TaskExtensionsImpl.cs System::Threading::Tasks::TaskExtensionsImpl System System::Threading System::Threading::Tasks // //TaskExtensionsImpl.cs // //Authors: //Jérémie"Garuma"Laval<jeremie.laval@gmail.com> //MarekSafar(marek.safar@gmail.com) // //Copyright(c)2010Jérémie"Garuma"Laval //Copyright(C)2013Xamarin,Inc(http://www.xamarin.com) // //Permissionisherebygranted,freeofcharge,toanypersonobtaining //acopyofthissoftwareandassociateddocumentationfiles(the //"Software"),todealintheSoftwarewithoutrestriction,including //withoutlimitationtherightstouse,copy,modify,merge,publish, //distribute,sublicense,and/orsellcopiesoftheSoftware,andto //permitpersonstowhomtheSoftwareisfurnishedtodoso,subjectto //thefollowingconditions: // //Theabovecopyrightnoticeandthispermissionnoticeshallbe //includedinallcopiesorsubstantialportionsoftheSoftware. // //THESOFTWAREISPROVIDED"ASIS",WITHOUTWARRANTYOFANYKIND, //EXPRESSORIMPLIED,INCLUDINGBUTNOTLIMITEDTOTHEWARRANTIESOF //MERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEAND //NONINFRINGEMENT.INNOEVENTSHALLTHEAUTHORSORCOPYRIGHTHOLDERSBE //LIABLEFORANYCLAIM,DAMAGESOROTHERLIABILITY,WHETHERINANACTION //OFCONTRACT,TORTOROTHERWISE,ARISINGFROM,OUTOFORINCONNECTION //WITHTHESOFTWAREORTHEUSEOROTHERDEALINGSINTHESOFTWARE. // #ifNET_4_0||UNITY_5_3_OR_NEWER namespaceSystem.Threading.Tasks { staticclassTaskExtensionsImpl { constTaskContinuationOptionsoptions=TaskContinuationOptions.ExecuteSynchronously; publicstaticTask<TResult>Unwrap<TResult>(Task<Task<TResult>>task) { varsrc=newTaskCompletionSource<TResult>(); task.ContinueWith((t,arg)=>Cont(t,(TaskCompletionSource<TResult>)arg),src,CancellationToken.None,options,TaskScheduler.Current); returnsrc.Task; } publicstaticTaskUnwrap(Task<Task>task) { varsrc=newTaskCompletionSource<object>(); task.ContinueWith((t,arg)=>Cont(t,(TaskCompletionSource<object>)arg),src,CancellationToken.None,options,TaskScheduler.Current); returnsrc.Task; } staticvoidSetResult(Tasksource,TaskCompletionSource<object>dest) { if(source.IsCanceled) dest.SetCanceled(); elseif(source.IsFaulted) dest.SetException(source.Exception.InnerExceptions); else dest.SetResult(null); } staticvoidCont(Task<Task>source,TaskCompletionSource<object>dest) { if(source.IsCanceled) dest.SetCanceled(); elseif(source.IsFaulted) dest.SetException(source.Exception.InnerExceptions); else source.Result.ContinueWith((t,arg)=>SetResult(t,(TaskCompletionSource<object>)arg),dest,CancellationToken.None,options,TaskScheduler.Current); } staticvoidSetResult<TResult>(Task<TResult>source,TaskCompletionSource<TResult>dest) { if(source.IsCanceled) dest.SetCanceled(); elseif(source.IsFaulted) dest.SetException(source.Exception.InnerExceptions); else dest.SetResult(source.Result); } staticvoidCont<TResult>(Task<Task<TResult>>source,TaskCompletionSource<TResult>dest) { if(source.IsCanceled) dest.SetCanceled(); elseif(source.IsFaulted) dest.SetException(source.Exception.InnerExceptions); else source.Result.ContinueWith((t,arg)=>SetResult(t,(TaskCompletionSource<TResult>)arg),dest,CancellationToken.None,options,TaskScheduler.Current); } } } #endif