Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / 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 } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- versioninfo.cs
- ClientSettingsProvider.cs
- IISUnsafeMethods.cs
- PixelShader.cs
- Line.cs
- RangeExpression.cs
- GraphicsContext.cs
- ServiceOperationUIEditor.cs
- LongValidator.cs
- Property.cs
- PanelStyle.cs
- PackageRelationshipSelector.cs
- PackWebRequest.cs
- EncryptedKey.cs
- InputBuffer.cs
- MDIControlStrip.cs
- Intellisense.cs
- EmptyElement.cs
- path.cs
- InstanceDataCollection.cs
- DataGridViewAutoSizeColumnModeEventArgs.cs
- SqlTypeSystemProvider.cs
- ResourceContainer.cs
- InputScopeConverter.cs
- XmlAggregates.cs
- WSHttpBindingBaseElement.cs
- RawUIStateInputReport.cs
- TextFragmentEngine.cs
- QilChoice.cs
- ComponentEditorForm.cs
- UnsafeNativeMethods.cs
- CompilationSection.cs
- PagerSettings.cs
- SocketElement.cs
- RootBrowserWindow.cs
- ManagementEventArgs.cs
- EventLogEntryCollection.cs
- StorageAssociationSetMapping.cs
- Avt.cs
- UnionCqlBlock.cs
- Tokenizer.cs
- BuildProvider.cs
- PrintPreviewControl.cs
- WindowsStatic.cs
- EnvelopedPkcs7.cs
- NativeCppClassAttribute.cs
- RuleSettingsCollection.cs
- DataContext.cs
- TemplateBindingExpression.cs
- HwndSourceParameters.cs
- IpcServerChannel.cs
- SqlProfileProvider.cs
- SqlMultiplexer.cs
- Statements.cs
- Misc.cs
- PhysicalFontFamily.cs
- TemplatedControlDesigner.cs
- DBSqlParser.cs
- ValidationHelper.cs
- TiffBitmapDecoder.cs
- X509Certificate2Collection.cs
- CodeTypeReference.cs
- FileLogRecordHeader.cs
- LiteralTextParser.cs
- SignedPkcs7.cs
- BreakRecordTable.cs
- DataGridViewColumnCollection.cs
- ActivityWithResultWrapper.cs
- FieldNameLookup.cs
- SystemNetworkInterface.cs
- UriWriter.cs
- DataGridViewCellValidatingEventArgs.cs
- Help.cs
- ToolStripDesigner.cs
- StylusButtonEventArgs.cs
- DependencyStoreSurrogate.cs
- XmlSchemaExternal.cs
- Touch.cs
- FtpRequestCacheValidator.cs
- BindToObject.cs
- LazyTextWriterCreator.cs
- PeerCollaborationPermission.cs
- RecipientInfo.cs
- EntitySqlQueryCacheKey.cs
- ByteAnimation.cs
- TokenBasedSet.cs
- SafeFileHandle.cs
- CodeAttachEventStatement.cs
- SqlNotificationEventArgs.cs
- PropertyCondition.cs
- MultiAsyncResult.cs
- CookieParameter.cs
- DataRowCollection.cs
- WindowsHyperlink.cs
- SqlError.cs
- SupportsEventValidationAttribute.cs
- ResponseBodyWriter.cs
- SafeSecurityHelper.cs
- Point3DConverter.cs
- WeakReference.cs