Task.ContinueWith Task.ContinueWith Task.ContinueWith Task.ContinueWith Method

定義

ターゲットの Task が完了したときに非同期に実行する継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes.

オーバーロード

ContinueWith(Action<Task,Object>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task,Object>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task,Object>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler)

呼び出し元から提供される状態情報およびキャンセル トークンを受け取り、対象の Task の完了時に実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and a cancellation token and that executes when the target Task completes. 継続タスクは、指定した一連の条件に基づき、指定したスケジューラを使用して実行されます。The continuation executes based on a set of specified conditions and uses a specified scheduler.

ContinueWith(Action<Task>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task>, CancellationToken, TaskContinuationOptions, TaskScheduler)

対象のタスクが完了したときに、指定した TaskContinuationOptions に従って実行される継続タスクを作成します。Creates a continuation that executes when the target task competes according to the specified TaskContinuationOptions. この継続タスクは、キャンセル トークンを受け取り、指定されたスケジューラを使用します。The continuation receives a cancellation token and uses a specified scheduler.

ContinueWith(Action<Task,Object>, Object, TaskScheduler) ContinueWith(Action<Task,Object>, Object, TaskScheduler) ContinueWith(Action<Task,Object>, Object, TaskScheduler) ContinueWith(Action<Task,Object>, Object, TaskScheduler)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに非同期的に実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes asynchronously when the target Task completes. 継続タスクは、指定されたスケジューラを使用します。The continuation uses a specified scheduler.

ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions) ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions) ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions) ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes when the target Task completes. 継続タスクは、指定した一連の条件に基づいて実行されます。The continuation executes based on a set of specified conditions.

ContinueWith(Action<Task,Object>, Object, CancellationToken) ContinueWith(Action<Task,Object>, Object, CancellationToken) ContinueWith(Action<Task,Object>, Object, CancellationToken)

呼び出し元から提供される状態情報およびキャンセル トークンを受け取り、対象の Task の完了時に非同期的に実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and a cancellation token and that executes asynchronously when the target Task completes.

ContinueWith(Action<Task,Object>, Object) ContinueWith(Action<Task,Object>, Object) ContinueWith(Action<Task,Object>, Object) ContinueWith(Action<Task,Object>, Object)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes when the target Task completes.

ContinueWith(Action<Task>, TaskContinuationOptions) ContinueWith(Action<Task>, TaskContinuationOptions) ContinueWith(Action<Task>, TaskContinuationOptions) ContinueWith(Action<Task>, TaskContinuationOptions)

対象のタスクが完了したときに、指定した TaskContinuationOptions に従って実行される継続タスクを作成します。Creates a continuation that executes when the target task completes according to the specified TaskContinuationOptions.

ContinueWith(Action<Task>, CancellationToken) ContinueWith(Action<Task>, CancellationToken) ContinueWith(Action<Task>, CancellationToken)

キャンセル トークンを受け取って、対象の Task が完了したときに非同期的に実行される継続タスクを作成します。Creates a continuation that receives a cancellation token and executes asynchronously when the target Task completes.

ContinueWith(Action<Task>) ContinueWith(Action<Task>) ContinueWith(Action<Task>) ContinueWith(Action<Task>)

ターゲットの Task が完了したときに非同期に実行する継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes.

ContinueWith(Action<Task>, TaskScheduler) ContinueWith(Action<Task>, TaskScheduler) ContinueWith(Action<Task>, TaskScheduler) ContinueWith(Action<Task>, TaskScheduler)

ターゲットの Task が完了したときに非同期に実行する継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes. 継続タスクは、指定されたスケジューラを使用します。The continuation uses a specified scheduler.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions)

対象の Task が完了したときに、指定したタスク継続オプションに基づいて実行される継続タスクを作成します。Creates a continuation that executes based on the specified task continuation options when the target Task completes. この継続タスクは、呼び出し元から提供される状態情報を受け取ります。The continuation receives caller-supplied state information.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler)

対象の Task が完了したときに、指定したタスク継続オプションに基づいて実行され、値を返す継続タスクを作成します。Creates a continuation that executes based on the specified task continuation options when the target Task completes and returns a value. この継続タスクは、呼び出し元から提供される状態情報とキャンセル トークンを受け取り、指定したスケジューラを使用します。The continuation receives caller-supplied state information and a cancellation token and uses the specified scheduler.

ContinueWith<TResult>(Func<Task,TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

指定された継続のオプションに従って実行され、値を返す継続タスクを作成します。Creates a continuation that executes according to the specified continuation options and returns a value. 継続タスクは、キャンセル トークンを渡され、指定されたスケジューラを使用します。The continuation is passed a cancellation token and uses a specified scheduler.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler)

ターゲットの Task が完了したときに非同期に実行する継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes. この継続タスクは、呼び出し元から提供される状態情報を受け取り、指定したスケジューラを使用します。The continuation receives caller-supplied state information and uses a specified scheduler.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken)

対象の Task が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes and returns a value. この継続タスクは、呼び出し元から提供される状態情報とキャンセル トークンを受け取ります。The continuation receives caller-supplied state information and a cancellation token.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object) ContinueWith<TResult>(Func<Task,Object,TResult>, Object) ContinueWith<TResult>(Func<Task,Object,TResult>, Object) ContinueWith<TResult>(Func<Task,Object,TResult>, Object)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに非同期的に実行され、値を返す継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes asynchronously when the target Task completes and returns a value.

ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions)

指定された継続のオプションに従って実行され、値を返す継続タスクを作成します。Creates a continuation that executes according to the specified continuation options and returns a value.

ContinueWith<TResult>(Func<Task,TResult>, CancellationToken) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken)

対象の Task が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes and returns a value. この継続タスクは、キャンセル トークンを受け取ります。The continuation receives a cancellation token.

ContinueWith<TResult>(Func<Task,TResult>) ContinueWith<TResult>(Func<Task,TResult>) ContinueWith<TResult>(Func<Task,TResult>) ContinueWith<TResult>(Func<Task,TResult>)

対象の Task<TResult> が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task<TResult> completes and returns a value.

ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler)

対象の Task が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 継続タスクは、指定されたスケジューラを使用します。The continuation uses a specified scheduler.

ContinueWith(Action<Task,Object>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task,Object>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task,Object>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler)

呼び出し元から提供される状態情報およびキャンセル トークンを受け取り、対象の Task の完了時に実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and a cancellation token and that executes when the target Task completes. 継続タスクは、指定した一連の条件に基づき、指定したスケジューラを使用して実行されます。The continuation executes based on a set of specified conditions and uses a specified scheduler.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^, System::Object ^> ^ continuationAction, System::Object ^ state, System::Threading::CancellationToken cancellationToken, System::Threading::Tasks::TaskContinuationOptions continuationOptions, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task,object> continuationAction, object state, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Action<System.Threading.Tasks.Task, obj> * obj * System.Threading.CancellationToken * System.Threading.Tasks.TaskContinuationOptions * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task

パラメーター

continuationAction
Action<Task,Object>

Task の完了時に実行するアクション。An action to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続アクションによって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation action.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

新しい継続 TaskA new continuation Task.

例外

scheduler 引数が null です。The scheduler argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

指定された CancellationToken は既に破棄されています。The provided CancellationToken has already been disposed.

注釈

返されたTask現在のタスクが完了するまで実行のスケジュールされません。The returned Task will not be scheduled for execution until the current task has completed. 使用条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith(Action<Task>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith(Action<Task>, CancellationToken, TaskContinuationOptions, TaskScheduler)

対象のタスクが完了したときに、指定した TaskContinuationOptions に従って実行される継続タスクを作成します。Creates a continuation that executes when the target task competes according to the specified TaskContinuationOptions. この継続タスクは、キャンセル トークンを受け取り、指定されたスケジューラを使用します。The continuation receives a cancellation token and uses a specified scheduler.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^> ^ continuationAction, System::Threading::CancellationToken cancellationToken, System::Threading::Tasks::TaskContinuationOptions continuationOptions, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task> continuationAction, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Action<System.Threading.Tasks.Task> * System.Threading.CancellationToken * System.Threading.Tasks.TaskContinuationOptions * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task

パラメーター

continuationAction
Action<Task>

指定した continuationOptions に従って実行するアクション。An action to run according to the specified continuationOptions. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

新しい継続 TaskA new continuation Task.

例外

トークンを作成した CancellationTokenSource は、既に破棄されています。The CancellationTokenSource that created the token has already been disposed.

continuationAction 引数が null です。The continuationAction argument is null.

- または --or- scheduler 引数が null です。The scheduler argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

次に作業を実行するバック グラウンドでと、ユーザー インターフェイス スレッド ContinueWith の使用例を示します。The following is an example of using ContinueWith to run work both in the background and on the user interface threads.


private void Button1_Click(object sender, EventArgs e)  
{  
   var backgroundScheduler = TaskScheduler.Default;  
   var uiScheduler = TaskScheduler.FromCurrentSynchronizationContext();  
   Task.Factory.StartNew(delegate { DoBackgroundComputation(); },  
                         backgroundScheduler).  
   ContinueWith(delegate { UpdateUI(); }, uiScheduler).  
                ContinueWith(delegate { DoAnotherBackgroundComputation(); },  
                             backgroundScheduler).  
                ContinueWith(delegate { UpdateUIAgain(); }, uiScheduler);  
}  

Private Sub Button1_Click(ByVal sender As System.Object,   
                          ByVal e As System.EventArgs) Handles Button1.Click  
   Dim backgroundScheduler = TaskScheduler.Default  
   Dim uiScheduler = TaskScheduler.FromCurrentSynchronizationContext()  

   Task.Factory.StartNew(Sub()  
                           DoBackgroundComputation()  
                         End Sub, backgroundScheduler).ContinueWith(Sub(t)  
                            UpdateUI()  
                         End Sub, uiScheduler).ContinueWith(Sub(t)  
                            DoAnotherBackgroundComputation()  
                         End Sub, backgroundScheduler).ContinueWith(Sub(t)  
                            UpdateUIAgain()  
                         End Sub, uiScheduler)  
End Sub  

注釈

返されたTask現在のタスクが完了するまで実行のスケジュールされません。The returned Task will not be scheduled for execution until the current task has completed. 使用条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith(Action<Task,Object>, Object, TaskScheduler) ContinueWith(Action<Task,Object>, Object, TaskScheduler) ContinueWith(Action<Task,Object>, Object, TaskScheduler) ContinueWith(Action<Task,Object>, Object, TaskScheduler)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに非同期的に実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes asynchronously when the target Task completes. 継続タスクは、指定されたスケジューラを使用します。The continuation uses a specified scheduler.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^, System::Object ^> ^ continuationAction, System::Object ^ state, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task,object> continuationAction, object state, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Action<System.Threading.Tasks.Task, obj> * obj * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task
Public Function ContinueWith (continuationAction As Action(Of Task, Object), state As Object, scheduler As TaskScheduler) As Task

パラメーター

continuationAction
Action<Task,Object>

Task の完了時に実行するアクション。An action to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続アクションによって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation action.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

新しい継続 TaskA new continuation Task.

例外

scheduler 引数が null です。The scheduler argument is null.

注釈

返されたTaskはスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions) ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions) ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions) ContinueWith(Action<Task,Object>, Object, TaskContinuationOptions)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes when the target Task completes. 継続タスクは、指定した一連の条件に基づいて実行されます。The continuation executes based on a set of specified conditions.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^, System::Object ^> ^ continuationAction, System::Object ^ state, System::Threading::Tasks::TaskContinuationOptions continuationOptions);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task,object> continuationAction, object state, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
member this.ContinueWith : Action<System.Threading.Tasks.Task, obj> * obj * System.Threading.Tasks.TaskContinuationOptions -> System.Threading.Tasks.Task
Public Function ContinueWith (continuationAction As Action(Of Task, Object), state As Object, continuationOptions As TaskContinuationOptions) As Task

パラメーター

continuationAction
Action<Task,Object>

Task の完了時に実行するアクション。An action to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続アクションによって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation action.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

戻り値

新しい継続 TaskA new continuation Task.

例外

continuationAction 引数が null です。The continuationAction argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

注釈

返されたTask現在のタスクが完了するまで実行のスケジュールされません。The returned Task will not be scheduled for execution until the current task has completed. を通じて、継続条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the continuation criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith(Action<Task,Object>, Object, CancellationToken) ContinueWith(Action<Task,Object>, Object, CancellationToken) ContinueWith(Action<Task,Object>, Object, CancellationToken)

呼び出し元から提供される状態情報およびキャンセル トークンを受け取り、対象の Task の完了時に非同期的に実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and a cancellation token and that executes asynchronously when the target Task completes.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^, System::Object ^> ^ continuationAction, System::Object ^ state, System::Threading::CancellationToken cancellationToken);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task,object> continuationAction, object state, System.Threading.CancellationToken cancellationToken);
member this.ContinueWith : Action<System.Threading.Tasks.Task, obj> * obj * System.Threading.CancellationToken -> System.Threading.Tasks.Task

パラメーター

continuationAction
Action<Task,Object>

Task の完了時に実行するアクション。An action to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続アクションによって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation action.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

戻り値

新しい継続 TaskA new continuation Task.

例外

continuationAction 引数が null です。The continuationAction argument is null.

指定された CancellationToken は既に破棄されています。The provided CancellationToken has already been disposed.

注釈

返されたTaskはスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith(Action<Task,Object>, Object) ContinueWith(Action<Task,Object>, Object) ContinueWith(Action<Task,Object>, Object) ContinueWith(Action<Task,Object>, Object)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに実行される継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes when the target Task completes.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^, System::Object ^> ^ continuationAction, System::Object ^ state);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task,object> continuationAction, object state);
member this.ContinueWith : Action<System.Threading.Tasks.Task, obj> * obj -> System.Threading.Tasks.Task
Public Function ContinueWith (continuationAction As Action(Of Task, Object), state As Object) As Task

パラメーター

continuationAction
Action<Task,Object>

タスクの完了時に実行するアクション。An action to run when the task completes. 実行されると、完了したタスクと、呼び出し元が指定する状態オブジェクトが、引数としてデリゲートに渡されます。When run, the delegate is passed the completed task and a caller-supplied state object as arguments.

state
Object Object Object Object

継続アクションによって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation action.

戻り値

新しい継続タスク。A new continuation task.

例外

continuationAction 引数が null です。The continuationAction argument is null.

注釈

返されたTaskはスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、またはキャンセルにより早く終了するために完了するかどうか。The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting early due to cancellation.

ContinueWith(Action<Task>, TaskContinuationOptions) ContinueWith(Action<Task>, TaskContinuationOptions) ContinueWith(Action<Task>, TaskContinuationOptions) ContinueWith(Action<Task>, TaskContinuationOptions)

対象のタスクが完了したときに、指定した TaskContinuationOptions に従って実行される継続タスクを作成します。Creates a continuation that executes when the target task completes according to the specified TaskContinuationOptions.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^> ^ continuationAction, System::Threading::Tasks::TaskContinuationOptions continuationOptions);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task> continuationAction, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
member this.ContinueWith : Action<System.Threading.Tasks.Task> * System.Threading.Tasks.TaskContinuationOptions -> System.Threading.Tasks.Task
Public Function ContinueWith (continuationAction As Action(Of Task), continuationOptions As TaskContinuationOptions) As Task

パラメーター

continuationAction
Action<Task>

指定した continuationOptions に従って実行するアクション。An action to run according to the specified continuationOptions. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

戻り値

新しい継続 TaskA new continuation Task.

例外

continuationAction 引数が null です。The continuationAction argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

次の例を使用してTaskContinuationOptionsに継続元タスクの完了時に同期的に継続タスクを実行するように指定します。The following example demonstrates using TaskContinuationOptions to specify that a continuation task should run synchronously when the antecedent task completes. (指定したタスクが時間によって既に完了したかどうかContinueWithが呼び出されると、同期、スレッドの呼び出し元で継続が実行するContinueWith)。(If the specified task has already completed by the time ContinueWith is called, the synchronous continuation will run on the thread calling ContinueWith.)


public class TaskCounter  
{  
   private volatile int _count;  

   public void Track(Task t)  
   {  
      if (t == null) throw new ArgumentNullException("t");  
      Interlocked.Increment(ref _count);  
      t.ContinueWith(ct => Interlocked.Decrement(ref _count), TaskContinuationOptions.ExecuteSynchronously);  
   }  

   public int NumberOfActiveTasks { get { return _count; } }  
}  

Public Class TaskCounter  
   Private _count as Integer  

   Public Sub Track(ByVal t as Task)  
      If t is Nothing Then Throw New ArgumentNullException("t")  
      Interlocked.Increment(_count)  
      t.ContinueWith(Sub(ct)  
                        Interlocked.Decrement(_count)  
                     End Sub,  
                     TaskContinuationOptions.ExecuteSynchronously)  
   End Sub  

   Public ReadOnly Property NumberOfActiveTasks As Integer  
      Get  
         Return _count  
      End Get  
   End Property  
End Class  

注釈

返されたTask現在のタスクが完了するまで実行のスケジュールされません。The returned Task will not be scheduled for execution until the current task has completed. を通じて、継続条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the continuation criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith(Action<Task>, CancellationToken) ContinueWith(Action<Task>, CancellationToken) ContinueWith(Action<Task>, CancellationToken)

キャンセル トークンを受け取って、対象の Task が完了したときに非同期的に実行される継続タスクを作成します。Creates a continuation that receives a cancellation token and executes asynchronously when the target Task completes.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^> ^ continuationAction, System::Threading::CancellationToken cancellationToken);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task> continuationAction, System.Threading.CancellationToken cancellationToken);
member this.ContinueWith : Action<System.Threading.Tasks.Task> * System.Threading.CancellationToken -> System.Threading.Tasks.Task

パラメーター

continuationAction
Action<Task>

Task の完了時に実行するアクション。An action to run when the Task completes. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

戻り値

新しい継続 TaskA new continuation Task.

例外

トークンを作成した CancellationTokenSource は、既に破棄されています。The CancellationTokenSource that created the token has already been disposed.

continuationAction 引数が null です。The continuationAction argument is null.

注釈

返されたTaskはスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith(Action<Task>) ContinueWith(Action<Task>) ContinueWith(Action<Task>) ContinueWith(Action<Task>)

ターゲットの Task が完了したときに非同期に実行する継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^> ^ continuationAction);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task> continuationAction);
member this.ContinueWith : Action<System.Threading.Tasks.Task> -> System.Threading.Tasks.Task
Public Function ContinueWith (continuationAction As Action(Of Task)) As Task

パラメーター

continuationAction
Action<Task>

Task の完了時に実行するアクション。An action to run when the Task completes. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

戻り値

新しい継続 TaskA new continuation Task.

例外

continuationAction 引数が null です。The continuationAction argument is null.

次の例では、100 のランダムな日付と時刻の値を含む配列を設定するタスクを定義します。The following example defines a task that populates an array with 100 random date and time values. 使用して、ContinueWith(Action<Task>)メソッドを配列が完全に設定した後、最も古いと最新の日付値を選択します。It uses the ContinueWith(Action<Task>) method to select the earliest and the latest date values once the array is fully populated.

using System;
using System.Threading.Tasks;

public class Example
{
   public static void Main()
   {
      var firstTask = Task.Factory.StartNew( () => {
                               Random rnd = new Random();
                               DateTime[] dates = new DateTime[100];
                               Byte[] buffer = new Byte[8];
                               int ctr = dates.GetLowerBound(0);
                               while (ctr <= dates.GetUpperBound(0)) {
                                  rnd.NextBytes(buffer);
                                  long ticks = BitConverter.ToInt64(buffer, 0);
                                  if (ticks <= DateTime.MinValue.Ticks | ticks >= DateTime.MaxValue.Ticks)
                                     continue;

                                  dates[ctr] = new DateTime(ticks);
                                  ctr++;
                               }
                               return dates;
                            } ); 
                         
      Task continuationTask = firstTask.ContinueWith( (antecedent) => {
                             DateTime[] dates = antecedent.Result;
                             DateTime earliest = dates[0];
                             DateTime latest = earliest;
                             
                             for (int ctr = dates.GetLowerBound(0) + 1; ctr <= dates.GetUpperBound(0); ctr++) {
                                if (dates[ctr] < earliest) earliest = dates[ctr];
                                if (dates[ctr] > latest) latest = dates[ctr];
                             }
                             Console.WriteLine("Earliest date: {0}", earliest);
                             Console.WriteLine("Latest date: {0}", latest);
                          } );                      
      // Since a console application otherwise terminates, wait for the continuation to complete.
     continuationTask.Wait();
   }
}
// The example displays output like the following:
//       Earliest date: 2/11/0110 12:03:41 PM
//       Latest date: 7/29/9989 2:14:49 PM
Imports System.Threading.Tasks

Module Example
   Public Sub Main()
      Dim firstTask = Task.Factory.StartNew( Function()
                               Dim rnd As New Random()
                               Dim dates(99) As Date
                               Dim buffer(7) As Byte
                               Dim ctr As Integer = dates.GetLowerBound(0)
                               Do While ctr <= dates.GetUpperBound(0)
                                  rnd.NextBytes(buffer)
                                  Dim ticks As Long = BitConverter.ToInt64(buffer, 0)
                                  If ticks <= DateTime.MinValue.Ticks Or ticks >= DateTime.MaxValue.Ticks Then Continue Do

                                  dates(ctr) = New Date(ticks)
                                  ctr += 1
                               Loop
                               Return dates
                            End Function )
                         
      Dim continuationTask As Task = firstTask.ContinueWith( Sub(antecedent)
                             Dim dates() As Date = antecedent.Result
                             Dim earliest As Date = dates(0)
                             Dim latest As Date = earliest
                             
                             For ctr As Integer = dates.GetLowerBound(0) + 1 To dates.GetUpperBound(0)
                                If dates(ctr) < earliest Then earliest = dates(ctr)
                                If dates(ctr) > latest Then latest = dates(ctr)
                             Next
                             Console.WriteLine("Earliest date: {0}", earliest)
                             Console.WriteLine("Latest date: {0}", latest)
                          End Sub)                      
      ' Since a console application otherwise terminates, wait for the continuation to complete.
      continuationTask.Wait()
   End Sub
End Module
' The example displays output like the following:
'       Earliest date: 2/11/0110 12:03:41 PM
'       Latest date: 7/29/9989 2:14:49 PM

コンソール アプリケーションは、継続タスクの実行前に終了可能性がありますので、Wait()メソッドを呼び出して、継続は、例が終了する前に実行が完了したことを確認します。Because a console application may terminate before the continuation task executes, the Wait() method is called to ensure that the continuation finishes executing before the example ends.

たとえば、次を参照してください。を使用して継続タスクをタスクの連結します。For an additional example, see Chaining Tasks by Using Continuation Tasks.

注釈

返されたTaskはスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith(Action<Task>, TaskScheduler) ContinueWith(Action<Task>, TaskScheduler) ContinueWith(Action<Task>, TaskScheduler) ContinueWith(Action<Task>, TaskScheduler)

ターゲットの Task が完了したときに非同期に実行する継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes. 継続タスクは、指定されたスケジューラを使用します。The continuation uses a specified scheduler.

public:
 System::Threading::Tasks::Task ^ ContinueWith(Action<System::Threading::Tasks::Task ^> ^ continuationAction, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task ContinueWith (Action<System.Threading.Tasks.Task> continuationAction, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Action<System.Threading.Tasks.Task> * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task
Public Function ContinueWith (continuationAction As Action(Of Task), scheduler As TaskScheduler) As Task

パラメーター

continuationAction
Action<Task>

Task の完了時に実行するアクション。An action to run when the Task completes. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

新しい継続 TaskA new continuation Task.

例外

continuationAction 引数が null です。The continuationAction argument is null.

または-or- scheduler 引数が null です。The scheduler argument is null.

注釈

返されたTaskはスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskContinuationOptions)

対象の Task が完了したときに、指定したタスク継続オプションに基づいて実行される継続タスクを作成します。Creates a continuation that executes based on the specified task continuation options when the target Task completes. この継続タスクは、呼び出し元から提供される状態情報を受け取ります。The continuation receives caller-supplied state information.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, System::Object ^, TResult> ^ continuationFunction, System::Object ^ state, System::Threading::Tasks::TaskContinuationOptions continuationOptions);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,object,TResult> continuationFunction, object state, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
member this.ContinueWith : Func<System.Threading.Tasks.Task, obj, 'Result> * obj * System.Threading.Tasks.TaskContinuationOptions -> System.Threading.Tasks.Task<'Result>
Public Function ContinueWith(Of TResult) (continuationFunction As Func(Of Task, Object, TResult), state As Object, continuationOptions As TaskContinuationOptions) As Task(Of TResult)

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,Object,TResult>

Task の完了時に実行する関数。A function to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続関数によって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation function.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

戻り値

例外

continuationFunction 引数が null です。The continuationFunction argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

注釈

返されたTask<TResult>現在のタスクが完了するまで実行のスケジュールされません。The returned Task<TResult> will not be scheduled for execution until the current task has completed. を通じて、継続条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the continuation criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken, TaskContinuationOptions, TaskScheduler)

対象の Task が完了したときに、指定したタスク継続オプションに基づいて実行され、値を返す継続タスクを作成します。Creates a continuation that executes based on the specified task continuation options when the target Task completes and returns a value. この継続タスクは、呼び出し元から提供される状態情報とキャンセル トークンを受け取り、指定したスケジューラを使用します。The continuation receives caller-supplied state information and a cancellation token and uses the specified scheduler.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, System::Object ^, TResult> ^ continuationFunction, System::Object ^ state, System::Threading::CancellationToken cancellationToken, System::Threading::Tasks::TaskContinuationOptions continuationOptions, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,object,TResult> continuationFunction, object state, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Func<System.Threading.Tasks.Task, obj, 'Result> * obj * System.Threading.CancellationToken * System.Threading.Tasks.TaskContinuationOptions * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task<'Result>

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,Object,TResult>

Task の完了時に実行する関数。A function to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続関数によって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation function.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

例外

scheduler 引数が null です。The scheduler argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

指定された CancellationToken は既に破棄されています。The provided CancellationToken has already been disposed.

注釈

返されたTask<TResult>現在のタスクが完了するまで実行のスケジュールされません。The returned Task<TResult> will not be scheduled for execution until the current task has completed. 使用条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith<TResult>(Func<Task,TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

指定された継続のオプションに従って実行され、値を返す継続タスクを作成します。Creates a continuation that executes according to the specified continuation options and returns a value. 継続タスクは、キャンセル トークンを渡され、指定されたスケジューラを使用します。The continuation is passed a cancellation token and uses a specified scheduler.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, TResult> ^ continuationFunction, System::Threading::CancellationToken cancellationToken, System::Threading::Tasks::TaskContinuationOptions continuationOptions, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,TResult> continuationFunction, System.Threading.CancellationToken cancellationToken, System.Threading.Tasks.TaskContinuationOptions continuationOptions, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Func<System.Threading.Tasks.Task, 'Result> * System.Threading.CancellationToken * System.Threading.Tasks.TaskContinuationOptions * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task<'Result>

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,TResult>

指定した continuationOptions に従って実行する関数。A function to run according to the specified continuationOptions. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

例外

Task は破棄されています。The Task has been disposed.

または-or- トークンを作成した CancellationTokenSource は、既に破棄されています。The CancellationTokenSource that created the token has already been disposed.

continuationFunction 引数が null です。The continuationFunction argument is null.

または-or- scheduler 引数が null です。The scheduler argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

次の例では、継続のオプションでの ContinueWith メソッドを使用する方法を示します。The following example shows how to use the ContinueWith method with continuation options:

using System;
using System.Threading;
using System.Threading.Tasks;

class ContinuationOptionsDemo
{
    // Demonstrated features:
    //      TaskContinuationOptions
    //		Task.ContinueWith()
    // 		Task.Factory
    //		Task.Wait()
    // Expected results:
    // 		This sample demonstrates branched continuation sequences - Task+Commit or Task+Rollback.
    //      Notice that no if statements are used.
    //		The first sequence is successful - tran1 and commitTran1 are executed. rollbackTran1 is canceled.
    //		The second sequence is unsuccessful - tran2 and rollbackTran2 are executed. tran2 is faulted, and commitTran2 is canceled.
    // Documentation:
    //		http://msdn.microsoft.com/library/system.threading.tasks.taskcontinuationoptions(VS.100).aspx
    static void Main()
    {
        Action success = () => Console.WriteLine("Task={0}, Thread={1}: Begin successful transaction",
                                                Task.CurrentId, Thread.CurrentThread.ManagedThreadId);
        Action failure = () =>
        {
            Console.WriteLine("Task={0}, Thread={1}: Begin transaction and encounter an error",
                                Task.CurrentId, Thread.CurrentThread.ManagedThreadId);
            throw new InvalidOperationException("SIMULATED EXCEPTION");
        };

        Action<Task> commit = (antecendent) => Console.WriteLine("Task={0}, Thread={1}: Commit transaction",
                                                                Task.CurrentId, Thread.CurrentThread.ManagedThreadId);
        Action<Task> rollback = (antecendent) =>
        {
            // "Observe" your antecedent's exception so as to avoid an exception
            // being thrown on the finalizer thread
            var unused = antecendent.Exception;

            Console.WriteLine("Task={0}, Thread={1}: Rollback transaction",
                  Task.CurrentId, Thread.CurrentThread.ManagedThreadId);
        };

        // Successful transaction - Begin + Commit
        Console.WriteLine("Demonstrating a successful transaction");

        // Initial task
        // Treated as "fire-and-forget" -- any exceptions will be cleaned up in rollback continuation
        Task tran1 = Task.Factory.StartNew(success);

        // The following task gets scheduled only if tran1 completes successfully
        var commitTran1 = tran1.ContinueWith(commit, TaskContinuationOptions.OnlyOnRanToCompletion);

        // The following task gets scheduled only if tran1 DOES NOT complete successfully
        var rollbackTran1 = tran1.ContinueWith(rollback, TaskContinuationOptions.NotOnRanToCompletion);

        // For demo purposes, wait for the sample to complete
        commitTran1.Wait();

        // -----------------------------------------------------------------------------------


        // Failed transaction - Begin + exception + Rollback
        Console.WriteLine("\nDemonstrating a failed transaction");

        // Initial task
        // Treated as "fire-and-forget" -- any exceptions will be cleaned up in rollback continuation
        Task tran2 = Task.Factory.StartNew(failure);

        // The following task gets scheduled only if tran2 completes successfully
        var commitTran2 = tran2.ContinueWith(commit, TaskContinuationOptions.OnlyOnRanToCompletion);

        // The following task gets scheduled only if tran2 DOES NOT complete successfully
        var rollbackTran2 = tran2.ContinueWith(rollback, TaskContinuationOptions.NotOnRanToCompletion);

        // For demo purposes, wait for the sample to complete
        rollbackTran2.Wait();
    }

}
Imports System.Threading
Imports System.Threading.Tasks
Module ContuationOptionsDemo
    ' Demonstrated features:
    '   TaskContinuationOptions
    '   Task.ContinueWith()
    '   Task.Factory
    '   Task.Wait()
    ' Expected results:
    '   This sample demonstrates branched continuation sequences - Task+Commit or Task+Rollback.
    '   Notice that no if statements are used.
    '   The first sequence is successful - tran1 and commitTran1 are executed. rollbackTran1 is canceled.
    '   The second sequence is unsuccessful - tran2 and rollbackTran2 are executed. tran2 is faulted, and commitTran2 is canceled.
    ' Documentation:
    '   http://msdn.microsoft.com/library/system.threading.tasks.taskcontinuationoptions(VS.100).aspx
    Private Sub Main()
        Dim success As Action = Sub()
                                    Console.WriteLine("Task={0}, Thread={1}: Begin successful transaction", Task.CurrentId, Thread.CurrentThread.ManagedThreadId)
                                End Sub

        Dim failure As Action = Sub()
                                    Console.WriteLine("Task={0}, Thread={1}: Begin transaction and encounter an error", Task.CurrentId, Thread.CurrentThread.ManagedThreadId)
                                    Throw New InvalidOperationException("SIMULATED EXCEPTION")
                                End Sub

        Dim commit As Action(Of Task) = Sub(antecendent)
                                            Console.WriteLine("Task={0}, Thread={1}: Commit transaction", Task.CurrentId, Thread.CurrentThread.ManagedThreadId)
                                        End Sub

        Dim rollback As Action(Of Task) = Sub(antecendent)
                                              ' "Observe" your antecedent's exception so as to avoid an exception
                                              ' being thrown on the finalizer thread
                                              Dim unused = antecendent.Exception

                                              Console.WriteLine("Task={0}, Thread={1}: Rollback transaction", Task.CurrentId, Thread.CurrentThread.ManagedThreadId)
                                          End Sub

        ' Successful transaction - Begin + Commit
        Console.WriteLine("Demonstrating a successful transaction")

        ' Initial task
        ' Treated as "fire-and-forget" -- any exceptions will be cleaned up in rollback continuation
        Dim tran1 As Task = Task.Factory.StartNew(success)

        ' The following task gets scheduled only if tran1 completes successfully
        Dim commitTran1 = tran1.ContinueWith(commit, TaskContinuationOptions.OnlyOnRanToCompletion)

        ' The following task gets scheduled only if tran1 DOES NOT complete successfully
        Dim rollbackTran1 = tran1.ContinueWith(rollback, TaskContinuationOptions.NotOnRanToCompletion)

        ' For demo purposes, wait for the sample to complete
        commitTran1.Wait()

        ' -----------------------------------------------------------------------------------


        ' Failed transaction - Begin + exception + Rollback 
        Console.WriteLine(vbLf & "Demonstrating a failed transaction")

        ' Initial task
        ' Treated as "fire-and-forget" -- any exceptions will be cleaned up in rollback continuation
        Dim tran2 As Task = Task.Factory.StartNew(failure)

        ' The following task gets scheduled only if tran2 completes successfully
        Dim commitTran2 = tran2.ContinueWith(commit, TaskContinuationOptions.OnlyOnRanToCompletion)

        ' The following task gets scheduled only if tran2 DOES NOT complete successfully
        Dim rollbackTran2 = tran2.ContinueWith(rollback, TaskContinuationOptions.NotOnRanToCompletion)

        ' For demo purposes, wait for the sample to complete
        rollbackTran2.Wait()
    End Sub
End Module

注釈

返されたTask<TResult>現在のタスクが完了するまで実行のスケジュールされません。The returned Task<TResult> will not be scheduled for execution until the current task has completed. 使用条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, TaskScheduler)

ターゲットの Task が完了したときに非同期に実行する継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes. この継続タスクは、呼び出し元から提供される状態情報を受け取り、指定したスケジューラを使用します。The continuation receives caller-supplied state information and uses a specified scheduler.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, System::Object ^, TResult> ^ continuationFunction, System::Object ^ state, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,object,TResult> continuationFunction, object state, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Func<System.Threading.Tasks.Task, obj, 'Result> * obj * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task<'Result>
Public Function ContinueWith(Of TResult) (continuationFunction As Func(Of Task, Object, TResult), state As Object, scheduler As TaskScheduler) As Task(Of TResult)

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,Object,TResult>

Task の完了時に実行する関数。A function to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続関数によって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation function.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

例外

scheduler 引数が null です。The scheduler argument is null.

注釈

返されたTask<TResult>はスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task<TResult> will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken) ContinueWith<TResult>(Func<Task,Object,TResult>, Object, CancellationToken)

対象の Task が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes and returns a value. この継続タスクは、呼び出し元から提供される状態情報とキャンセル トークンを受け取ります。The continuation receives caller-supplied state information and a cancellation token.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, System::Object ^, TResult> ^ continuationFunction, System::Object ^ state, System::Threading::CancellationToken cancellationToken);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,object,TResult> continuationFunction, object state, System.Threading.CancellationToken cancellationToken);
member this.ContinueWith : Func<System.Threading.Tasks.Task, obj, 'Result> * obj * System.Threading.CancellationToken -> System.Threading.Tasks.Task<'Result>

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,Object,TResult>

Task の完了時に実行する関数。A function to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続関数によって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation function.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

戻り値

例外

continuationFunction 引数が null です。The continuationFunction argument is null.

指定された CancellationToken は既に破棄されています。The provided CancellationToken has already been disposed.

注釈

返されたTask<TResult>はスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task<TResult> will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith<TResult>(Func<Task,Object,TResult>, Object) ContinueWith<TResult>(Func<Task,Object,TResult>, Object) ContinueWith<TResult>(Func<Task,Object,TResult>, Object) ContinueWith<TResult>(Func<Task,Object,TResult>, Object)

呼び出し元から提供される状態情報を受け取り、対象の Task が完了したときに非同期的に実行され、値を返す継続タスクを作成します。Creates a continuation that receives caller-supplied state information and executes asynchronously when the target Task completes and returns a value.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, System::Object ^, TResult> ^ continuationFunction, System::Object ^ state);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,object,TResult> continuationFunction, object state);
member this.ContinueWith : Func<System.Threading.Tasks.Task, obj, 'Result> * obj -> System.Threading.Tasks.Task<'Result>
Public Function ContinueWith(Of TResult) (continuationFunction As Func(Of Task, Object, TResult), state As Object) As Task(Of TResult)

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,Object,TResult>

Task の完了時に実行する関数。A function to run when the Task completes. 実行すると、完了したタスクおよび呼び出し元が指定する状態オブジェクトがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

継続関数によって使用されるデータを表すオブジェクト。An object representing data to be used by the continuation function.

戻り値

例外

continuationFunction 引数が null です。The continuationFunction argument is null.

注釈

返されたTask<TResult>はスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task<TResult> will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions) ContinueWith<TResult>(Func<Task,TResult>, TaskContinuationOptions)

指定された継続のオプションに従って実行され、値を返す継続タスクを作成します。Creates a continuation that executes according to the specified continuation options and returns a value.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, TResult> ^ continuationFunction, System::Threading::Tasks::TaskContinuationOptions continuationOptions);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,TResult> continuationFunction, System.Threading.Tasks.TaskContinuationOptions continuationOptions);
member this.ContinueWith : Func<System.Threading.Tasks.Task, 'Result> * System.Threading.Tasks.TaskContinuationOptions -> System.Threading.Tasks.Task<'Result>
Public Function ContinueWith(Of TResult) (continuationFunction As Func(Of Task, TResult), continuationOptions As TaskContinuationOptions) As Task(Of TResult)

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,TResult>

continuationOptions で指定した条件に従って実行する関数。A function to run according to the condition specified in continuationOptions. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

継続タスクのスケジュールおよびその動作を設定するオプション。Options for when the continuation is scheduled and how it behaves. これには、OnlyOnCanceled などの基準および ExecuteSynchronously などの実行オプションが含まれます。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

戻り値

例外

continuationFunction 引数が null です。The continuationFunction argument is null.

continuationOptions 引数が、TaskContinuationOptions の無効な値を指定しています。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

注釈

返されたTask<TResult>現在のタスクが完了するまで実行のスケジュールされません。The returned Task<TResult> will not be scheduled for execution until the current task has completed. を通じて、継続条件が指定されている場合、continuationOptionsパラメーターが満たされていない、継続タスクは取り消されますの代わりにスケジュールします。If the continuation criteria specified through the continuationOptions parameter are not met, the continuation task will be canceled instead of scheduled.

ContinueWith<TResult>(Func<Task,TResult>, CancellationToken) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken) ContinueWith<TResult>(Func<Task,TResult>, CancellationToken)

対象の Task が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes and returns a value. この継続タスクは、キャンセル トークンを受け取ります。The continuation receives a cancellation token.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, TResult> ^ continuationFunction, System::Threading::CancellationToken cancellationToken);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,TResult> continuationFunction, System.Threading.CancellationToken cancellationToken);
member this.ContinueWith : Func<System.Threading.Tasks.Task, 'Result> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<'Result>

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,TResult>

Task の完了時に実行する関数。A function to run when the Task completes. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

新しい継続タスクに割り当てられる CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

戻り値

例外

Task は破棄されています。The Task has been disposed.

- または --or- トークンを作成した CancellationTokenSource は、既に破棄されています。The CancellationTokenSource that created the token has already been disposed.

continuationFunction 引数が null です。The continuationFunction argument is null.

注釈

返されたTask<TResult>はスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task<TResult> will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith<TResult>(Func<Task,TResult>) ContinueWith<TResult>(Func<Task,TResult>) ContinueWith<TResult>(Func<Task,TResult>) ContinueWith<TResult>(Func<Task,TResult>)

対象の Task<TResult> が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task<TResult> completes and returns a value.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, TResult> ^ continuationFunction);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,TResult> continuationFunction);
member this.ContinueWith : Func<System.Threading.Tasks.Task, 'Result> -> System.Threading.Tasks.Task<'Result>
Public Function ContinueWith(Of TResult) (continuationFunction As Func(Of Task, TResult)) As Task(Of TResult)

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,TResult>

Task<TResult> の完了時に実行する関数。A function to run when the Task<TResult> completes. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

戻り値

新しい継続タスク。A new continuation task.

例外

continuationFunction 引数が null です。The continuationFunction argument is null.

次の例では、ContinueWith メソッドを使用する方法を示します。The following example shows how to use the ContinueWith method:

using System;
using System.Threading;
using System.Threading.Tasks;

class ContinuationSimpleDemo
{
    // Demonstrated features:
    // 		Task.Factory
    //		Task.ContinueWith()
    //		Task.Wait()
    // Expected results:
    // 		A sequence of three unrelated tasks is created and executed in this order - alpha, beta, gamma.
    //		A sequence of three related tasks is created - each task negates its argument and passes is to the next task: 5, -5, 5 is printed.
    //		A sequence of three unrelated tasks is created where tasks have different types.
    // Documentation:
    //		http://msdn.microsoft.com/library/system.threading.tasks.taskfactory_members(VS.100).aspx
    static void Main()
    {
        Action<string> action =
            (str) =>
                Console.WriteLine("Task={0}, str={1}, Thread={2}", Task.CurrentId, str, Thread.CurrentThread.ManagedThreadId);

        // Creating a sequence of action tasks (that return no result).
        Console.WriteLine("Creating a sequence of action tasks (that return no result)");
        Task.Factory.StartNew(() => action("alpha"))
            .ContinueWith(antecendent => action("beta"))        // Antecedent data is ignored
            .ContinueWith(antecendent => action("gamma"))
            .Wait();


        Func<int, int> negate =
            (n) =>
            {
                Console.WriteLine("Task={0}, n={1}, -n={2}, Thread={3}", Task.CurrentId, n, -n, Thread.CurrentThread.ManagedThreadId);
                return -n;
            };

        // Creating a sequence of function tasks where each continuation uses the result from its antecendent
        Console.WriteLine("\nCreating a sequence of function tasks where each continuation uses the result from its antecendent");
        Task<int>.Factory.StartNew(() => negate(5))
            .ContinueWith(antecendent => negate(antecendent.Result))		// Antecedent result feeds into continuation
            .ContinueWith(antecendent => negate(antecendent.Result))
            .Wait();


        // Creating a sequence of tasks where you can mix and match the types
        Console.WriteLine("\nCreating a sequence of tasks where you can mix and match the types");
        Task<int>.Factory.StartNew(() => negate(6))
            .ContinueWith(antecendent => action("x"))
            .ContinueWith(antecendent => negate(7))
            .Wait();
    }
}
Imports System.Threading
Imports System.Threading.Tasks

Module ContinuationDemo

    ' Demonstrated features:
    '   Task.Factory
    '   Task.ContinueWith()
    '   Task.Wait()
    ' Expected results:
    '   A sequence of three unrelated tasks is created and executed in this order - alpha, beta, gamma.
    '   A sequence of three related tasks is created - each task negates its argument and passes is to the next task: 5, -5, 5 is printed.
    '   A sequence of three unrelated tasks is created where tasks have different types.
    ' Documentation:
    '   http://msdn.microsoft.com/library/system.threading.tasks.taskfactory_members(VS.100).aspx
    Sub Main()
        Dim action As Action(Of String) = Sub(str) Console.WriteLine("Task={0}, str={1}, Thread={2}", Task.CurrentId, str, Thread.CurrentThread.ManagedThreadId)

        ' Creating a sequence of action tasks (that return no result).
        Console.WriteLine("Creating a sequence of action tasks (that return no result)")
        ' Continuations ignore antecedent data
        Task.Factory.StartNew(Sub() action("alpha")).ContinueWith(Sub(antecendent) action("beta")).ContinueWith(Sub(antecendent) action("gamma")).Wait()


        Dim negate As Func(Of Integer, Integer) = Function(n)
                                                      Console.WriteLine("Task={0}, n={1}, -n={2}, Thread={3}", Task.CurrentId, n, -n, Thread.CurrentThread.ManagedThreadId)
                                                      Return -n
                                                  End Function

        ' Creating a sequence of function tasks where each continuation uses the result from its antecendent
        Console.WriteLine(vbLf & "Creating a sequence of function tasks where each continuation uses the result from its antecendent")
        Task(Of Integer).Factory.StartNew(Function() negate(5)).ContinueWith(Function(antecendent) negate(antecendent.Result)).ContinueWith(Function(antecendent) negate(antecendent.Result)).Wait()


        ' Creating a sequence of tasks where you can mix and match the types
        Console.WriteLine(vbLf & "Creating a sequence of tasks where you can mix and match the types")
        Task(Of Integer).Factory.StartNew(Function() negate(6)).ContinueWith(Sub(antecendent) action("x")).ContinueWith(Function(antecendent) negate(7)).Wait()
    End Sub
End Module

注釈

返されたTask<TResult>はスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task<TResult> will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler) ContinueWith<TResult>(Func<Task,TResult>, TaskScheduler)

対象の Task が完了して値を返したときに非同期的に実行される継続タスクを作成します。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 継続タスクは、指定されたスケジューラを使用します。The continuation uses a specified scheduler.

public:
generic <typename TResult>
 System::Threading::Tasks::Task<TResult> ^ ContinueWith(Func<System::Threading::Tasks::Task ^, TResult> ^ continuationFunction, System::Threading::Tasks::TaskScheduler ^ scheduler);
public System.Threading.Tasks.Task<TResult> ContinueWith<TResult> (Func<System.Threading.Tasks.Task,TResult> continuationFunction, System.Threading.Tasks.TaskScheduler scheduler);
member this.ContinueWith : Func<System.Threading.Tasks.Task, 'Result> * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task<'Result>
Public Function ContinueWith(Of TResult) (continuationFunction As Func(Of Task, TResult), scheduler As TaskScheduler) As Task(Of TResult)

型パラメーター

TResult

継続タスクによって生成される結果の型。The type of the result produced by the continuation.

パラメーター

continuationFunction
Func<Task,TResult>

Task の完了時に実行する関数。A function to run when the Task completes. 実行すると、完了したタスクがデリゲートの引数として渡されます。When run, the delegate will be passed the completed task as an argument.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

継続タスクに関連付け、それを実行するために使用する TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

戻り値

例外

continuationFunction 引数が null です。The continuationFunction argument is null.

- または --or- scheduler 引数が null です。The scheduler argument is null.

注釈

返されたTask<TResult>はスケジュールされません実行の現在のタスクが完了するまで正常に完了するまで実行されて、ハンドルされない例外、エラー、または取り消されることによって早い段階を終了によって完了するかどうか。The returned Task<TResult> will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

適用対象