Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Objects / ObjectViewEntityCollectionData.cs / 1 / ObjectViewEntityCollectionData.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner jhutson // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.ComponentModel; using System.Data.Objects.DataClasses; using System.Diagnostics; namespace System.Data.Objects { ////// Manages a binding list constructed from an EntityCollection. /// ////// Type of the elements in the binding list. /// ////// Type of element in the underlying EntityCollection. /// ////// The binding list is initialized from the EntityCollection, /// and is synchronized with changes made to the EntityCollection membership. /// This class always allows additions and removals from the binding list. /// internal sealed class ObjectViewEntityCollectionData: IObjectViewData where TItemElement : class, IEntityWithRelationships where TViewElement : TItemElement { private List _bindingList; private EntityCollection _entityCollection; private readonly bool _canEditItems; /// /// True if item that was added to binding list but not underlying entity collection /// is now being committed to the collection. /// Otherwise false. /// Used by CommitItemAt and OnCollectionChanged methods to coordinate addition /// of new item to underlying entity collection. /// private bool _itemCommitPending; ////// Construct a new instance of the ObjectViewEntityCollectionData class using the supplied entityCollection. /// /// /// EntityCollection used to populate the binding list. /// internal ObjectViewEntityCollectionData(EntityCollectionentityCollection) { _entityCollection = entityCollection; _canEditItems = typeof(IEntityWithChangeTracker).IsAssignableFrom(typeof(TViewElement)); _bindingList = new List (entityCollection.Count); foreach (TViewElement entity in entityCollection) { _bindingList.Add(entity); } } #region IObjectViewData Members public IList List { get { return _bindingList; } } public bool AllowNew { get { return !_entityCollection.IsReadOnly; } } public bool AllowEdit { get { return _canEditItems; } } public bool AllowRemove { get { return !_entityCollection.IsReadOnly; } } public bool FiresEventOnAdd { get { return true; } } public bool FiresEventOnRemove { get { return true; } } public bool FiresEventOnClear { get { return true; } } public void EnsureCanAddNew() { // nop } public int Add(TViewElement item, bool isAddNew) { if (isAddNew) { // Item is added to bindingList, but pending addition to entity collection. _bindingList.Add(item); } else { _entityCollection.Add(item); // OnCollectionChanged will be fired, where the binding list will be updated. } return _bindingList.Count - 1; } public void CommitItemAt(int index) { TViewElement item = _bindingList[index]; try { _itemCommitPending = true; _entityCollection.Add(item); // OnCollectionChanged will be fired, where the binding list will be updated. } finally { _itemCommitPending = false; } } public void Clear() { if (0 < _bindingList.Count) { List _deletionList = new List (); foreach (object item in _bindingList) { _deletionList.Add(item as IEntityWithRelationships); } _entityCollection.BulkDeleteAll(_deletionList); // EntityCollection will fire change event which this instance will use to clean up the binding list. } } public bool Remove(TViewElement item, bool isCancelNew) { bool removed; if (isCancelNew) { // Item was previously added to binding list, but not entity collection. removed = _bindingList.Remove(item); } else { removed = _entityCollection.Remove(item); // OnCollectionChanged will be fired, where the binding list will be updated. } return removed; } public ListChangedEventArgs OnCollectionChanged(object sender, CollectionChangeEventArgs e, ObjectViewListener listener) { ListChangedEventArgs changeArgs = null; switch (e.Action) { case CollectionChangeAction.Remove: // An Entity is being removed from entity collection, remove it from list. if (e.Element is TViewElement) { TViewElement removedItem = (TViewElement)e.Element; int oldIndex = _bindingList.IndexOf(removedItem); if (oldIndex != -1) { _bindingList.Remove(removedItem); // Unhook from events of removed entity. listener.UnregisterEntityEvents(removedItem); changeArgs = new ListChangedEventArgs(ListChangedType.ItemDeleted, oldIndex /* newIndex*/, -1 /* oldIndex*/); } } break; case CollectionChangeAction.Add: // Add the entity to our list. if (e.Element is TViewElement) { // Do not process Add events that fire as a result of committing an item to the entity collection. if (!_itemCommitPending) { TViewElement addedItem = (TViewElement)e.Element; _bindingList.Add(addedItem); // Register to its events. listener.RegisterEntityEvents(addedItem); changeArgs = new ListChangedEventArgs(ListChangedType.ItemAdded, _bindingList.Count - 1 /* newIndex*/, -1 /* oldIndex*/); } } break; case CollectionChangeAction.Refresh: foreach (TViewElement entity in _bindingList) { Debug.Assert(entity is IEntityWithChangeTracker, "entity must be type IEntityWithChangeTracker"); listener.UnregisterEntityEvents(entity); } _bindingList.Clear(); foreach (TViewElement entity in _entityCollection) { _bindingList.Add(entity); Debug.Assert(entity is IEntityWithChangeTracker, "entity must be type IEntityWithChangeTracker"); listener.RegisterEntityEvents(entity); } changeArgs = new ListChangedEventArgs(ListChangedType.Reset, -1 /*newIndex*/, -1/*oldIndex*/); break; } return changeArgs; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner jhutson // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.ComponentModel; using System.Data.Objects.DataClasses; using System.Diagnostics; namespace System.Data.Objects { ////// Manages a binding list constructed from an EntityCollection. /// ////// Type of the elements in the binding list. /// ////// Type of element in the underlying EntityCollection. /// ////// The binding list is initialized from the EntityCollection, /// and is synchronized with changes made to the EntityCollection membership. /// This class always allows additions and removals from the binding list. /// internal sealed class ObjectViewEntityCollectionData: IObjectViewData where TItemElement : class, IEntityWithRelationships where TViewElement : TItemElement { private List _bindingList; private EntityCollection _entityCollection; private readonly bool _canEditItems; /// /// True if item that was added to binding list but not underlying entity collection /// is now being committed to the collection. /// Otherwise false. /// Used by CommitItemAt and OnCollectionChanged methods to coordinate addition /// of new item to underlying entity collection. /// private bool _itemCommitPending; ////// Construct a new instance of the ObjectViewEntityCollectionData class using the supplied entityCollection. /// /// /// EntityCollection used to populate the binding list. /// internal ObjectViewEntityCollectionData(EntityCollectionentityCollection) { _entityCollection = entityCollection; _canEditItems = typeof(IEntityWithChangeTracker).IsAssignableFrom(typeof(TViewElement)); _bindingList = new List (entityCollection.Count); foreach (TViewElement entity in entityCollection) { _bindingList.Add(entity); } } #region IObjectViewData Members public IList List { get { return _bindingList; } } public bool AllowNew { get { return !_entityCollection.IsReadOnly; } } public bool AllowEdit { get { return _canEditItems; } } public bool AllowRemove { get { return !_entityCollection.IsReadOnly; } } public bool FiresEventOnAdd { get { return true; } } public bool FiresEventOnRemove { get { return true; } } public bool FiresEventOnClear { get { return true; } } public void EnsureCanAddNew() { // nop } public int Add(TViewElement item, bool isAddNew) { if (isAddNew) { // Item is added to bindingList, but pending addition to entity collection. _bindingList.Add(item); } else { _entityCollection.Add(item); // OnCollectionChanged will be fired, where the binding list will be updated. } return _bindingList.Count - 1; } public void CommitItemAt(int index) { TViewElement item = _bindingList[index]; try { _itemCommitPending = true; _entityCollection.Add(item); // OnCollectionChanged will be fired, where the binding list will be updated. } finally { _itemCommitPending = false; } } public void Clear() { if (0 < _bindingList.Count) { List _deletionList = new List (); foreach (object item in _bindingList) { _deletionList.Add(item as IEntityWithRelationships); } _entityCollection.BulkDeleteAll(_deletionList); // EntityCollection will fire change event which this instance will use to clean up the binding list. } } public bool Remove(TViewElement item, bool isCancelNew) { bool removed; if (isCancelNew) { // Item was previously added to binding list, but not entity collection. removed = _bindingList.Remove(item); } else { removed = _entityCollection.Remove(item); // OnCollectionChanged will be fired, where the binding list will be updated. } return removed; } public ListChangedEventArgs OnCollectionChanged(object sender, CollectionChangeEventArgs e, ObjectViewListener listener) { ListChangedEventArgs changeArgs = null; switch (e.Action) { case CollectionChangeAction.Remove: // An Entity is being removed from entity collection, remove it from list. if (e.Element is TViewElement) { TViewElement removedItem = (TViewElement)e.Element; int oldIndex = _bindingList.IndexOf(removedItem); if (oldIndex != -1) { _bindingList.Remove(removedItem); // Unhook from events of removed entity. listener.UnregisterEntityEvents(removedItem); changeArgs = new ListChangedEventArgs(ListChangedType.ItemDeleted, oldIndex /* newIndex*/, -1 /* oldIndex*/); } } break; case CollectionChangeAction.Add: // Add the entity to our list. if (e.Element is TViewElement) { // Do not process Add events that fire as a result of committing an item to the entity collection. if (!_itemCommitPending) { TViewElement addedItem = (TViewElement)e.Element; _bindingList.Add(addedItem); // Register to its events. listener.RegisterEntityEvents(addedItem); changeArgs = new ListChangedEventArgs(ListChangedType.ItemAdded, _bindingList.Count - 1 /* newIndex*/, -1 /* oldIndex*/); } } break; case CollectionChangeAction.Refresh: foreach (TViewElement entity in _bindingList) { Debug.Assert(entity is IEntityWithChangeTracker, "entity must be type IEntityWithChangeTracker"); listener.UnregisterEntityEvents(entity); } _bindingList.Clear(); foreach (TViewElement entity in _entityCollection) { _bindingList.Add(entity); Debug.Assert(entity is IEntityWithChangeTracker, "entity must be type IEntityWithChangeTracker"); listener.RegisterEntityEvents(entity); } changeArgs = new ListChangedEventArgs(ListChangedType.Reset, -1 /*newIndex*/, -1/*oldIndex*/); break; } return changeArgs; } #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
- CapacityStreamGeometryContext.cs
- Msec.cs
- InputProcessorProfiles.cs
- FontSourceCollection.cs
- NodeFunctions.cs
- OdbcInfoMessageEvent.cs
- HorizontalAlignConverter.cs
- PairComparer.cs
- QilName.cs
- SqlCacheDependency.cs
- StringUtil.cs
- TerminateDesigner.cs
- Point.cs
- UnsafeNativeMethodsTablet.cs
- CheckBoxStandardAdapter.cs
- XPathEmptyIterator.cs
- GlobalItem.cs
- CategoryNameCollection.cs
- TreeNodeCollection.cs
- PkcsUtils.cs
- SqlDeflator.cs
- XPathNodePointer.cs
- LoadRetryHandler.cs
- InputLanguageEventArgs.cs
- FontStretches.cs
- EventArgs.cs
- NonClientArea.cs
- AudioFormatConverter.cs
- SerializationAttributes.cs
- DataPagerFieldItem.cs
- DefaultHttpHandler.cs
- LayoutUtils.cs
- OleCmdHelper.cs
- WmpBitmapEncoder.cs
- Parameter.cs
- DefaultSection.cs
- ToolStripGripRenderEventArgs.cs
- filewebresponse.cs
- ClockGroup.cs
- ReliableChannelFactory.cs
- DBCommand.cs
- Nullable.cs
- DataObjectAttribute.cs
- ColumnReorderedEventArgs.cs
- SafeProcessHandle.cs
- Geometry3D.cs
- RadioButtonPopupAdapter.cs
- LinearGradientBrush.cs
- BaseTreeIterator.cs
- SmtpNtlmAuthenticationModule.cs
- AQNBuilder.cs
- PathTooLongException.cs
- FixedSOMTableCell.cs
- base64Transforms.cs
- HttpProfileBase.cs
- XamlInt32CollectionSerializer.cs
- TaskFormBase.cs
- LocatorGroup.cs
- XmlHierarchicalDataSourceView.cs
- Attribute.cs
- CodeDirectionExpression.cs
- AsymmetricKeyExchangeFormatter.cs
- ExecutorLocksHeldException.cs
- CachedFontFace.cs
- SiteMapDataSource.cs
- SecurityHeader.cs
- EmptyStringExpandableObjectConverter.cs
- TextParagraphCache.cs
- StrokeDescriptor.cs
- TcpTransportBindingElement.cs
- DescriptionAttribute.cs
- CultureInfo.cs
- DelayDesigner.cs
- SqlPersonalizationProvider.cs
- StylusPointDescription.cs
- ConfigXmlWhitespace.cs
- AccessDataSource.cs
- SQLString.cs
- CodeSnippetCompileUnit.cs
- BitmapEffectOutputConnector.cs
- ConfigurationManagerInternalFactory.cs
- ResolveInfo.cs
- MetricEntry.cs
- BlockExpression.cs
- DelegateArgument.cs
- RTTypeWrapper.cs
- FlowPosition.cs
- SoapAttributeAttribute.cs
- _UriSyntax.cs
- IDQuery.cs
- TextSimpleMarkerProperties.cs
- SoapInteropTypes.cs
- _SSPISessionCache.cs
- GridViewDesigner.cs
- XmlReflectionMember.cs
- ObjectAnimationUsingKeyFrames.cs
- EventMappingSettingsCollection.cs
- WebRequestModuleElement.cs
- PageCache.cs
- ApplicationManager.cs