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
- ListContractAdapter.cs
- ExpressionVisitor.cs
- SecurityException.cs
- Bitmap.cs
- AttributedMetaModel.cs
- SqlConnectionStringBuilder.cs
- XsdDateTime.cs
- XpsResourceDictionary.cs
- StringDictionaryWithComparer.cs
- SqlDataReader.cs
- WebUtility.cs
- WebServiceHandlerFactory.cs
- FixedHyperLink.cs
- ListCollectionView.cs
- MsmqDecodeHelper.cs
- BindingSourceDesigner.cs
- QilGeneratorEnv.cs
- DesignerImageAdapter.cs
- GeometryConverter.cs
- EmptyEnumerator.cs
- CatalogPartChrome.cs
- PersianCalendar.cs
- TriggerActionCollection.cs
- FragmentQuery.cs
- EntityContainerEntitySet.cs
- TreeNodeMouseHoverEvent.cs
- Point3DValueSerializer.cs
- ButtonChrome.cs
- Authorization.cs
- CategoryAttribute.cs
- FacetDescriptionElement.cs
- Buffer.cs
- CompilerError.cs
- Propagator.ExtentPlaceholderCreator.cs
- COM2ExtendedTypeConverter.cs
- IssuanceLicense.cs
- DefaultValueTypeConverter.cs
- SubstitutionDesigner.cs
- AutomationEvent.cs
- PageAdapter.cs
- WebPartMinimizeVerb.cs
- MSG.cs
- PathData.cs
- XmlSchemaAppInfo.cs
- StylusShape.cs
- CompilationSection.cs
- BaseProcessor.cs
- Point3DCollection.cs
- BindingMAnagerBase.cs
- DrawingContext.cs
- OdbcParameterCollection.cs
- PreloadedPackages.cs
- RegexMatch.cs
- StrongNameUtility.cs
- ClientSession.cs
- ConnectionModeReader.cs
- Char.cs
- _NetRes.cs
- SoapDocumentServiceAttribute.cs
- RoutedEvent.cs
- ValidatorAttribute.cs
- SafeLibraryHandle.cs
- BmpBitmapDecoder.cs
- LineProperties.cs
- BadImageFormatException.cs
- xamlnodes.cs
- OperatingSystemVersionCheck.cs
- ConstructorArgumentAttribute.cs
- CodeTypeDelegate.cs
- TextTreeFixupNode.cs
- EncryptedPackage.cs
- ServerIdentity.cs
- SmtpDigestAuthenticationModule.cs
- LocalIdKeyIdentifierClause.cs
- FlagsAttribute.cs
- DataServiceQueryException.cs
- BitmapDownload.cs
- MruCache.cs
- HierarchicalDataTemplate.cs
- OutputCacheProfile.cs
- MILUtilities.cs
- WebPartEditorOkVerb.cs
- ResourceManager.cs
- CompositionCommandSet.cs
- Function.cs
- Literal.cs
- CacheVirtualItemsEvent.cs
- SoapMessage.cs
- WebReferencesBuildProvider.cs
- TreeViewDesigner.cs
- OdbcRowUpdatingEvent.cs
- ImageSource.cs
- SoapHttpTransportImporter.cs
- CacheMemory.cs
- Ops.cs
- EventNotify.cs
- RootProfilePropertySettingsCollection.cs
- SpnegoTokenProvider.cs
- HttpListenerRequestUriBuilder.cs
- Point.cs