Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Data / System / Data / DataViewListener.cs / 5 / 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. //------------------------------------------------------------------------------ // // 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
- TypeGeneratedEventArgs.cs
- PerfCounterSection.cs
- StylusTip.cs
- CompressEmulationStream.cs
- XPathChildIterator.cs
- ObjectStorage.cs
- OrderedEnumerableRowCollection.cs
- CollectionChangedEventManager.cs
- PageBreakRecord.cs
- WsatTransactionHeader.cs
- ExceptionDetail.cs
- oledbmetadatacollectionnames.cs
- PolicyManager.cs
- ControlAdapter.cs
- SoapExtensionStream.cs
- InstallerTypeAttribute.cs
- Semaphore.cs
- LifetimeServices.cs
- DynamicControl.cs
- PrintDialogException.cs
- BinaryFormatterWriter.cs
- Sequence.cs
- Transform.cs
- LocalizationComments.cs
- DataRelationPropertyDescriptor.cs
- SubclassTypeValidatorAttribute.cs
- StringOutput.cs
- KeyInfo.cs
- BooleanConverter.cs
- XhtmlBasicCommandAdapter.cs
- FileAuthorizationModule.cs
- DependencyPropertyValueSerializer.cs
- _SslSessionsCache.cs
- WCFModelStrings.Designer.cs
- FtpWebResponse.cs
- BmpBitmapDecoder.cs
- HttpDebugHandler.cs
- RelationshipConverter.cs
- StrokeDescriptor.cs
- VisualBasicSettings.cs
- CustomSignedXml.cs
- MethodBuilder.cs
- FileIOPermission.cs
- Set.cs
- EtwProvider.cs
- AuthenticateEventArgs.cs
- XmlNotation.cs
- SqlTopReducer.cs
- ParameterBinding.cs
- DelegatingTypeDescriptionProvider.cs
- Int32KeyFrameCollection.cs
- ToolStripSettings.cs
- CodeAccessPermission.cs
- DataColumnCollection.cs
- CallContext.cs
- ActivityCodeDomReferenceService.cs
- FamilyMap.cs
- HttpModule.cs
- ToolStripManager.cs
- HtmlTableRowCollection.cs
- RequestCacheValidator.cs
- OdbcReferenceCollection.cs
- BinaryObjectWriter.cs
- KeyFrames.cs
- PaperSize.cs
- PropertyPathConverter.cs
- TextEffectCollection.cs
- ToolStripGrip.cs
- DataGridRelationshipRow.cs
- AggregateNode.cs
- SmtpSection.cs
- ConfigurationElementCollection.cs
- SamlAssertionKeyIdentifierClause.cs
- Stack.cs
- InvokePatternIdentifiers.cs
- DataGridViewRowContextMenuStripNeededEventArgs.cs
- EmissiveMaterial.cs
- Int16Converter.cs
- Rfc4050KeyFormatter.cs
- FontFamilyIdentifier.cs
- DomNameTable.cs
- EntityViewGenerationAttribute.cs
- TextProviderWrapper.cs
- GroupItemAutomationPeer.cs
- CollectionChangeEventArgs.cs
- WebBodyFormatMessageProperty.cs
- TraceSwitch.cs
- RawStylusActions.cs
- EdmValidator.cs
- RealProxy.cs
- ProjectionCamera.cs
- AsyncOperation.cs
- EntityViewGenerationAttribute.cs
- FixedSchema.cs
- WizardPanel.cs
- TableChangeProcessor.cs
- Hash.cs
- ScrollChangedEventArgs.cs
- ToolboxBitmapAttribute.cs
- Rect3D.cs