Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / DEVDIV / depot / DevDiv / releases / whidbey / QFE / ndp / fx / src / xsp / System / Web / UI / DataSourceCache.cs / 2 / 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. //------------------------------------------------------------------------------ // // 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- _SSPIWrapper.cs
- UdpDuplexChannel.cs
- NumberFormatter.cs
- PassportIdentity.cs
- DesignerActionVerbList.cs
- XmlAtomicValue.cs
- XmlSchemaAttributeGroupRef.cs
- ToolStripPanel.cs
- FormViewModeEventArgs.cs
- Rotation3D.cs
- MatrixCamera.cs
- AuthenticationModulesSection.cs
- Panel.cs
- TimeSpanSecondsConverter.cs
- ClickablePoint.cs
- StrokeDescriptor.cs
- ServerIdentity.cs
- pingexception.cs
- UpdateDelegates.Generated.cs
- WebPartConnectionCollection.cs
- CollectionConverter.cs
- Utils.cs
- ShapingWorkspace.cs
- ConfigViewGenerator.cs
- LineInfo.cs
- PolicyLevel.cs
- DtcInterfaces.cs
- GridItemCollection.cs
- PointLightBase.cs
- RuntimeArgumentHandle.cs
- Gdiplus.cs
- ProgressiveCrcCalculatingStream.cs
- SqlDependencyUtils.cs
- SessionStateContainer.cs
- CachedCompositeFamily.cs
- IOException.cs
- SerializationHelper.cs
- HttpModulesSection.cs
- RequiredFieldValidator.cs
- EFColumnProvider.cs
- CompilerError.cs
- AuthenticationException.cs
- WorkflowRuntimeServiceElement.cs
- SqlDataAdapter.cs
- ByteStreamMessageEncoderFactory.cs
- StringBuilder.cs
- WindowsSlider.cs
- StreamingContext.cs
- AppearanceEditorPart.cs
- SqlDataSourceSelectingEventArgs.cs
- SiteIdentityPermission.cs
- FunctionMappingTranslator.cs
- Floater.cs
- ProgressChangedEventArgs.cs
- Vector.cs
- CompositeCollection.cs
- Char.cs
- EntityDataSourceChangedEventArgs.cs
- SqlLiftWhereClauses.cs
- CaseInsensitiveHashCodeProvider.cs
- SerialErrors.cs
- AudioLevelUpdatedEventArgs.cs
- ExpressionSelection.cs
- ExtendLockCommand.cs
- CultureTableRecord.cs
- PackWebResponse.cs
- EmptyControlCollection.cs
- HttpWebRequestElement.cs
- QilTernary.cs
- PathGradientBrush.cs
- Pts.cs
- RegexStringValidator.cs
- StoreItemCollection.Loader.cs
- PrePrepareMethodAttribute.cs
- IxmlLineInfo.cs
- AlternateViewCollection.cs
- ScriptControl.cs
- HttpResponseHeader.cs
- DesignBindingConverter.cs
- ProfileInfo.cs
- NetStream.cs
- AnnotationObservableCollection.cs
- GenericIdentity.cs
- CodeAttributeDeclaration.cs
- WebPartCatalogAddVerb.cs
- QueryOutputWriter.cs
- DefaultValueAttribute.cs
- HyperlinkAutomationPeer.cs
- LinqDataSourceDisposeEventArgs.cs
- FunctionDescription.cs
- ReadOnlyAttribute.cs
- OleCmdHelper.cs
- CharAnimationUsingKeyFrames.cs
- CurrentChangingEventArgs.cs
- SqlClientPermission.cs
- SqlConnectionPoolGroupProviderInfo.cs
- Matrix.cs
- DataContractSerializerFaultFormatter.cs
- AdCreatedEventArgs.cs
- PageAsyncTask.cs