Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / DataViewListener.cs / 1305376 / DataViewListener.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data { using System; using System.ComponentModel; using System.Collections.Generic; using System.Diagnostics; internal sealed class DataViewListener { private readonly WeakReference _dvWeak; private DataTable _table; private Index _index; ///internal readonly int ObjectID; internal DataViewListener(DataView dv) { this.ObjectID = dv.ObjectID; _dvWeak = new WeakReference(dv); } private void ChildRelationCollectionChanged(object sender, CollectionChangeEventArgs e) { DataView dv = (DataView)_dvWeak.Target; if (dv != null) { dv.ChildRelationCollectionChanged(sender, e); } else { CleanUp(true); } } private void ParentRelationCollectionChanged(object sender, CollectionChangeEventArgs e) { DataView dv = (DataView)_dvWeak.Target; if (dv != null) { dv.ParentRelationCollectionChanged(sender, e); } else { CleanUp(true); } } private void ColumnCollectionChanged(object sender, CollectionChangeEventArgs e) { DataView dv = (DataView)_dvWeak.Target; if (dv != null) { dv.ColumnCollectionChangedInternal(sender, e); } else { CleanUp(true); } } /// /// Maintain the DataView before internal void MaintainDataView(ListChangedType changedType, DataRow row, bool trackAddRemove) { DataView dv = (DataView)_dvWeak.Target; if (dv != null) { dv.MaintainDataView(changedType, row, trackAddRemove); } else { CleanUp(true); } } internal void IndexListChanged(ListChangedEventArgs e) { DataView dv = (DataView)_dvWeak.Target; if (dv != null) { dv.IndexListChangedInternal(e); } else { CleanUp(true); } } internal void RegisterMetaDataEvents(DataTable table) { Debug.Assert(null == _table, "DataViewListener already registered table"); _table = table; if (table != null) { // actively remove listeners without a target RegisterListener(table); // start listening to events CollectionChangeEventHandler handlerCollection = new CollectionChangeEventHandler(ColumnCollectionChanged); table.Columns.ColumnPropertyChanged += handlerCollection; table.Columns.CollectionChanged += handlerCollection; CollectionChangeEventHandler handlerChildRelation = new CollectionChangeEventHandler(ChildRelationCollectionChanged); ((DataRelationCollection.DataTableRelationCollection)(table.ChildRelations)).RelationPropertyChanged += handlerChildRelation; table.ChildRelations.CollectionChanged += handlerChildRelation; CollectionChangeEventHandler handlerParentRelation = new CollectionChangeEventHandler(ParentRelationCollectionChanged); ((DataRelationCollection.DataTableRelationCollection)(table.ParentRelations)).RelationPropertyChanged += handlerParentRelation; table.ParentRelations.CollectionChanged += handlerParentRelation; } } internal void UnregisterMetaDataEvents() { UnregisterMetaDataEvents(true); } private void UnregisterMetaDataEvents(bool updateListeners) { DataTable table = _table; _table = null; if (table != null) { CollectionChangeEventHandler handlerCollection = new CollectionChangeEventHandler(ColumnCollectionChanged); table.Columns.ColumnPropertyChanged -= handlerCollection; table.Columns.CollectionChanged -= handlerCollection; CollectionChangeEventHandler handlerChildRelation = new CollectionChangeEventHandler(ChildRelationCollectionChanged); ((DataRelationCollection.DataTableRelationCollection)(table.ChildRelations)).RelationPropertyChanged -= handlerChildRelation; table.ChildRelations.CollectionChanged -= handlerChildRelation; CollectionChangeEventHandler handlerParentRelation = new CollectionChangeEventHandler(ParentRelationCollectionChanged); ((DataRelationCollection.DataTableRelationCollection)(table.ParentRelations)).RelationPropertyChanged -= handlerParentRelation; table.ParentRelations.CollectionChanged -= handlerParentRelation; if (updateListeners) { Listis raised. /// listeners = table.GetListeners(); lock (listeners) { listeners.Remove(this); } } } } internal void RegisterListChangedEvent(Index index) { Debug.Assert(null == _index, "DataviewListener already registered index"); _index = index; if (null != index) { lock (index) { index.AddRef(); index.ListChangedAdd(this); } } } internal void UnregisterListChangedEvent() { Index index = _index; _index = null; if (index != null) { lock (index) { index.ListChangedRemove(this); if (index.RemoveRef() <= 1) { index.RemoveRef(); } } } } private void CleanUp(bool updateListeners) { UnregisterMetaDataEvents(updateListeners); UnregisterListChangedEvent(); } private void RegisterListener(DataTable table) { List listeners = table.GetListeners(); lock (listeners) { for (int i = listeners.Count - 1; 0 <= i; --i) { DataViewListener listener = listeners[i]; if (!listener._dvWeak.IsAlive) { listeners.RemoveAt(i); listener.CleanUp(false); } } listeners.Add(this); } } } } // 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
- NullReferenceException.cs
- PnrpPermission.cs
- TreeNodeCollection.cs
- XmlDesigner.cs
- AsymmetricCryptoHandle.cs
- RowUpdatedEventArgs.cs
- RuntimeWrappedException.cs
- Assembly.cs
- AssociationEndMember.cs
- WebServiceHostFactory.cs
- DataGridViewUtilities.cs
- CodeTypeReference.cs
- DefaultValueAttribute.cs
- PersonalizationProviderCollection.cs
- OdbcStatementHandle.cs
- ValidationRuleCollection.cs
- DBBindings.cs
- ArraySet.cs
- UdpReplyToBehavior.cs
- PersonalizationStateQuery.cs
- Event.cs
- OdbcException.cs
- TripleDESCryptoServiceProvider.cs
- Base64Decoder.cs
- _NegoState.cs
- HttpHandlerActionCollection.cs
- Delegate.cs
- DbParameterHelper.cs
- DataTableClearEvent.cs
- EventLogPermissionEntry.cs
- DESCryptoServiceProvider.cs
- HtmlTable.cs
- WebHttpSecurity.cs
- CryptoStream.cs
- RequestReplyCorrelator.cs
- WindowsGraphicsCacheManager.cs
- TypedTableHandler.cs
- ComplexTypeEmitter.cs
- PointF.cs
- ExpressionLink.cs
- RuleSetReference.cs
- glyphs.cs
- StylusPlugInCollection.cs
- ToolStripDesigner.cs
- TemplateManager.cs
- LocationUpdates.cs
- ConversionValidationRule.cs
- ClientRolePrincipal.cs
- BasePattern.cs
- DependsOnAttribute.cs
- ExpressionValueEditor.cs
- OracleBoolean.cs
- SQLCharsStorage.cs
- DockAndAnchorLayout.cs
- StrokeNodeData.cs
- MdiWindowListStrip.cs
- ObfuscationAttribute.cs
- HtmlMeta.cs
- QueryStringParameter.cs
- Transform3DCollection.cs
- MessagePropertyDescription.cs
- PassportPrincipal.cs
- SynchronizingStream.cs
- RuntimeHelpers.cs
- Filter.cs
- VarInfo.cs
- ChildTable.cs
- CurrentChangingEventManager.cs
- HexParser.cs
- EnvironmentPermission.cs
- TargetInvocationException.cs
- mansign.cs
- ButtonColumn.cs
- RelationshipConverter.cs
- RSACryptoServiceProvider.cs
- CodeGenerator.cs
- isolationinterop.cs
- ReturnType.cs
- TextProperties.cs
- SettingsSavedEventArgs.cs
- TextElementCollection.cs
- PenContexts.cs
- XmlDataProvider.cs
- UxThemeWrapper.cs
- MemoryPressure.cs
- PenLineCapValidation.cs
- EntityDataSourceMemberPath.cs
- ComponentChangedEvent.cs
- CounterSample.cs
- DynamicEndpoint.cs
- TextCompositionManager.cs
- WebHeaderCollection.cs
- AsymmetricKeyExchangeFormatter.cs
- OciLobLocator.cs
- ModelTreeEnumerator.cs
- MemberNameValidator.cs
- DataGridItem.cs
- Command.cs
- ContentHostHelper.cs
- SamlDoNotCacheCondition.cs