{"id":16922,"date":"2018-06-18T20:34:55","date_gmt":"2018-06-18T11:34:55","guid":{"rendered":"http:\/\/www.ricka.co.jp\/?p=16922"},"modified":"2018-06-18T20:34:55","modified_gmt":"2018-06-18T11:34:55","slug":"cs-how-use-task-cancellationtoken","status":"publish","type":"post","link":"https:\/\/ricka.co.jp\/?p=16922","title":{"rendered":"C# Task\u306e\u5f15\u6570\u306b\u4f7f\u3046CancellationToken\u306f\u4f55\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u306e\u304b\uff1f"},"content":{"rendered":"

 <\/p>\n

\u306f\u3058\u3081\u306b<\/h2>\n

Task\u306e\u30ad\u30e3\u30f3\u30bb\u30eb\u5468\u308a\u306e\u5b9f\u88c5\u3067\u3001\u3075\u3068\u601d\u3044\u307e\u3057\u305f\u3002
\nCancellationToken\u3092Task\u958b\u59cb\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u6307\u5b9a\u3067\u304d\u308b\u3051\u3069\u3001
\n\u30e9\u30e0\u30c0\u306e\u5916\u3067\u5b9a\u7fa9\u3057\u305ftoken\u3092\u4f7f\u3046\u3093\u3060\u304b\u3089\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u3088\u304f\u306a\u3044\uff1f\uff1f
\n\u4f55\u304b\u7406\u7531\u304c\u3042\u308b\u306e\u3060\u308d\u3046\u304b\uff1f\uff1f<\/p>\n

CancellationTokenSource tokenSource = new CancellationTokenSource();\nCancellationToken token = tokenSource.Token;\n\nTask.Factory.StartNew(() =>\n{\n    \/* \u975e\u540c\u671f\u306e\u51e6\u7406 *\/\n    if (token.IsCancellationRequested) { return; }\n}, token\/*<-\u3053\u3044\u3064\u306a\uff01\uff01*\/);<\/code><\/pre>\n
 <\/p>\n
\u6307\u5b9a\u3059\u308b\u7406\u7531<\/h2>\n
\u8272\u3005\u63a2\u3057\u3066\u3044\u305f\u3089\u540c\u3058\u7591\u554f\u3092\u898b\u3064\u3051\u307e\u3057\u305f\u3002
\nhttps:\/\/stackoverflow.com\/questions\/3712939\/cancellation-token-in-task-constructor-why<\/a><\/p>\n
    \n
  1. \u30bf\u30b9\u30af\u958b\u59cb\u524d\u306b\u30c8\u30fc\u30af\u30f3\u304c\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u3066\u308b\u304b\u306e\u30c1\u30a7\u30c3\u30af\u3002\u30bf\u30b9\u30af\u3092\u958b\u59cb\u3059\u308b\u30b3\u30b9\u30c8\u304c\u6e1b\u308b\u304b\u3089\u3002<\/li>\n
  2. \u30bf\u30b9\u30af\u306e\u30dc\u30c7\u30a3\u30fc\u3067\u3082\u76e3\u8996\u3092\u3057\u3066\u3044\u3066\u3001\u4f8b\u5916\u3092\u6295\u3052\u305f\u30c8\u30fc\u30af\u30f3\u3068\u30dc\u30c7\u30a3\u30fc\u306e\u30c8\u30fc\u30af\u30f3\u304c\u4e00\u81f4\u3059\u308b\u304b\u3092\u898b\u3066\u3044\u3066\u3001\u540c\u3058\u3060\u3063\u305f\u3089\u3001\u30bf\u30b9\u30af\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u306fCanceled\u306b\u306a\u308b\u3002\u666e\u901a\u306f\u3001Faulted\u3002<\/li>\n<\/ol>\n
    \u306a\u308b\u307b\u3069\u3001\u6307\u5b9a\u3059\u308b\u3068\u5c11\u3057\u6319\u52d5\u304c\u5909\u308f\u3063\u305f\u308a\u3001\u30bf\u30b9\u30af\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u304c\u7d30\u304b\u304f\u8a2d\u5b9a\u3055\u308c\u308b\u3068\u3053\u308d\u307f\u305f\u3044\u3067\u3059\u306d\u3002
    \n\u3068\u8a00\u3046\u308f\u3051\u3067\u3001\u3061\u3087\u3044\u3068\u691c\u8a3c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01\uff01<\/p>\n
     <\/p>\n
    \u691c\u8a3c<\/h2>\n
    \u691c\u8a3c\u30d1\u30bf\u30fc\u30f3\u3068\u7d50\u679c\u3092\u66f8\u304d\u307e\u3059\u3002\u30bd\u30fc\u30b9\u306f\u3044\u3063\u3071\u3044\u306b\u306a\u308b\u306e\u3067\u3001\u6700\u5f8c\u306b\u8cbc\u308a\u4ed8\u3051\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n
    VS2017\u3067\u691c\u8a3c<\/p>\n
    \u30d1\u30bf\u30fc\u30f31.Task.Factory.StartNew()\u3092\u4f7f\u7528\u3059\u308b
    \n\u30d1\u30bf\u30fc\u30f32.Task.Run()\u3092\u4f7f\u7528\u3059\u308b<\/p>\n
    A.\u6b63\u5e38\u306bTask\u3092\u7d42\u4e86\u3055\u305b\u308b
    \nB.Task\u5b9f\u884c\u524d\u306b\u30ad\u30e3\u30f3\u30bb\u30eb\u3092\u884c\u3046
    \nC.\u5f15\u6570\u306eCancellationToken\u3068Task\u5185\u306eCancellationToken\u3092\u540c\u4e00\u306e\u3082\u306e\u3092\u4f7f\u7528\u3057\u3001\u5b9f\u884c\u4e2d\u306bCancel\u3092\u884c\u3046
    \nD.\u5f15\u6570\u306eCancellationToken\u3068Task\u5185\u306eCancellationToken\u3092\u5225\u306e\u3082\u306e\u306b\u3057\u3066\u3001\u5b9f\u884c\u4e2d\u306bCancel\u3092\u884c\u3046<\/p>\n\n\n\n\n\n\n\n
    <\/td>\n1.Task.Factory.StartNew()<\/td>\n2.Task.Run()<\/td>\n<\/tr>\n
    A.\u6b63\u5e38\u306bTask\u3092\u7d42\u4e86\u3055\u305b\u308b<\/td>\nTask\u5b9f\u884c\u5f8c\uff0bRanToComplation<\/td>\nTask\u5b9f\u884c\u5f8c\uff0bRanToComplation<\/td>\n<\/tr>\n
    B.Task\u5b9f\u884c\u524d\u306b\u30ad\u30e3\u30f3\u30bb\u30eb\u3092\u884c\u3046<\/td>\nTask\u5b9f\u884c\u305b\u305aCanceld<\/td>\nTask\u5b9f\u884c\u305b\u305aCanceld<\/td>\n<\/tr>\n
    C.\u5f15\u6570\u306eCancellationToken\u3068Task\u5185\u306eCancellationToken\u3092\u540c\u4e00\u306e\u3082\u306e\u3092\u4f7f\u7528\u3057\u3001\u5b9f\u884c\u4e2d\u306bCancel\u3092\u884c\u3046<\/td>\n\u4f8b\u5916\u3092\u767a\u751f\u3055\u305bCanceld<\/td>\n\u4f8b\u5916\u3092\u767a\u751f\u3055\u305bCanceld<\/td>\n<\/tr>\n
    D.\u5f15\u6570\u306eCancellationToken\u3068Task\u5185\u306eCancellationToken\u3092\u5225\u306e\u3082\u306e\u306b\u3057\u3066\u3001\u5b9f\u884c\u4e2d\u306bCancel\u3092\u884c\u3046<\/td>\n\u4f8b\u5916\u767a\u751f\u3057Faulted<\/span><\/td>\n\u4f8b\u5916\u3092\u767a\u751f\u3055\u305bCanceld<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
     <\/p>\n
    Task.Factory.StartNew()\u306f\u8a00\u308f\u308c\u3066\u3044\u305f\u7d50\u679c\u901a\u308a\u306b\u306a\u308a\u307e\u3057\u305f\u3002
    \n\u3057\u304b\u3057\u3001Task.Run()\u306f\u30bf\u30b9\u30af\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u304cFaulted\u306b\u5909\u308f\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002
    \n\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u898b\u308b\u3068\u304d\u306b\u306f\u5c11\u3057\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u306d\u3002<\/p>\n
    \u203b\u3066\u8a00\u3046\u304b\u3001D\u307f\u305f\u3044\u306a\u610f\u5473\u306e\u5206\u304b\u3089\u306a\u3044\u4f7f\u3044\u65b9\u306f\u3057\u306a\u3044\u3060\u308d\u3046\u3057\u3001\u30e1\u30f3\u30d0\u3067\u6301\u3063\u3066\u308bCancellationTokenSource\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u5909\u308f\u3063\u3066\u3057\u307e\u3046\u306e\u3082\u8a2d\u8a08\u304c\u60aa\u305d\u3046\u3060\u3057…<\/p>\n
     <\/p>\n
    Task\u3092Cancel\u3057\u3066\u308f\u304b\u3063\u305f\u3053\u3068<\/h2>\n
    \u305d\u306e\u4ed6\u3001\u30ad\u30e3\u30f3\u30bb\u30eb\u3057\u305f\u6642\u306e\u6319\u52d5\u3067\u5206\u304b\u3063\u305f\u3053\u3068\u3082\u66f8\u3044\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n
    \u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u305f\u30bf\u30b9\u30af\u306eWait\u3092\u884c\u3046\u3068\u4f8b\u5916(TaskCanceledException: A task was canceled.)\u304c\u767a\u751f\u3059\u308b\u3002
    \n\u305d\u306e\u305f\u3081\u3001\u30ad\u30e3\u30f3\u30bb\u30eb\u3092\u524d\u63d0\u3068\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u4f8b\u5916\u51e6\u7406\u304c\u5fc5\u8981\u3002<\/p>\n
    \u30ad\u30e3\u30f3\u30bb\u30eb\u306e\u53cd\u6620\u304c\u9045\u3044\u306e\u3067\u3001Delay\u3092\u304b\u3051\u306a\u3044\u3068WaitingToRun\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u3063\u305f\u3002
    \n\u51e6\u7406\u306b\u30b9\u30c6\u30fc\u30bf\u30b9\u5224\u5b9a\u3092\u3057\u3066\u3044\u308b\u6642\u306f\u30bf\u30a4\u30e0\u30e9\u30b0\u306b\u6ce8\u610f\u3002<\/p>\n
     <\/p>\n
    \u6700\u5f8c\u306b<\/h2>\n
    \u6700\u521d\u306b\u307e\u3068\u307e\u3063\u3066\u305f\u3093\u3067\u3059\u3051\u3069\u3001\u4eca\u56de\u306f\u3058\u3063\u304f\u308a\u691c\u8a3c\u3057\u305f\u306e\u3067\u30d6\u30ed\u30b0\u306b\u3057\u307e\u3057\u305f\u3002
    \n\u7591\u554f\u306b\u601d\u3063\u305f\u65b9\u306e\u89e3\u6c7a\u306b\u306a\u308c\u3070\u5e78\u3044\u3067\u3059\u3002
    \n\u305d\u3057\u3066\u3001\u6700\u5f8c\u306b\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u8cbc\u308a\u307e\u3059\u3002<\/p>\n
     <\/p>\n
    \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9<\/h2>\n
    \/\/ \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306e\u67a0---\u958b\u59cb---\nusing System;\nusing System.Threading;\nusing System.Threading.Tasks;\n\nnamespace task\n{\n    class Program\n    {\n        \/\/ \u4e00\u500b\u305a\u3064\u5165\u308c\u308b\n    }\n}\n\/\/ \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u306e\u67a0---\u7d42\u4e86---<\/span>\n\n\/\/ 1-A\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    Task t = Task.Factory.StartNew(() =>\n    {\n        Console.WriteLine(\"\u5b9f\u884c\u3057\u305f\u3088\");\n    }, token);\n    t.Wait();\n\n    Console.WriteLine(t.Status.ToString());\n\n    Console.ReadKey();\n}\n\n\/\/ 1-B\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    tokenSource.Cancel();\n    Task t = Task.Factory.StartNew(() =>\n    {\n        Console.WriteLine(\"\u5b9f\u884c\u3057\u305f\u3088\");\n    }, token);\n    \/\/t.Wait();\n    Task.Delay(2000);\n\n    Console.WriteLine(t.Status.ToString());\n\n    Console.ReadKey();\n}\n\n\/\/ 1-C\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    Task t = Task.Factory.StartNew(() =>\n    {\n        while (true)\n        {\n            token.ThrowIfCancellationRequested();\n        }\n    }, token).ContinueWith((_t) =>\n    {\n        Console.WriteLine(_t.Status.ToString());\n    });\n    Task.Delay(1000);\n    tokenSource.Cancel();\n\n    Console.ReadKey();\n}\n\n\/\/ 1-D\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    CancellationTokenSource tokenSource2 = new CancellationTokenSource();\n    CancellationToken token2 = tokenSource2.Token;\n\n    Task t = Task.Factory.StartNew(() =>\n    {\n        while (true)\n        {\n            token.ThrowIfCancellationRequested();\n        }\n    }, token2).ContinueWith((_t) =>\n    {\n        Console.WriteLine(_t.Status.ToString());\n    });\n    Task.Delay(1000);\n    tokenSource.Cancel();\n\n    Console.ReadKey();\n}\n\n\/\/ 2-A\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    Task t = Task.Run(() =>\n    {\n        Console.WriteLine(\"\u5b9f\u884c\u3057\u305f\u3088\");\n    }, token);\n    t.Wait();\n\n    Console.WriteLine(t.Status.ToString());\n\n    Console.ReadKey();\n}\n\n\/\/ 2-B\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    tokenSource.Cancel();\n    Task t = Task.Run(() =>\n    {\n        Console.WriteLine(\"\u5b9f\u884c\u3057\u305f\u3088\");\n    }, token);\n    \/\/t.Wait();\n    Task.Delay(2000);\n\n    Console.WriteLine(t.Status.ToString());\n\n    Console.ReadKey();\n}\n\n\/\/ 2-C\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    Task t = Task.Run(() =>\n    {\n        while (true)\n        {\n            token.ThrowIfCancellationRequested();\n        }\n    }, token).ContinueWith((_t) =>\n    {\n        Console.WriteLine(_t.Status.ToString());\n    });\n    Task.Delay(1000);\n    tokenSource.Cancel();\n\n    Console.ReadKey();\n}\n\n\/\/ 2-D\nstatic void Main(string[] args)\n{\n    CancellationTokenSource tokenSource = new CancellationTokenSource();\n    CancellationToken token = tokenSource.Token;\n\n    CancellationTokenSource tokenSource2 = new CancellationTokenSource();\n    CancellationToken token2 = tokenSource2.Token;\n\n    Task t = Task.Run(() =>\n    {\n        while (true)\n        {\n            token.ThrowIfCancellationRequested();\n        }\n    }, token2).ContinueWith((_t) =>\n    {\n        Console.WriteLine(_t.Status.ToString());\n    });\n    Task.Delay(1000);\n    tokenSource.Cancel();\n\n    Console.ReadKey();\n}\n<\/code><\/pre>\n