TaskStatus TaskStatus TaskStatus TaskStatus Enum

Определение

Представляет текущий этап жизненного цикла задачи Task.Represents the current stage in the lifecycle of a Task.

public enum class TaskStatus
public enum TaskStatus
type TaskStatus = 
Public Enum TaskStatus
Наследование

Поля

Canceled Canceled Canceled Canceled 6

Задача приняла отмену, создав исключение OperationCanceledException с собственным токеном CancellationToken, пока он находился в состоянии получения сигнала, или токен CancellationToken задачи уже получил сигнал до начала выполнения задачи.The task acknowledged cancellation by throwing an OperationCanceledException with its own CancellationToken while the token was in signaled state, or the task's CancellationToken was already signaled before the task started executing. Дополнительные сведения см. в разделе Отмена задач.For more information, see Task Cancellation.

Created Created Created Created 0

Задача инициализирована, но еще не запланирована.The task has been initialized but has not yet been scheduled.

Faulted Faulted Faulted Faulted 7

Задача завершилась из-за необработанного исключения.The task completed due to an unhandled exception.

RanToCompletion RanToCompletion RanToCompletion RanToCompletion 5

Задача успешно завершена.The task completed execution successfully.

Running Running Running Running 3

Задача выполняется, но еще не завершилась.The task is running but has not yet completed.

WaitingForActivation WaitingForActivation WaitingForActivation WaitingForActivation 1

Задача ожидает активации и внутреннего планирования инфраструктурой платформы .NET Framework.The task is waiting to be activated and scheduled internally by the .NET Framework infrastructure.

WaitingForChildrenToComplete WaitingForChildrenToComplete WaitingForChildrenToComplete WaitingForChildrenToComplete 4

Задача закончила выполнение и неявно ожидает завершения присоединенных к ней дочерних задач.The task has finished executing and is implicitly waiting for attached child tasks to complete.

WaitingToRun WaitingToRun WaitingToRun WaitingToRun 2

Задача запланирована для выполнения, но еще не начала выполняться.The task has been scheduled for execution but has not yet begun executing.

Примеры

В следующем примере создается 20 задач, которые будут циклически выполняться до тех пор, пока значение счетчика не увеличится до значения 2 000 000.The following example creates 20 tasks that will loop until a counter is incremented to a value of 2 million. Когда первые 10 задач достигли 2 000 000, маркер отмены отменяется, и все задачи, счетчики которых не достигли 2 000 000, отменяются.When the first 10 tasks reach 2 million, the cancellation token is cancelled, and any tasks whose counters have not reached 2 million are cancelled. Затем в примере проверяется Task.Status свойство каждой задачи, чтобы указать, была ли задача успешно завершена или отменена.The example then examines the Task.Status property of each task to indicate whether the task has completed successfully or been cancelled. Для тех, которые завершились, отображается значение, возвращаемое задачей.For those that have completed, it displays the value returned by the task.

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

public class Example
{
   public static void Main()
   {
      var tasks = new List<Task<int>>();
      var source = new CancellationTokenSource();
      var token = source.Token;
      int completedIterations = 0;

      for (int n = 0; n <= 19; n++)
         tasks.Add(Task.Run( () => { int iterations = 0;
                                     for (int ctr = 1; ctr <= 2000000; ctr++) {
                                         token.ThrowIfCancellationRequested();
                                         iterations++;
                                     }
                                     Interlocked.Increment(ref completedIterations);
                                     if (completedIterations >= 10)
                                        source.Cancel();
                                     return iterations; }, token));

      Console.WriteLine("Waiting for the first 10 tasks to complete...\n");
      try  {
         Task.WaitAll(tasks.ToArray());
      }
      catch (AggregateException) {
         Console.WriteLine("Status of tasks:\n");
         Console.WriteLine("{0,10} {1,20} {2,14:N0}", "Task Id",
                           "Status", "Iterations");
         foreach (var t in tasks)
            Console.WriteLine("{0,10} {1,20} {2,14}",
                              t.Id, t.Status,
                              t.Status != TaskStatus.Canceled ? t.Result.ToString("N0") : "n/a");
      }
   }
}
// The example displays output like the following:
//    Waiting for the first 10 tasks to complete...
//    Status of tasks:
//
//       Task Id               Status     Iterations
//             1      RanToCompletion      2,000,000
//             2      RanToCompletion      2,000,000
//             3      RanToCompletion      2,000,000
//             4      RanToCompletion      2,000,000
//             5      RanToCompletion      2,000,000
//             6      RanToCompletion      2,000,000
//             7      RanToCompletion      2,000,000
//             8      RanToCompletion      2,000,000
//             9      RanToCompletion      2,000,000
//            10             Canceled            n/a
//            11             Canceled            n/a
//            12             Canceled            n/a
//            13             Canceled            n/a
//            14             Canceled            n/a
//            15             Canceled            n/a
//            16      RanToCompletion      2,000,000
//            17             Canceled            n/a
//            18             Canceled            n/a
//            19             Canceled            n/a
//            20             Canceled            n/a
Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks

Module Example

   Public Sub Main()
      Dim tasks As New List(Of Task(Of Integer))()
      Dim source As New CancellationTokenSource
      Dim token As CancellationToken = source.Token
      Dim completedIterations As Integer = 0
      
      For n As Integer = 0 To 19
         tasks.Add(Task.Run( Function()
                                Dim iterations As Integer= 0
                                For ctr As Long = 1 To 2000000
                                   token.ThrowIfCancellationRequested()
                                   iterations += 1
                                Next
                                Interlocked.Increment(completedIterations)
                                If completedIterations >= 10 Then source.Cancel()
                                Return iterations
                             End Function, token))
      Next

      Console.WriteLine("Waiting for the first 10 tasks to complete... ")
      Try
         Task.WaitAll(tasks.ToArray())
      Catch e As AggregateException
         Console.WriteLine("Status of tasks:")
         Console.WriteLine()
         Console.WriteLine("{0,10} {1,20} {2,14}", "Task Id",
                           "Status", "Iterations")
         For Each t In tasks
            Console.WriteLine("{0,10} {1,20} {2,14}",
                              t.Id, t.Status,
                              If(t.Status <> TaskStatus.Canceled,
                                 t.Result.ToString("N0"), "n/a"))
         Next
      End Try
   End Sub
End Module
' The example displays output like the following:
'    Waiting for the first 10 tasks to complete...
'    Status of tasks:
'
'       Task Id               Status     Iterations
'             1      RanToCompletion      2,000,000
'             2      RanToCompletion      2,000,000
'             3      RanToCompletion      2,000,000
'             4      RanToCompletion      2,000,000
'             5      RanToCompletion      2,000,000
'             6      RanToCompletion      2,000,000
'             7      RanToCompletion      2,000,000
'             8      RanToCompletion      2,000,000
'             9      RanToCompletion      2,000,000
'            10             Canceled            n/a
'            11             Canceled            n/a
'            12             Canceled            n/a
'            13             Canceled            n/a
'            14             Canceled            n/a
'            15             Canceled            n/a
'            16      RanToCompletion      2,000,000
'            17             Canceled            n/a
'            18             Canceled            n/a
'            19             Canceled            n/a
'            20             Canceled            n/a

Комментарии

Свойство возвращает элемент TaskStatus перечисления, чтобы указать текущее состояние задачи. Task.StatusThe Task.Status property returns a member of the TaskStatus enumeration to indicate the task's current status.

Применяется к

Дополнительно