Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / xsp / System / Web / UI / DataSourceCache.cs / 1 / DataSourceCache.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System.ComponentModel; using System.Web.Caching; using System.Web.Util; internal class DataSourceCache : IStateManager { public const int Infinite = 0; private bool _tracking; private StateBag _viewState; ////// The duration, in seconds, of the expiration. The expiration policy is specified by the ExpirationPolicy property. /// public virtual int Duration { get { object o = ViewState["Duration"]; if (o != null) return (int)o; return Infinite; } set { if (value < 0) { throw new ArgumentOutOfRangeException("value", SR.GetString(SR.DataSourceCache_InvalidDuration)); } ViewState["Duration"] = value; } } ////// Whether caching is enabled for this data source. /// public virtual bool Enabled { get { object o = ViewState["Enabled"]; if (o != null) return (bool)o; return false; } set { ViewState["Enabled"] = value; } } ////// The expiration policy of the cache. The duration for the expiration is specified by the Duration property. /// public virtual DataSourceCacheExpiry ExpirationPolicy { get { object o = ViewState["ExpirationPolicy"]; if (o != null) return (DataSourceCacheExpiry)o; return DataSourceCacheExpiry.Absolute; } set { if (value < DataSourceCacheExpiry.Absolute || value > DataSourceCacheExpiry.Sliding) { throw new ArgumentOutOfRangeException(SR.GetString(SR.DataSourceCache_InvalidExpiryPolicy)); } ViewState["ExpirationPolicy"] = value; } } ////// Indicates an arbitrary cache key to make this cache entry depend on. This allows /// the user to further customize when this cache entry will expire. /// [ DefaultValue(""), NotifyParentProperty(true), WebSysDescription(SR.DataSourceCache_KeyDependency), ] public virtual string KeyDependency { get { object o = ViewState["KeyDependency"]; if (o != null) return (string)o; return String.Empty; } set { ViewState["KeyDependency"] = value; } } ////// Indicates a dictionary of state information that allows you to save and restore /// the state of an object across multiple requests for the same page. /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] protected StateBag ViewState { get { if (_viewState == null) { _viewState = new StateBag(); if (_tracking) _viewState.TrackViewState(); } return _viewState; } } ////// Invalidates an ASP.NET cache entry using the specified key. /// SECURITY: This method should never accept user-defined inputs /// because it invalidates the internal ASP.net cache. /// public void Invalidate(string key) { if (String.IsNullOrEmpty(key)) { throw new ArgumentNullException("key"); } Debug.Assert(key.StartsWith(CacheInternal.PrefixDataSourceControl, StringComparison.Ordinal), "All keys passed in should start with the prefix specified in CacheInternal.PrefixDataSourceControl."); if (!Enabled) { throw new InvalidOperationException(SR.GetString(SR.DataSourceCache_CacheMustBeEnabled)); } HttpRuntime.CacheInternal.Remove(key); } ////// Loads data from the ASP.NET cache using the specified key. /// public object LoadDataFromCache(string key) { if (String.IsNullOrEmpty(key)) { throw new ArgumentNullException("key"); } Debug.Assert(key.StartsWith(CacheInternal.PrefixDataSourceControl, StringComparison.Ordinal), "All keys passed in should start with the prefix specified in CacheInternal.PrefixDataSourceControl."); if (!Enabled) { throw new InvalidOperationException(SR.GetString(SR.DataSourceCache_CacheMustBeEnabled)); } return HttpRuntime.CacheInternal.Get(key); } ////// Loads the state of the DataSourceCache object. /// protected virtual void LoadViewState(object savedState) { if (savedState != null) { ((IStateManager)ViewState).LoadViewState(savedState); } } ////// Saves data to the ASP.NET cache using the specified key. /// public void SaveDataToCache(string key, object data) { SaveDataToCache(key, data, null); } ////// Saves data to the ASP.NET cache using the specified key and makes /// this entry dependent on the specified dependency. /// public void SaveDataToCache(string key, object data, CacheDependency dependency) { SaveDataToCacheInternal(key, data, dependency); } ////// Saves data to the ASP.NET cache using the specified key, and makes /// it dependent on the specified CacheDependency object. /// Override this method if you need to create your own cache dependencies /// and call this base implementation to actually save the data to the /// cache with the standard properties (expiration policy, duration, etc.). /// protected virtual void SaveDataToCacheInternal(string key, object data, CacheDependency dependency) { if (String.IsNullOrEmpty(key)) { throw new ArgumentNullException("key"); } Debug.Assert(key.StartsWith(CacheInternal.PrefixDataSourceControl, StringComparison.Ordinal), "All keys passed in should start with the prefix specified in CacheInternal.PrefixDataSourceControl."); if (!Enabled) { throw new InvalidOperationException(SR.GetString(SR.DataSourceCache_CacheMustBeEnabled)); } DateTime utcAbsoluteExpiryTime = Cache.NoAbsoluteExpiration; TimeSpan slidingExpiryTimeSpan = Cache.NoSlidingExpiration; switch (ExpirationPolicy) { case DataSourceCacheExpiry.Absolute: // The caching APIs for absolute expiry expect a duration of 0 to mean no expiry, // but for us it means infinite so we use Int32.MaxValue instead. utcAbsoluteExpiryTime = DateTime.UtcNow.AddSeconds(Duration == 0 ? Int32.MaxValue : Duration); break; case DataSourceCacheExpiry.Sliding: slidingExpiryTimeSpan = TimeSpan.FromSeconds(Duration); break; } AggregateCacheDependency aggregateCacheDependency = new AggregateCacheDependency(); // Set up key dependency, if any string[] keyDependencies = null; if (KeyDependency.Length > 0) { keyDependencies = new string[] { KeyDependency }; aggregateCacheDependency.Add(new CacheDependency[] { new CacheDependency(null, keyDependencies) }); } // If there are any additional dependencies, create a new CacheDependency for them if (dependency != null) { aggregateCacheDependency.Add(new CacheDependency[] { dependency }); } HttpRuntime.CacheInternal.UtcInsert(key, data, aggregateCacheDependency, utcAbsoluteExpiryTime, slidingExpiryTimeSpan); } ////// Saves the current state of the DataSourceCache object. /// protected virtual object SaveViewState() { return (_viewState != null ? ((IStateManager)_viewState).SaveViewState() : null); } ////// Starts tracking view state. /// protected void TrackViewState() { _tracking = true; if (_viewState != null) { _viewState.TrackViewState(); } } #region IStateManager implementation ///bool IStateManager.IsTrackingViewState { get { return _tracking; } } /// void IStateManager.LoadViewState(object savedState) { LoadViewState(savedState); } /// object IStateManager.SaveViewState() { return SaveViewState(); } /// void IStateManager.TrackViewState() { TrackViewState(); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System.ComponentModel; using System.Web.Caching; using System.Web.Util; internal class DataSourceCache : IStateManager { public const int Infinite = 0; private bool _tracking; private StateBag _viewState; ////// The duration, in seconds, of the expiration. The expiration policy is specified by the ExpirationPolicy property. /// public virtual int Duration { get { object o = ViewState["Duration"]; if (o != null) return (int)o; return Infinite; } set { if (value < 0) { throw new ArgumentOutOfRangeException("value", SR.GetString(SR.DataSourceCache_InvalidDuration)); } ViewState["Duration"] = value; } } ////// Whether caching is enabled for this data source. /// public virtual bool Enabled { get { object o = ViewState["Enabled"]; if (o != null) return (bool)o; return false; } set { ViewState["Enabled"] = value; } } ////// The expiration policy of the cache. The duration for the expiration is specified by the Duration property. /// public virtual DataSourceCacheExpiry ExpirationPolicy { get { object o = ViewState["ExpirationPolicy"]; if (o != null) return (DataSourceCacheExpiry)o; return DataSourceCacheExpiry.Absolute; } set { if (value < DataSourceCacheExpiry.Absolute || value > DataSourceCacheExpiry.Sliding) { throw new ArgumentOutOfRangeException(SR.GetString(SR.DataSourceCache_InvalidExpiryPolicy)); } ViewState["ExpirationPolicy"] = value; } } ////// Indicates an arbitrary cache key to make this cache entry depend on. This allows /// the user to further customize when this cache entry will expire. /// [ DefaultValue(""), NotifyParentProperty(true), WebSysDescription(SR.DataSourceCache_KeyDependency), ] public virtual string KeyDependency { get { object o = ViewState["KeyDependency"]; if (o != null) return (string)o; return String.Empty; } set { ViewState["KeyDependency"] = value; } } ////// Indicates a dictionary of state information that allows you to save and restore /// the state of an object across multiple requests for the same page. /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] protected StateBag ViewState { get { if (_viewState == null) { _viewState = new StateBag(); if (_tracking) _viewState.TrackViewState(); } return _viewState; } } ////// Invalidates an ASP.NET cache entry using the specified key. /// SECURITY: This method should never accept user-defined inputs /// because it invalidates the internal ASP.net cache. /// public void Invalidate(string key) { if (String.IsNullOrEmpty(key)) { throw new ArgumentNullException("key"); } Debug.Assert(key.StartsWith(CacheInternal.PrefixDataSourceControl, StringComparison.Ordinal), "All keys passed in should start with the prefix specified in CacheInternal.PrefixDataSourceControl."); if (!Enabled) { throw new InvalidOperationException(SR.GetString(SR.DataSourceCache_CacheMustBeEnabled)); } HttpRuntime.CacheInternal.Remove(key); } ////// Loads data from the ASP.NET cache using the specified key. /// public object LoadDataFromCache(string key) { if (String.IsNullOrEmpty(key)) { throw new ArgumentNullException("key"); } Debug.Assert(key.StartsWith(CacheInternal.PrefixDataSourceControl, StringComparison.Ordinal), "All keys passed in should start with the prefix specified in CacheInternal.PrefixDataSourceControl."); if (!Enabled) { throw new InvalidOperationException(SR.GetString(SR.DataSourceCache_CacheMustBeEnabled)); } return HttpRuntime.CacheInternal.Get(key); } ////// Loads the state of the DataSourceCache object. /// protected virtual void LoadViewState(object savedState) { if (savedState != null) { ((IStateManager)ViewState).LoadViewState(savedState); } } ////// Saves data to the ASP.NET cache using the specified key. /// public void SaveDataToCache(string key, object data) { SaveDataToCache(key, data, null); } ////// Saves data to the ASP.NET cache using the specified key and makes /// this entry dependent on the specified dependency. /// public void SaveDataToCache(string key, object data, CacheDependency dependency) { SaveDataToCacheInternal(key, data, dependency); } ////// Saves data to the ASP.NET cache using the specified key, and makes /// it dependent on the specified CacheDependency object. /// Override this method if you need to create your own cache dependencies /// and call this base implementation to actually save the data to the /// cache with the standard properties (expiration policy, duration, etc.). /// protected virtual void SaveDataToCacheInternal(string key, object data, CacheDependency dependency) { if (String.IsNullOrEmpty(key)) { throw new ArgumentNullException("key"); } Debug.Assert(key.StartsWith(CacheInternal.PrefixDataSourceControl, StringComparison.Ordinal), "All keys passed in should start with the prefix specified in CacheInternal.PrefixDataSourceControl."); if (!Enabled) { throw new InvalidOperationException(SR.GetString(SR.DataSourceCache_CacheMustBeEnabled)); } DateTime utcAbsoluteExpiryTime = Cache.NoAbsoluteExpiration; TimeSpan slidingExpiryTimeSpan = Cache.NoSlidingExpiration; switch (ExpirationPolicy) { case DataSourceCacheExpiry.Absolute: // The caching APIs for absolute expiry expect a duration of 0 to mean no expiry, // but for us it means infinite so we use Int32.MaxValue instead. utcAbsoluteExpiryTime = DateTime.UtcNow.AddSeconds(Duration == 0 ? Int32.MaxValue : Duration); break; case DataSourceCacheExpiry.Sliding: slidingExpiryTimeSpan = TimeSpan.FromSeconds(Duration); break; } AggregateCacheDependency aggregateCacheDependency = new AggregateCacheDependency(); // Set up key dependency, if any string[] keyDependencies = null; if (KeyDependency.Length > 0) { keyDependencies = new string[] { KeyDependency }; aggregateCacheDependency.Add(new CacheDependency[] { new CacheDependency(null, keyDependencies) }); } // If there are any additional dependencies, create a new CacheDependency for them if (dependency != null) { aggregateCacheDependency.Add(new CacheDependency[] { dependency }); } HttpRuntime.CacheInternal.UtcInsert(key, data, aggregateCacheDependency, utcAbsoluteExpiryTime, slidingExpiryTimeSpan); } ////// Saves the current state of the DataSourceCache object. /// protected virtual object SaveViewState() { return (_viewState != null ? ((IStateManager)_viewState).SaveViewState() : null); } ////// Starts tracking view state. /// protected void TrackViewState() { _tracking = true; if (_viewState != null) { _viewState.TrackViewState(); } } #region IStateManager implementation ///bool IStateManager.IsTrackingViewState { get { return _tracking; } } /// void IStateManager.LoadViewState(object savedState) { LoadViewState(savedState); } /// object IStateManager.SaveViewState() { return SaveViewState(); } /// void IStateManager.TrackViewState() { TrackViewState(); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DefaultProxySection.cs
- VBCodeProvider.cs
- ManipulationDeltaEventArgs.cs
- DesignerForm.cs
- WSFederationHttpBindingElement.cs
- SecureEnvironment.cs
- UnhandledExceptionEventArgs.cs
- Rotation3D.cs
- HttpClientChannel.cs
- ImageCollectionCodeDomSerializer.cs
- OptionUsage.cs
- OptimizerPatterns.cs
- Version.cs
- WindowsHyperlink.cs
- RegionData.cs
- OracleDataReader.cs
- COAUTHIDENTITY.cs
- DragStartedEventArgs.cs
- CaseInsensitiveOrdinalStringComparer.cs
- ScrollContentPresenter.cs
- Trace.cs
- EventRouteFactory.cs
- DiscoveryProxy.cs
- CalendarAutoFormat.cs
- RayHitTestParameters.cs
- StringFunctions.cs
- Config.cs
- SqlCaseSimplifier.cs
- Span.cs
- TimeoutHelper.cs
- BoundPropertyEntry.cs
- ConversionContext.cs
- FileSystemEventArgs.cs
- EntityDescriptor.cs
- UIElement3D.cs
- StylusButtonCollection.cs
- MulticastOption.cs
- ServicePointManager.cs
- DeclarativeCatalogPart.cs
- NameSpaceExtractor.cs
- FilterableAttribute.cs
- SecurityKeyUsage.cs
- Matrix.cs
- HtmlTernaryTree.cs
- WebZone.cs
- OLEDB_Enum.cs
- ControlAdapter.cs
- XpsPackagingException.cs
- ScriptMethodAttribute.cs
- ConditionalAttribute.cs
- ServiceErrorHandler.cs
- ExtensionDataObject.cs
- SqlGatherConsumedAliases.cs
- VariableAction.cs
- CodeMemberProperty.cs
- DesignerLoader.cs
- ListBoxAutomationPeer.cs
- SpeechUI.cs
- Win32SafeHandles.cs
- SyntaxCheck.cs
- ProtectedConfigurationSection.cs
- RegexCompiler.cs
- UseLicense.cs
- ExistsInCollection.cs
- DataKey.cs
- ByteStorage.cs
- linebase.cs
- XamlBrushSerializer.cs
- XAMLParseException.cs
- InsufficientMemoryException.cs
- BitmapEffect.cs
- XPathDocumentIterator.cs
- RegistrySecurity.cs
- RunWorkerCompletedEventArgs.cs
- SpeechDetectedEventArgs.cs
- MsmqIntegrationAppDomainProtocolHandler.cs
- CodeDomConfigurationHandler.cs
- DBBindings.cs
- SqlConnectionFactory.cs
- RuntimeConfigurationRecord.cs
- CookieParameter.cs
- WebPartsPersonalization.cs
- DetailsViewModeEventArgs.cs
- URIFormatException.cs
- AdCreatedEventArgs.cs
- WizardStepBase.cs
- CheckPair.cs
- SetIterators.cs
- XPathDescendantIterator.cs
- ListGeneralPage.cs
- KnownTypeDataContractResolver.cs
- PathGeometry.cs
- TextEndOfLine.cs
- SiteMapHierarchicalDataSourceView.cs
- InteropBitmapSource.cs
- TdsRecordBufferSetter.cs
- ParameterToken.cs
- PopupRoot.cs
- Serializer.cs
- RangeValuePattern.cs