CancellationToken.cs System::Threading::CancellationToken System System::Threading // //CancellationToken.cs // //Authors: //Jérémie"Garuma"Laval<jeremie.laval@gmail.com> //MarekSafar(marek.safar@gmail.com) // //Copyright(c)2009Jérémie"Garuma"Laval //Copyright2011Xamarin,Inc(http://www.xamarin.com) // //Permissionisherebygranted,freeofcharge,toanypersonobtainingacopy //ofthissoftwareandassociateddocumentationfiles(the"Software"),todeal //intheSoftwarewithoutrestriction,includingwithoutlimitationtherights //touse,copy,modify,merge,publish,distribute,sublicense,and/orsell //copiesoftheSoftware,andtopermitpersonstowhomtheSoftwareis //furnishedtodoso,subjecttothefollowingconditions: // //Theabovecopyrightnoticeandthispermissionnoticeshallbeincludedin //allcopiesorsubstantialportionsoftheSoftware. // //THESOFTWAREISPROVIDED"ASIS",WITHOUTWARRANTYOFANYKIND,EXPRESSOR //IMPLIED,INCLUDINGBUTNOTLIMITEDTOTHEWARRANTIESOFMERCHANTABILITY, //FITNESSFORAPARTICULARPURPOSEANDNONINFRINGEMENT.INNOEVENTSHALLTHE //AUTHORSORCOPYRIGHTHOLDERSBELIABLEFORANYCLAIM,DAMAGESOROTHER //LIABILITY,WHETHERINANACTIONOFCONTRACT,TORTOROTHERWISE,ARISINGFROM, //OUTOFORINCONNECTIONWITHTHESOFTWAREORTHEUSEOROTHERDEALINGSIN //THESOFTWARE. #ifNET_4_0||UNITY_5_3_OR_NEWER usingSystem; usingSystem.Threading; usingSystem.Diagnostics; namespaceSystem.Threading { [DebuggerDisplay("IsCancellationRequested={IsCancellationRequested}")] publicstructCancellationToken { readonlyCancellationTokenSourcesource; publicCancellationToken(boolcanceled) :this(canceled?CancellationTokenSource.CanceledSource:null) { } internalCancellationToken(CancellationTokenSourcesource) { this.source=source; } publicstaticCancellationTokenNone{ get{ //simplyreturnnewstructvalue,it'sthefastestoption //andwedon'thavetobotherwithresetingsource returnnewCancellationToken(); } } publicCancellationTokenRegistrationRegister(Actioncallback) { returnRegister(callback,false); } publicCancellationTokenRegistrationRegister(Actioncallback,booluseSynchronizationContext) { if(callback==null) thrownewArgumentNullException("callback"); returnSource.Register(callback,useSynchronizationContext); } publicCancellationTokenRegistrationRegister(Action<object>callback,objectstate) { returnRegister(callback,state,false); } publicCancellationTokenRegistrationRegister(Action<object>callback,objectstate,booluseSynchronizationContext) { if(callback==null) thrownewArgumentNullException("callback"); returnRegister(()=>callback(state),useSynchronizationContext); } publicvoidThrowIfCancellationRequested() { if(Source.IsCancellationRequested) thrownewThreading.OperationCanceledException(this); } publicboolEquals(CancellationTokenother) { returnthis.Source==other.Source; } publicoverrideboolEquals(objectother) { return(otherisCancellationToken)?Equals((CancellationToken)other):false; } publicoverrideintGetHashCode() { returnSource.GetHashCode(); } publicstaticbooloperator == (CancellationTokenleft,CancellationTokenright) { returnleft.Equals(right); } publicstaticbooloperator != (CancellationTokenleft,CancellationTokenright) { return!left.Equals(right); } publicboolCanBeCanceled{ get{ returnsource!=null; } } publicboolIsCancellationRequested{ get{ returnSource.IsCancellationRequested; } } publicWaitHandleWaitHandle{ get{ returnSource.WaitHandle; } } CancellationTokenSourceSource{ get{ returnsource??CancellationTokenSource.NoneSource; } } } } #endif