Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / Collections / ObjectModel / WeakReadOnlyCollection.cs / 1305600 / WeakReadOnlyCollection.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // This is basically copied from ReadOnlyCollection, with just enough modification // to support storage of items as WeakReferences. Use of internal BCL features // is commented out. // Most of the O(N) operations - Contains, IndexOf, etc. - // are implemented by simply exploding the base list into a List . This isn't // particularly efficient, but we don't expect to use these methods very often. // The important scenario is one where we need WR not because we expect the targets // to die (we don't), but because we need to avoid creating cycles containing the // WeakReadOnlyCollection. Thus we don't check for WR.Target==null. namespace System.Collections.ObjectModel { using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Windows; using MS.Internal.WindowsBase; // [FriendAccessAllowed] [Serializable] [System.Runtime.InteropServices.ComVisible(false)] //[DebuggerTypeProxy(typeof(Mscorlib_CollectionDebugView<>))] [DebuggerDisplay("Count = {Count}")] [FriendAccessAllowed] internal class WeakReadOnlyCollection : IList , IList { //IList list; IList list; [NonSerialized] private Object _syncRoot; public WeakReadOnlyCollection(IList list) { // assumption: the WRs in list refer to T's if (list == null) { throw new ArgumentNullException("list"); } this.list = list; } public int Count { get { return list.Count; } } public T this[int index] { //get { return list[index]; } get { return (T)list[index].Target; } } public bool Contains(T value) { //return list.Contains(value); return CreateDereferencedList().Contains(value); } public void CopyTo(T[] array, int index) { //list.CopyTo(array, index); CreateDereferencedList().CopyTo(array, index); } public IEnumerator GetEnumerator() { //return list.GetEnumerator(); return new WeakEnumerator(list.GetEnumerator()); } public int IndexOf(T value) { //return list.IndexOf(value); return CreateDereferencedList().IndexOf(value); } /* protected IList Items { get { return list; } } */ bool ICollection .IsReadOnly { get { return true; } } T IList .this[int index] { //get { return list[index]; } get { return (T)list[index].Target; } set { //ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); throw new NotSupportedException(SR.Get(SRID.NotSupported_ReadOnlyCollection)); } } void ICollection .Add(T value) { //ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); throw new NotSupportedException(SR.Get(SRID.NotSupported_ReadOnlyCollection)); } void ICollection .Clear() { //ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); throw new NotSupportedException(SR.Get(SRID.NotSupported_ReadOnlyCollection)); } void IList .Insert(int index, T value) { //ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); throw new NotSupportedException(SR.Get(SRID.NotSupported_ReadOnlyCollection)); } bool ICollection .Remove(T value) { //ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); throw new NotSupportedException(SR.Get(SRID.NotSupported_ReadOnlyCollection)); //return false; } void IList .RemoveAt(int index) { //ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); throw new NotSupportedException(SR.Get(SRID.NotSupported_ReadOnlyCollection)); } IEnumerator IEnumerable.GetEnumerator() { //return ((IEnumerable)list).GetEnumerator(); return new WeakEnumerator(((IEnumerable)list).GetEnumerator()); } bool ICollection.IsSynchronized { get { return false; } } object ICollection.SyncRoot { get { if( _syncRoot == null) { ICollection c = list as ICollection; if( c != null) { _syncRoot = c.SyncRoot; } else { System.Threading.Interlocked.CompareExchange
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ShaderEffect.cs
- XmlStreamStore.cs
- XmlNamedNodeMap.cs
- PointLight.cs
- TemplateBindingExpression.cs
- ViewPort3D.cs
- AxHost.cs
- CompressStream.cs
- XmlDocumentSerializer.cs
- SynchronizedDispatch.cs
- XLinq.cs
- HashAlgorithm.cs
- DataGridViewTextBoxColumn.cs
- SqlVersion.cs
- MetafileHeaderWmf.cs
- CLSCompliantAttribute.cs
- SkewTransform.cs
- InkCanvasInnerCanvas.cs
- CreateUserWizard.cs
- Rect3D.cs
- MetafileHeaderWmf.cs
- IssuedTokenParametersElement.cs
- initElementDictionary.cs
- SoapSchemaExporter.cs
- CellQuery.cs
- PropertyStore.cs
- DBConnectionString.cs
- KnownBoxes.cs
- assemblycache.cs
- TemplateAction.cs
- SafeSystemMetrics.cs
- PropertyNames.cs
- AllMembershipCondition.cs
- SkewTransform.cs
- ToolboxComponentsCreatedEventArgs.cs
- AppDomainShutdownMonitor.cs
- ErrorWrapper.cs
- ApplicationInfo.cs
- comcontractssection.cs
- SystemFonts.cs
- FontWeight.cs
- Rect3DValueSerializer.cs
- TextContainerChangeEventArgs.cs
- EntitySqlQueryCacheEntry.cs
- NetSectionGroup.cs
- XmlWhitespace.cs
- CodeExpressionCollection.cs
- Compiler.cs
- SynchronizationFilter.cs
- TemplateInstanceAttribute.cs
- GlyphCache.cs
- OptimisticConcurrencyException.cs
- BaseHashHelper.cs
- IResourceProvider.cs
- PolyLineSegment.cs
- ProfileParameter.cs
- EncoderBestFitFallback.cs
- DataGridViewButtonCell.cs
- SqlCachedBuffer.cs
- ProcessHostConfigUtils.cs
- MultipartIdentifier.cs
- ClientTargetCollection.cs
- CompatibleComparer.cs
- SqlDataReaderSmi.cs
- XmlSerializableReader.cs
- SymmetricAlgorithm.cs
- ValueConversionAttribute.cs
- AssertFilter.cs
- CompositeFontFamily.cs
- ParameterCollection.cs
- ObjectSet.cs
- HeaderUtility.cs
- ParserExtension.cs
- PropertiesTab.cs
- KnownBoxes.cs
- DataPagerField.cs
- ProxyGenerator.cs
- SemanticAnalyzer.cs
- PerSessionInstanceContextProvider.cs
- formatstringdialog.cs
- MsmqIntegrationSecurityMode.cs
- NodeInfo.cs
- ToolStripManager.cs
- PerspectiveCamera.cs
- EventProviderTraceListener.cs
- TabControl.cs
- PreviousTrackingServiceAttribute.cs
- FixedSOMTextRun.cs
- JsonUriDataContract.cs
- Byte.cs
- XPathNode.cs
- Size.cs
- StringResourceManager.cs
- OpCodes.cs
- DesignSurfaceServiceContainer.cs
- PageRequestManager.cs
- Normalization.cs
- DockingAttribute.cs
- DecimalMinMaxAggregationOperator.cs
- InkSerializer.cs