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

定義

建立當目標 Task 完成時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes.

多載

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

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊和取消語彙基元,並執行的接續。Creates a continuation that receives caller-supplied state information and a cancellation token and that executes when the target Task completes. 接續會根據一組指定的條件執行,並使用指定的排程器。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)

建立當目標工作完成時,會根據指定之 TaskContinuationOptions 執行的接續。Creates a continuation that executes when the target task competes according to the specified TaskContinuationOptions. 接續會接收取消語彙基元,並使用指定的排程器。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊並非同步執行的接續。Creates a continuation that receives caller-supplied state information and executes asynchronously when the target Task completes. 接續會使用指定的排程器。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊並執行的接續。Creates a continuation that receives caller-supplied state information and executes when the target Task completes. 接續會根據一組指定的條件執行。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊和取消語彙基元,並非同步執行的接續。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊並執行的接續。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)

建立當目標工作完成時,會根據指定之 TaskContinuationOptions 執行的接續。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)

建立當目標 Task 完成時,會接收取消語彙基元並非同步執行的接續。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>)

建立當目標 Task 完成時非同步執行的接續。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)

建立當目標 Task 完成時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes. 接續會使用指定的排程器。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)

建立當目標 Task 完成時,會根據指定的工作接續選項來執行的接續。Creates a continuation that executes based on the specified task continuation options when the target Task completes. 接續會接收呼叫端提供的狀態資訊。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)

建立當目標 Task 完成並傳回值時,會根據指定的工作接續選項來執行的接續。Creates a continuation that executes based on the specified task continuation options when the target Task completes and returns a value. 接續會接收呼叫端提供的狀態資訊和取消語彙基元,並使用指定的排程器。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)

建立會根據指定之接續選項執行並傳回值的接續。Creates a continuation that executes according to the specified continuation options and returns a value. 接續會接收取消語彙基元,並使用指定的排程器。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)

建立當目標 Task 完成時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes. 接續會接收呼叫端提供的狀態資訊,並使用指定的排程器。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)

建立當目標 Task 完成並傳回值時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 接續會接收呼叫端提供的狀態資訊和取消語彙基元。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)

建立當目標 Task 完成並傳回值時,會接收呼叫端提供的狀態資訊並非同步執行的接續。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)

建立會根據指定之接續選項執行並傳回值的接續。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)

建立當目標 Task 完成並傳回值時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 接續會接收取消語彙基元。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>)

建立當目標 Task<TResult> 完成並傳回值時非同步執行的接續。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)

建立當目標 Task 完成並傳回值時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 接續會使用指定的排程器。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊和取消語彙基元,並執行的接續。Creates a continuation that receives caller-supplied state information and a cancellation token and that executes when the target Task completes. 接續會根據一組指定的條件執行,並使用指定的排程器。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

參數

continuationAction
Action<Task,Object>

Task 完成時要執行的動作。An action to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續動作所使用的資料。An object representing data to be used by the continuation action.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

新的接續 TaskA new continuation Task.

例外狀況

scheduler 引數為 nullThe scheduler argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止。The returned Task will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的準則,將會取消接續工作,而不是排程。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)

建立當目標工作完成時,會根據指定之 TaskContinuationOptions 執行的接續。Creates a continuation that executes when the target task competes according to the specified TaskContinuationOptions. 接續會接收取消語彙基元,並使用指定的排程器。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

參數

continuationAction
Action<Task>

要根據指定的 continuationOptions 執行的動作。An action to run according to the specified continuationOptions. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

新的接續 TaskA new continuation Task.

例外狀況

已處置建立語彙基元的 CancellationTokenSourceThe CancellationTokenSource that created the token has already been disposed.

continuationAction 引數為 null。The continuationAction argument is null.

-或--or- scheduler 引數為 null。The scheduler argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

範例

以下是使用 System.threading.tasks.task.continuewith 在背景和使用者介面執行緒上執行工作的範例。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  
  

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止。The returned Task will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的準則,將會取消接續工作,而不是排程。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊並非同步執行的接續。Creates a continuation that receives caller-supplied state information and executes asynchronously when the target Task completes. 接續會使用指定的排程器。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

參數

continuationAction
Action<Task,Object>

Task 完成時要執行的動作。An action to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續動作所使用的資料。An object representing data to be used by the continuation action.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

新的接續 TaskA new continuation Task.

例外狀況

scheduler 引數為 nullThe scheduler argument is null.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊並執行的接續。Creates a continuation that receives caller-supplied state information and executes when the target Task completes. 接續會根據一組指定的條件執行。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

參數

continuationAction
Action<Task,Object>

Task 完成時要執行的動作。An action to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續動作所使用的資料。An object representing data to be used by the continuation action.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

傳回

新的接續 TaskA new continuation Task.

例外狀況

continuationAction 引數為 nullThe continuationAction argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止。The returned Task will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的接續準則,將會取消接續工作,而不是排程。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊和取消語彙基元,並非同步執行的接續。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

參數

continuationAction
Action<Task,Object>

Task 完成時要執行的動作。An action to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續動作所使用的資料。An object representing data to be used by the continuation action.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

傳回

新的接續 TaskA new continuation Task.

例外狀況

continuationAction 引數為 nullThe continuationAction argument is null.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標 Task 完成時,會接收呼叫端提供的狀態資訊並執行的接續。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

參數

continuationAction
Action<Task,Object>

當工作完成時要執行的動作。An action to run when the task completes. 執行時,會將已完成的工作和呼叫端提供的狀態物件當做引數傳遞給委派。When run, the delegate is passed the completed task and a caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續動作所使用的資料。An object representing data to be used by the continuation action.

傳回

新的接續工作。A new continuation task.

例外狀況

continuationAction 引數為 nullThe continuationAction argument is null.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標工作完成時,會根據指定之 TaskContinuationOptions 執行的接續。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

參數

continuationAction
Action<Task>

要根據指定的 continuationOptions 執行的動作。An action to run according to the specified continuationOptions. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

傳回

新的接續 TaskA new continuation Task.

例外狀況

continuationAction 引數為 null。The continuationAction argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

範例

下列範例示範如何使用 TaskContinuationOptions 來指定當 antecedent 工作完成時,應該同步執行接續工作。The following example demonstrates using TaskContinuationOptions to specify that a continuation task should run synchronously when the antecedent task completes. (如果指定的工作已經在呼叫 ContinueWith 時完成,則同步接續會在呼叫 ContinueWith 的執行緒上執行)。(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  
  

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止。The returned Task will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的接續準則,將會取消接續工作,而不是排程。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)

建立當目標 Task 完成時,會接收取消語彙基元並非同步執行的接續。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

參數

continuationAction
Action<Task>

Task 完成時要執行的動作。An action to run when the Task completes. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

傳回

新的接續 TaskA new continuation Task.

例外狀況

已處置建立語彙基元的 CancellationTokenSourceThe CancellationTokenSource that created the token has already been disposed.

continuationAction 引數為 null。The continuationAction argument is null.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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>)

建立當目標 Task 完成時非同步執行的接續。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

參數

continuationAction
Action<Task>

Task 完成時要執行的動作。An action to run when the Task completes. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

傳回

新的接續 TaskA new continuation Task.

例外狀況

continuationAction 引數為 nullThe continuationAction argument is null.

範例

下列範例會定義使用100隨機日期和時間值來填入陣列的工作。The following example defines a task that populates an array with 100 random date and time values. 當陣列完全填入後,它會使用 ContinueWith(Action<Task>) 方法來選取最早和最新的日期值。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

因為主控台應用程式可能會在接續工作執行之前終止,所以會呼叫 Wait() 方法,以確保接續在範例結束之前完成執行。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.

如需其他範例,請參閱使用接續工作來連結工作。For an additional example, see Chaining Tasks by Using Continuation Tasks.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標 Task 完成時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes. 接續會使用指定的排程器。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

參數

continuationAction
Action<Task>

Task 完成時要執行的動作。An action to run when the Task completes. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

新的接續 TaskA new continuation Task.

例外狀況

continuationAction 引數為 nullThe continuationAction argument is null.

-或--or- scheduler 引數為 null。The scheduler argument is null.

備註

傳回的 Task 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標 Task 完成時,會根據指定的工作接續選項來執行的接續。Creates a continuation that executes based on the specified task continuation options when the target Task completes. 接續會接收呼叫端提供的狀態資訊。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)

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,Object,TResult>

Task 完成時要執行的函式。A function to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續函式所使用的資料。An object representing data to be used by the continuation function.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

傳回

例外狀況

continuationFunction 引數為 nullThe continuationFunction argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止。The returned Task<TResult> will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的接續準則,將會取消接續工作,而不是排程。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)

建立當目標 Task 完成並傳回值時,會根據指定的工作接續選項來執行的接續。Creates a continuation that executes based on the specified task continuation options when the target Task completes and returns a value. 接續會接收呼叫端提供的狀態資訊和取消語彙基元,並使用指定的排程器。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>

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,Object,TResult>

Task 完成時要執行的函式。A function to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續函式所使用的資料。An object representing data to be used by the continuation function.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

例外狀況

scheduler 引數為 nullThe scheduler argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止。The returned Task<TResult> will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的準則,將會取消接續工作,而不是排程。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)

建立會根據指定之接續選項執行並傳回值的接續。Creates a continuation that executes according to the specified continuation options and returns a value. 接續會接收取消語彙基元,並使用指定的排程器。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>

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,TResult>

要根據指定的 continuationOptions 執行的函式。A function to run according to the specified continuationOptions. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

例外狀況

Task 已經處置。The Task has been disposed.

-或--or- 已處置建立語彙基元的 CancellationTokenSourceThe CancellationTokenSource that created the token has already been disposed.

continuationFunction 引數為 null。The continuationFunction argument is null.

-或--or- scheduler 引數為 null。The scheduler argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

範例

下列範例顯示如何搭配使用 System.threading.tasks.task.continuewith 方法與接續選項: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

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止。The returned Task<TResult> will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的準則,將會取消接續工作,而不是排程。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)

建立當目標 Task 完成時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes. 接續會接收呼叫端提供的狀態資訊,並使用指定的排程器。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)

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,Object,TResult>

Task 完成時要執行的函式。A function to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續函式所使用的資料。An object representing data to be used by the continuation function.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

例外狀況

scheduler 引數為 nullThe scheduler argument is null.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標 Task 完成並傳回值時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 接續會接收呼叫端提供的狀態資訊和取消語彙基元。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>

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,Object,TResult>

Task 完成時要執行的函式。A function to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續函式所使用的資料。An object representing data to be used by the continuation function.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

傳回

例外狀況

continuationFunction 引數為 nullThe continuationFunction argument is null.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標 Task 完成並傳回值時,會接收呼叫端提供的狀態資訊並非同步執行的接續。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)

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,Object,TResult>

Task 完成時要執行的函式。A function to run when the Task completes. 當執行時,完成的工作會傳遞至委派,並以呼叫端提供狀態的物件做為引數。When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

state
Object Object Object Object

物件,表示接續函式所使用的資料。An object representing data to be used by the continuation function.

傳回

例外狀況

continuationFunction 引數為 nullThe continuationFunction argument is null.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立會根據指定之接續選項執行並傳回值的接續。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)

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,TResult>

要根據 continuationOptions 中指定之條件執行的函式。A function to run according to the condition specified in continuationOptions. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

continuationOptions
TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions TaskContinuationOptions

接續工作的排程時間及其行為方式的適用選項。Options for when the continuation is scheduled and how it behaves. 這包含準則 (如 OnlyOnCanceled) 和執行選項 (如 ExecuteSynchronously)。This includes criteria, such as OnlyOnCanceled, as well as execution options, such as ExecuteSynchronously.

傳回

例外狀況

continuationFunction 引數為 null。The continuationFunction argument is null.

continuationOptions 引數指定的 TaskContinuationOptions 值不正確。The continuationOptions argument specifies an invalid value for TaskContinuationOptions.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止。The returned Task<TResult> will not be scheduled for execution until the current task has completed. 如果不符合透過 continuationOptions 參數指定的接續準則,將會取消接續工作,而不是排程。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)

建立當目標 Task 完成並傳回值時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 接續會接收取消語彙基元。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>

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,TResult>

Task 完成時要執行的函式。A function to run when the Task completes. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

cancellationToken
CancellationToken CancellationToken CancellationToken CancellationToken

要指派給新接續工作的 CancellationTokenThe CancellationToken that will be assigned to the new continuation task.

傳回

例外狀況

Task 已經處置。The Task has been disposed.

-或--or- 已處置建立語彙基元的 CancellationTokenSourceThe CancellationTokenSource that created the token has already been disposed.

continuationFunction 引數為 null。The continuationFunction argument is null.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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>)

建立當目標 Task<TResult> 完成並傳回值時非同步執行的接續。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)

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,TResult>

Task<TResult> 完成時要執行的函式。A function to run when the Task<TResult> completes. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

傳回

新的接續工作。A new continuation task.

例外狀況

continuationFunction 引數為 null。The continuationFunction argument is null.

範例

下列範例顯示如何使用 System.threading.tasks.task.continuewith 方法: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

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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)

建立當目標 Task 完成並傳回值時非同步執行的接續。Creates a continuation that executes asynchronously when the target Task completes and returns a value. 接續會使用指定的排程器。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)

類型參數

TResult

接續作業所產生的結果類型。The type of the result produced by the continuation.

參數

continuationFunction
Func<Task,TResult>

Task 完成時要執行的函式。A function to run when the Task completes. 執行時,會將已完成的工作當做引數傳遞給委派。When run, the delegate will be passed the completed task as an argument.

scheduler
TaskScheduler TaskScheduler TaskScheduler TaskScheduler

要與接續工作產生關聯且於執行時使用的 TaskSchedulerThe TaskScheduler to associate with the continuation task and to use for its execution.

傳回

例外狀況

continuationFunction 引數為 null。The continuationFunction argument is null.

-或--or- scheduler 引數為 null。The scheduler argument is null.

備註

傳回的 Task<TResult> 將不會排程執行,直到目前的工作完成為止、是否因為已順利完成而完成、因未處理的例外狀況而發生錯誤,或是因為取消而提前結束為止。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.

適用於