInfo.cs
- DataGridViewRowCancelEventArgs.cs
- MenuAutomationPeer.cs
- StrongNameUtility.cs
- RotateTransform.cs
- BufferedStream2.cs
- ChangeBlockUndoRecord.cs
- PackageStore.cs
- CompositeScriptReferenceEventArgs.cs
- OdbcDataReader.cs
- TableLayoutSettings.cs
- XmlUtf8RawTextWriter.cs
- ObjectMemberMapping.cs
- AnnouncementService.cs
- CultureInfoConverter.cs
- WebRequestModuleElement.cs
- CannotUnloadAppDomainException.cs
- GPRECTF.cs
- EndpointConfigContainer.cs
- RestClientProxyHandler.cs
- IPipelineRuntime.cs
- WorkflowServiceHostFactory.cs
- EventListener.cs
- DeobfuscatingStream.cs
- View.cs
- SelectionGlyphBase.cs
- PerformanceCountersElement.cs
- ScrollItemProviderWrapper.cs
- HttpProfileGroupBase.cs
- Matrix.cs
- IUnknownConstantAttribute.cs
- NumericPagerField.cs
- AnnotationHighlightLayer.cs
- PixelFormats.cs
- WebEventCodes.cs
- WsatServiceAddress.cs
- DataGridViewRowHeightInfoPushedEventArgs.cs
- PerformanceCounterPermissionAttribute.cs
- ConfigXmlDocument.cs