Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / httpapplicationstate.cs / 1305376 / 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 // ////// 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(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007./// 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
- MappingMetadataHelper.cs
- ByteKeyFrameCollection.cs
- Pair.cs
- ValueExpressions.cs
- PropertyItemInternal.cs
- OdbcHandle.cs
- DataRowView.cs
- ObjectPersistData.cs
- TypedCompletedAsyncResult.cs
- HostingEnvironment.cs
- BuiltInExpr.cs
- ProxyHelper.cs
- AnnotationResourceChangedEventArgs.cs
- PolicyChain.cs
- StreamInfo.cs
- PriorityQueue.cs
- sqlmetadatafactory.cs
- GraphicsState.cs
- ParenthesizePropertyNameAttribute.cs
- ValueOfAction.cs
- Crc32Helper.cs
- FlowDocumentPaginator.cs
- HttpListenerPrefixCollection.cs
- SimpleBitVector32.cs
- OperationFormatter.cs
- BatchWriter.cs
- NetTcpSecurityElement.cs
- HtmlImageAdapter.cs
- Confirm.cs
- SoapExtensionTypeElement.cs
- BitStack.cs
- JulianCalendar.cs
- SynchronizedInputProviderWrapper.cs
- MetadataArtifactLoaderXmlReaderWrapper.cs
- OdbcHandle.cs
- UniqueIdentifierService.cs
- BrowserTree.cs
- UserUseLicenseDictionaryLoader.cs
- SoapObjectWriter.cs
- SHA1Cng.cs
- SafeUserTokenHandle.cs
- Point3DAnimationBase.cs
- BaseTemplateBuildProvider.cs
- BlockingCollection.cs
- ModelChangedEventArgsImpl.cs
- SemanticAnalyzer.cs
- SystemException.cs
- IsolatedStorageFileStream.cs
- ProcessRequestArgs.cs
- HandleRef.cs
- ItemsControlAutomationPeer.cs
- ConstructorArgumentAttribute.cs
- CodeDomSerializationProvider.cs
- OutputCacheSettingsSection.cs
- PlanCompiler.cs
- VerticalAlignConverter.cs
- InputReferenceExpression.cs
- ColumnClickEvent.cs
- Matrix3D.cs
- SettingsPropertyValue.cs
- KoreanCalendar.cs
- SettingsProviderCollection.cs
- newinstructionaction.cs
- RootBrowserWindow.cs
- TransactionState.cs
- ProviderIncompatibleException.cs
- CursorInteropHelper.cs
- BooleanFunctions.cs
- DataRelation.cs
- OneToOneMappingSerializer.cs
- PanelStyle.cs
- infer.cs
- FixedSOMElement.cs
- StateRuntime.cs
- FixedPosition.cs
- RegistryKey.cs
- DeleteHelper.cs
- DataGridViewCellConverter.cs
- SafeLibraryHandle.cs
- WebResourceUtil.cs
- Fx.cs
- DbConnectionOptions.cs
- X509Chain.cs
- Rect3DConverter.cs
- TileModeValidation.cs
- TextRunCache.cs
- NameTable.cs
- DynamicRenderer.cs
- PointCollection.cs
- Page.cs
- UnhandledExceptionEventArgs.cs
- activationcontext.cs
- StrokeNodeData.cs
- XmlSchemaSimpleContent.cs
- x509utils.cs
- CaseInsensitiveOrdinalStringComparer.cs
- SystemUnicastIPAddressInformation.cs
- ToolboxService.cs
- SessionStateModule.cs
- ButtonColumn.cs