Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ControlCachePolicy.cs / 1 / ControlCachePolicy.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System; using System.IO; using System.Text; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.ComponentModel.Design; using System.Globalization; using System.Web; using System.Web.Util; using System.Web.UI.WebControls; using System.Web.Caching; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class ControlCachePolicy { private static ControlCachePolicy _cachePolicyStub = new ControlCachePolicy(); private BasePartialCachingControl _pcc; internal ControlCachePolicy() { } internal ControlCachePolicy(BasePartialCachingControl pcc) { _pcc = pcc; } internal static ControlCachePolicy GetCachePolicyStub() { // Return a stub, which returns SupportsCaching==false and throws on everything else. return _cachePolicyStub; } // Check whether it is valid to access properties on this object private void CheckValidCallingContext() { // If it's not being cached, the CachePolicy can't be used if (_pcc == null) { throw new HttpException( SR.GetString(SR.UC_not_cached)); } // Make sure it's not being used too late if (_pcc.ControlState >= ControlState.PreRendered) { throw new HttpException( SR.GetString(SR.UCCachePolicy_unavailable)); } } public bool SupportsCaching { get { // Caching is supported if we have a PartialCachingControl return (_pcc != null); } } public bool Cached { get { CheckValidCallingContext(); return !_pcc._cachingDisabled; } set { CheckValidCallingContext(); _pcc._cachingDisabled = !value; } } public TimeSpan Duration { get { CheckValidCallingContext(); return _pcc.Duration; } set { CheckValidCallingContext(); _pcc.Duration = value; } } public HttpCacheVaryByParams VaryByParams { get { CheckValidCallingContext(); return _pcc.VaryByParams; } } public string VaryByControl { get { CheckValidCallingContext(); return _pcc.VaryByControl; } set { CheckValidCallingContext(); _pcc.VaryByControl = value; } } public CacheDependency Dependency { get { CheckValidCallingContext(); return _pcc.Dependency; } set { CheckValidCallingContext(); _pcc.Dependency = value; } } public void SetVaryByCustom(string varyByCustom) { CheckValidCallingContext(); _pcc._varyByCustom = varyByCustom; } public void SetSlidingExpiration(bool useSlidingExpiration) { CheckValidCallingContext(); _pcc._useSlidingExpiration = useSlidingExpiration; } public void SetExpires(DateTime expirationTime) { CheckValidCallingContext(); _pcc._utcExpirationTime = DateTimeUtil.ConvertToUniversalTime(expirationTime); } } }
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