Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / httpapplicationstate.cs / 1 / httpapplicationstate.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * Application State Dictionary class * * Copyright (c) 1999 Microsoft Corporation */ namespace System.Web { using System.Threading; using System.Runtime.InteropServices; using System.Security.Permissions; using System.Collections; using System.Collections.Specialized; using System.Web; using System.Web.Util; // // Application state collection // ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class HttpApplicationState : NameObjectCollectionBase { // app lock with auto-unlock feature private HttpApplicationStateLock _lock = new HttpApplicationStateLock(); // static object collections private HttpStaticObjectsCollection _applicationStaticObjects; private HttpStaticObjectsCollection _sessionStaticObjects; internal HttpApplicationState() : this(null, null) { } internal HttpApplicationState(HttpStaticObjectsCollection applicationStaticObjects, HttpStaticObjectsCollection sessionStaticObjects) : base(Misc.CaseInsensitiveInvariantKeyComparer) { _applicationStaticObjects = applicationStaticObjects; if (_applicationStaticObjects == null) _applicationStaticObjects = new HttpStaticObjectsCollection(); _sessionStaticObjects = sessionStaticObjects; if (_sessionStaticObjects == null) _sessionStaticObjects = new HttpStaticObjectsCollection(); } // // Internal accessor to session static objects collection // internal HttpStaticObjectsCollection SessionStaticObjects { get { return _sessionStaticObjects;} } // // Implementation of standard collection stuff // ////// The HttpApplicationState class enables developers to /// share global information across multiple requests, sessions, and pipelines /// within an ASP.NET application. (An ASP.NET application is the sum of all files, pages, /// handlers, modules, and code /// within the scope of a virtual directory and its /// subdirectories on a single web server). /// ////// public override int Count { get { int c = 0; _lock.AcquireRead(); try { c = base.Count; } finally { _lock.ReleaseRead(); } return c; } } // modifying methods ///Gets /// the number of item objects in the application state collection. ////// public void Add(String name, Object value) { _lock.AcquireWrite(); try { BaseAdd(name, value); } finally { _lock.ReleaseWrite(); } } ////// Adds /// a new state object to the application state collection. /// ////// public void Set(String name, Object value) { _lock.AcquireWrite(); try { BaseSet(name, value); } finally { _lock.ReleaseWrite(); } } ///Updates an HttpApplicationState value within the collection. ////// public void Remove(String name) { _lock.AcquireWrite(); try { BaseRemove(name); } finally { _lock.ReleaseWrite(); } } ///Removes /// an /// object from the application state collection by name. ////// public void RemoveAt(int index) { _lock.AcquireWrite(); try { BaseRemoveAt(index); } finally { _lock.ReleaseWrite(); } } ///Removes /// an /// object from the application state collection by name. ////// public void Clear() { _lock.AcquireWrite(); try { BaseClear(); } finally { _lock.ReleaseWrite(); } } ////// Removes /// all objects from the application state collection. /// ////// public void RemoveAll() { Clear(); } // access by key ////// Removes /// all objects from the application state collection. /// ////// public Object Get(String name) { Object obj = null; _lock.AcquireRead(); try { obj = BaseGet(name); } finally { _lock.ReleaseRead(); } return obj; } ////// Enables user to retrieve application state object by name. /// ////// public Object this[String name] { get { return Get(name);} set { Set(name, value);} } // access by index ///Enables /// a user to add/remove/update a single application state object. ////// public Object Get(int index) { Object obj = null; _lock.AcquireRead(); try { obj = BaseGet(index); } finally { _lock.ReleaseRead(); } return obj; } ////// Enables user /// to retrieve a single application state object by index. /// ////// public String GetKey(int index) { String s = null; _lock.AcquireRead(); try { s = BaseGetKey(index); } finally { _lock.ReleaseRead(); } return s; } ////// Enables user to retrieve an application state object name by index. /// ////// public Object this[int index] { get { return Get(index);} } // access to keys and values as arrays ////// Enables /// user to retrieve an application state object by index. /// ////// public String[] AllKeys { get { String [] allKeys = null; _lock.AcquireRead(); try { allKeys = BaseGetAllKeys(); } finally { _lock.ReleaseRead(); } return allKeys; } } // // Public properties // ////// Enables user /// to retrieve all application state object names in collection. /// ////// public HttpApplicationState Contents { get { return this;} } ////// Returns "this". Provided for legacy ASP compatibility. /// ////// public HttpStaticObjectsCollection StaticObjects { get { return _applicationStaticObjects;} } // // Locking support // ////// Exposes all objects declared via an <object /// runat=server></object> tag within the ASP.NET application file. /// ////// public void Lock() { _lock.AcquireWrite(); } ////// Locks /// access to all application state variables. Facilitates access /// synchronization. /// ////// public void UnLock() { _lock.ReleaseWrite(); } internal void EnsureUnLock() { _lock.EnsureReleaseWrite(); } } // // Recursive read-write lock that allows removing of all // outstanding write locks from the current thread at once // internal class HttpApplicationStateLock : ReadWriteObjectLock { private int _recursionCount; private int _threadId; internal HttpApplicationStateLock() { } internal override void AcquireRead() { int currentThreadId = SafeNativeMethods.GetCurrentThreadId(); if (_threadId != currentThreadId) base.AcquireRead(); // only if no write lock } internal override void ReleaseRead() { int currentThreadId = SafeNativeMethods.GetCurrentThreadId(); if (_threadId != currentThreadId) base.ReleaseRead(); // only if no write lock } internal override void AcquireWrite() { int currentThreadId = SafeNativeMethods.GetCurrentThreadId(); if (_threadId == currentThreadId) { _recursionCount++; } else { base.AcquireWrite(); _threadId = currentThreadId; _recursionCount = 1; } } internal override void ReleaseWrite() { int currentThreadId = SafeNativeMethods.GetCurrentThreadId(); if (_threadId == currentThreadId) { if (--_recursionCount == 0) { _threadId = 0; base.ReleaseWrite(); } } } // // release all write locks held by the current thread // internal void EnsureReleaseWrite() { int currentThreadId = SafeNativeMethods.GetCurrentThreadId(); if (_threadId == currentThreadId) { _threadId = 0; _recursionCount = 0; base.ReleaseWrite(); } } } }/// Unocks access to all application state variables. Facilitates access /// synchronization. /// ///
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SecurityTokenTypes.cs
- Hyperlink.cs
- BitmapEffectDrawingContent.cs
- KoreanLunisolarCalendar.cs
- ProcessProtocolHandler.cs
- ItemCheckEvent.cs
- NetTcpSection.cs
- AuthenticationConfig.cs
- SerializerProvider.cs
- BlockExpression.cs
- SqlPersonalizationProvider.cs
- TypedTableBaseExtensions.cs
- EndOfStreamException.cs
- RenderDataDrawingContext.cs
- AddInProcess.cs
- ExceptionList.cs
- DbConnectionStringBuilder.cs
- XmlAggregates.cs
- PersianCalendar.cs
- XamlFrame.cs
- WebExceptionStatus.cs
- DoubleConverter.cs
- AccessibilityApplicationManager.cs
- Action.cs
- DSASignatureDeformatter.cs
- TreeViewHitTestInfo.cs
- DataPagerFieldItem.cs
- DirectoryLocalQuery.cs
- ValidatorCollection.cs
- PriorityChain.cs
- BulletedListEventArgs.cs
- ReturnEventArgs.cs
- MD5.cs
- EdmValidator.cs
- XamlFigureLengthSerializer.cs
- localization.cs
- SrgsElementFactoryCompiler.cs
- XmlEventCache.cs
- StateFinalizationActivity.cs
- DataTableCollection.cs
- StrongNameUtility.cs
- ConfigurationConverterBase.cs
- SmtpSpecifiedPickupDirectoryElement.cs
- TypefaceMap.cs
- InkCanvasSelection.cs
- DataSourceListEditor.cs
- ProfilePropertyMetadata.cs
- PageClientProxyGenerator.cs
- ActiveDocumentEvent.cs
- SrgsElementList.cs
- ByeMessageApril2005.cs
- ResourceAttributes.cs
- ScriptingSectionGroup.cs
- IssuanceLicense.cs
- PropertyGrid.cs
- DataTableExtensions.cs
- ImageAutomationPeer.cs
- FixedTextView.cs
- JsonSerializer.cs
- ConnectionPoint.cs
- Panel.cs
- UpdateCommandGenerator.cs
- UrlPath.cs
- PointAnimationUsingKeyFrames.cs
- CodeAccessSecurityEngine.cs
- DecoderReplacementFallback.cs
- FrameDimension.cs
- UserPersonalizationStateInfo.cs
- DoubleCollectionConverter.cs
- MappedMetaModel.cs
- FacetEnabledSchemaElement.cs
- FrameworkContentElement.cs
- DateTimeOffset.cs
- TimelineGroup.cs
- TextRangeSerialization.cs
- IPGlobalProperties.cs
- MethodAccessException.cs
- ObjectAnimationUsingKeyFrames.cs
- ResourceLoader.cs
- ConnectionsZone.cs
- CompiledRegexRunnerFactory.cs
- NotifyIcon.cs
- mansign.cs
- Unit.cs
- LayoutSettings.cs
- FormsAuthenticationCredentials.cs
- File.cs
- ConfigPathUtility.cs
- CompositionCommandSet.cs
- XamlFilter.cs
- IpcClientChannel.cs
- SurrogateChar.cs
- ProxyWebPartConnectionCollection.cs
- Parallel.cs
- DataAccessor.cs
- Exceptions.cs
- ServicePointManagerElement.cs
- BuildManager.cs
- SafeNativeMethods.cs
- MemoryStream.cs