Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / TraceLevelStore.cs / 1305600 / TraceLevelStore.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Storage for the "TraceLevel" attached property. // //--------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Diagnostics; namespace MS.Internal { ////// This class stores values for the attached property /// PresentationTraceSources.TraceLevel. /// internal static class TraceLevelStore { #region Constructors // // Constructors // #endregion Constructors #region Internal Methods // // Internal Methods // ////// Reads the attached property TraceLevel from the given element. /// internal static PresentationTraceLevel GetTraceLevel(object element) { PresentationTraceLevel result; if (element == null || _dictionary.Count == 0) { result = PresentationTraceLevel.None; } else { lock (_dictionary) { Key key = new Key(element); if (!_dictionary.TryGetValue(key, out result)) { result = PresentationTraceLevel.None; } } } return result; } ////// Writes the attached property TraceLevel to the given element. /// internal static void SetTraceLevel(object element, PresentationTraceLevel traceLevel) { if (element == null) return; lock (_dictionary) { Key key = new Key(element, true); if (traceLevel > PresentationTraceLevel.None) { _dictionary[key] = traceLevel; } else { _dictionary.Remove(key); } } } #endregion Internal Methods #region Private Fields // // Private Fields // private static Dictionary_dictionary = new Dictionary (); #endregion Private Fields #region Table Keys // the key for the dictionary: <((element)), hashcode> private struct Key { internal Key(object element, bool useWeakRef) { _element = new WeakReference(element); _hashcode = element.GetHashCode(); } internal Key(object element) { _element = element; _hashcode = element.GetHashCode(); } public override int GetHashCode() { #if DEBUG WeakReference wr = _element as WeakReference; object element = (wr != null) ? wr.Target : _element; if (element != null) { int hashcode = element.GetHashCode(); Debug.Assert(hashcode == _hashcode, "hashcodes disagree"); } #endif return _hashcode; } public override bool Equals(object o) { if (o is Key) { WeakReference wr; Key that = (Key)o; if (this._hashcode != that._hashcode) return false; wr = this._element as WeakReference; object s1 = (wr != null) ? wr.Target : this._element; wr = that._element as WeakReference; object s2 = (wr != null) ? wr.Target : that._element; if (s1!=null && s2!=null) return (s1 == s2); else return (this._element == that._element); } else { return false; } } public static bool operator==(Key key1, Key key2) { return key1.Equals(key2); } public static bool operator!=(Key key1, Key key2) { return !key1.Equals(key2); } object _element; // lookup: direct ref. In table: WeakRef int _hashcode; // cached, in case source is GC'd } #endregion Table Keys } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- TakeQueryOptionExpression.cs
- AmbiguousMatchException.cs
- ClrPerspective.cs
- CodePropertyReferenceExpression.cs
- DynamicValueConverter.cs
- XmlLoader.cs
- Normalizer.cs
- ResourceType.cs
- _LocalDataStore.cs
- ArrayListCollectionBase.cs
- SafeEventLogWriteHandle.cs
- BinaryCommonClasses.cs
- TreeViewImageKeyConverter.cs
- SimpleFieldTemplateFactory.cs
- StrokeNodeOperations2.cs
- MexHttpBindingElement.cs
- DateTimeFormat.cs
- ManipulationLogic.cs
- ClickablePoint.cs
- SerialErrors.cs
- DecoratedNameAttribute.cs
- LogLogRecord.cs
- SaveWorkflowAsyncResult.cs
- MarshalByRefObject.cs
- EtwTrace.cs
- ScheduleChanges.cs
- SerializerWriterEventHandlers.cs
- ObservableDictionary.cs
- DocumentsTrace.cs
- ResourceProviderFactory.cs
- StorageAssociationTypeMapping.cs
- InlinedLocationReference.cs
- If.cs
- ObjectCache.cs
- LayoutEngine.cs
- IDQuery.cs
- TextServicesDisplayAttribute.cs
- DynamicExpression.cs
- OdbcHandle.cs
- XmlSchemaInferenceException.cs
- PageRanges.cs
- ContextDataSource.cs
- ITextView.cs
- TextEndOfParagraph.cs
- SymDocumentType.cs
- StreamGeometry.cs
- Line.cs
- AnnotationService.cs
- DispatchWrapper.cs
- LinqDataSourceDeleteEventArgs.cs
- ObjectDataSourceFilteringEventArgs.cs
- TabControl.cs
- SqlUDTStorage.cs
- LayoutDump.cs
- EntityDataSourceSelectingEventArgs.cs
- TypeBuilderInstantiation.cs
- GridEntryCollection.cs
- GPPOINT.cs
- CompilerResults.cs
- ToolBarButtonClickEvent.cs
- SafeTimerHandle.cs
- HealthMonitoringSection.cs
- DataControlFieldCell.cs
- ProtocolsSection.cs
- FormsAuthenticationTicket.cs
- ContextMarshalException.cs
- JsonServiceDocumentSerializer.cs
- LinearGradientBrush.cs
- SmiXetterAccessMap.cs
- LinearKeyFrames.cs
- UshortList2.cs
- ContainerActivationHelper.cs
- DynamicEndpointElement.cs
- GZipDecoder.cs
- TimeIntervalCollection.cs
- ViewBase.cs
- Attributes.cs
- XmlSecureResolver.cs
- PromptStyle.cs
- DataGridViewComboBoxEditingControl.cs
- XmlAnyElementAttribute.cs
- GridViewCancelEditEventArgs.cs
- ICspAsymmetricAlgorithm.cs
- WebPartConnectionsDisconnectVerb.cs
- AsyncStreamReader.cs
- DataTableCollection.cs
- Label.cs
- TextDecorationCollection.cs
- ErrorFormatterPage.cs
- TextEditorCharacters.cs
- RowUpdatingEventArgs.cs
- Function.cs
- WebPartTransformer.cs
- WeakReferenceKey.cs
- TextElementEnumerator.cs
- PrimitiveXmlSerializers.cs
- EffectiveValueEntry.cs
- PassportAuthenticationModule.cs
- Crc32.cs
- FixedPageStructure.cs