Task.WaitAll 方法

定義

等待所有提供的 Task 物件完成執行。Waits for all of the provided Task objects to complete execution.

多載

WaitAll(Task[])

等候所有提供的 Task 物件完成執行。Waits for all of the provided Task objects to complete execution.

WaitAll(Task[], Int32)

等待所有提供的 Task 物件在指定的毫秒數內完成執行。Waits for all of the provided Task objects to complete execution within a specified number of milliseconds.

WaitAll(Task[], CancellationToken)

等候所有提供的 Task 物件完成執行。Waits for all of the provided Task objects to complete execution unless the wait is cancelled.

WaitAll(Task[], TimeSpan)

等候所有提供的可取消 Task 物件在指定的時間間隔內完成執行。Waits for all of the provided cancellable Task objects to complete execution within a specified time interval.

WaitAll(Task[], Int32, CancellationToken)

等待所有提供的 Task 物件在指定的毫秒數內完成執行。Waits for all of the provided Task objects to complete execution within a specified number of milliseconds or until the wait is cancelled.

WaitAll(Task[])

等候所有提供的 Task 物件完成執行。Waits for all of the provided Task objects to complete execution.

public:
 static void WaitAll(... cli::array <System::Threading::Tasks::Task ^> ^ tasks);
public static void WaitAll (params System.Threading.Tasks.Task[] tasks);
static member WaitAll : System.Threading.Tasks.Task[] -> unit
Public Shared Sub WaitAll (ParamArray tasks As Task())

參數

tasks
Task[]

要等待之 Task 執行個體的陣列。An array of Task instances on which to wait.

例外狀況

tasks 中的一個或多個 Task 物件已經處置。One or more of the Task objects in tasks has been disposed.

tasks 引數為 nullThe tasks argument is null.

tasks 引數包含 null 項目。The tasks argument contains a null element.

至少其中一個 Task 執行個體已取消。At least one of the Task instances was canceled. 如果工作已取消,AggregateException 例外狀況會在其 InnerExceptions 集合中包含 OperationCanceledException 例外狀況。If a task was canceled, the AggregateException exception contains an OperationCanceledException exception in its InnerExceptions collection.

-或--or- 至少其中一個 Task 執行個體在執行期間擲回例外狀況。An exception was thrown during the execution of at least one of the Task instances.

範例

下列範例會啟動10個工作,每個工作都會以狀態物件的形式傳遞索引。The following example starts 10 tasks, each of which is passed an index as a state object. 具有從二到五之索引的工作會擲回例外狀況。Tasks with an index from two to five throw exceptions. 方法的呼叫會 WaitAll 包裝物件中的所有例外狀況 AggregateException ,並將其傳播至呼叫的執行緒。The call to the WaitAll method wraps all exceptions in an AggregateException object and propagates it to the calling thread.

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

class Example
{
    static void Main()
    {
        var tasks = new List<Task<int>>();
         
        // Define a delegate that prints and returns the system tick count
        Func<object, int> action = (object obj) =>
        {
            int i = (int)obj;

            // Make each thread sleep a different time in order to return a different tick count
            Thread.Sleep(i * 100);

            // The tasks that receive an argument between 2 and 5 throw exceptions
            if (2 <= i && i <= 5)
            {
                throw new InvalidOperationException("SIMULATED EXCEPTION");
            }

            int tickCount = Environment.TickCount;
            Console.WriteLine("Task={0}, i={1}, TickCount={2}, Thread={3}", Task.CurrentId, i, tickCount, Thread.CurrentThread.ManagedThreadId);

            return tickCount;
        };

        // Construct started tasks
        for (int i = 0; i < 10; i++)
        {
            int index = i;
            tasks.Add(Task<int>.Factory.StartNew(action, index));
        }

        try
        {
            // Wait for all the tasks to finish.
            Task.WaitAll(tasks.ToArray());

            // We should never get to this point
            Console.WriteLine("WaitAll() has not thrown exceptions. THIS WAS NOT EXPECTED.");
        }
        catch (AggregateException e)
        {
            Console.WriteLine("\nThe following exceptions have been thrown by WaitAll(): (THIS WAS EXPECTED)");
            for (int j = 0; j < e.InnerExceptions.Count; j++)
            {
                Console.WriteLine("\n-------------------------------------------------\n{0}", e.InnerExceptions[j].ToString());
            }
        }
    }
}
// The example displays output like the following:
//     Task=1, i=0, TickCount=1203822250, Thread=3
//     Task=2, i=1, TickCount=1203822359, Thread=4
//     Task=7, i=6, TickCount=1203823484, Thread=3
//     Task=8, i=7, TickCount=1203823890, Thread=4
//     Task=9, i=8, TickCount=1203824296, Thread=3
//     Task=10, i=9, TickCount=1203824796, Thread=4
//     
//     The following exceptions have been thrown by WaitAll(): (THIS WAS EXPECTED)
//     
//     -------------------------------------------------
//     System.InvalidOperationException: SIMULATED EXCEPTION
//        at Example.<Main>b__0(Object obj)
//        at System.Threading.Tasks.Task`1.InnerInvoke()
//        at System.Threading.Tasks.Task.Execute()
//     
//     -------------------------------------------------
//     System.InvalidOperationException: SIMULATED EXCEPTION
//        at Example.<Main>b__0(Object obj)
//        at System.Threading.Tasks.Task`1.InnerInvoke()
//        at System.Threading.Tasks.Task.Execute()
//     
//     -------------------------------------------------
//     System.InvalidOperationException: SIMULATED EXCEPTION
//        at Example.<Main>b__0(Object obj)
//        at System.Threading.Tasks.Task`1.InnerInvoke()
//        at System.Threading.Tasks.Task.Execute()
//     
//     -------------------------------------------------
//     System.InvalidOperationException: SIMULATED EXCEPTION
//        at Example.<Main>b__0(Object obj)
//        at System.Threading.Tasks.Task`1.InnerInvoke()
//        at System.Threading.Tasks.Task.Execute()
Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks

Module WaitAllDemo
    Sub Main()
        Dim tasks As New List(Of Task(Of Integer))()
        ' Define a delegate that prints and returns the system tick count
        Dim action As Func(Of Object, Integer) = Function(obj As Object)
                                                     Dim i As Integer = CInt(obj)

                                                     ' Make each thread sleep a different time in order to return a different tick count
                                                     Thread.Sleep(i * 100)

                                                     ' The tasks that receive an argument between 2 and 5 throw exceptions
                                                     If 2 <= i AndAlso i <= 5 Then
                                                         Throw New InvalidOperationException("SIMULATED EXCEPTION")
                                                     End If

                                                     Dim tickCount As Integer = Environment.TickCount
                                                     Console.WriteLine("Task={0}, i={1}, TickCount={2}, Thread={3}", Task.CurrentId, i, tickCount, Thread.CurrentThread.ManagedThreadId)

                                                     Return tickCount
                                                 End Function

        ' Construct started tasks
        For i As Integer = 0 To 9
            Dim index As Integer = i
            tasks.Add(Task(Of Integer).Factory.StartNew(action, index))
        Next

        Try
            ' Wait for all the tasks to finish.
            Task.WaitAll(tasks.ToArray())

            ' We should never get to this point
            Console.WriteLine("WaitAll() has not thrown exceptions. THIS WAS NOT EXPECTED.")
        Catch e As AggregateException
            Console.WriteLine(vbLf & "The following exceptions have been thrown by WaitAll(): (THIS WAS EXPECTED)")
            For j As Integer = 0 To e.InnerExceptions.Count - 1
                Console.WriteLine(vbLf & "-------------------------------------------------" & vbLf & "{0}", e.InnerExceptions(j).ToString())
            Next
        End Try
    End Sub
End Module
' The example displays output like the following:
'     Task=1, i=0, TickCount=1203822250, Thread=3
'     Task=2, i=1, TickCount=1203822359, Thread=4
'     Task=7, i=6, TickCount=1203823484, Thread=3
'     Task=8, i=7, TickCount=1203823890, Thread=4
'     Task=9, i=8, TickCount=1203824296, Thread=3
'     Task=10, i=9, TickCount=1203824796, Thread=4
'     
'     The following exceptions have been thrown by WaitAll(): (THIS WAS EXPECTED)
'     
'     -------------------------------------------------
'     System.InvalidOperationException: SIMULATED EXCEPTION
'        at Example.<Main>b__0(Object obj)
'        at System.Threading.Tasks.Task`1.InnerInvoke()
'        at System.Threading.Tasks.Task.Execute()
'     
'     -------------------------------------------------
'     System.InvalidOperationException: SIMULATED EXCEPTION
'        at Example.<Main>b__0(Object obj)
'        at System.Threading.Tasks.Task`1.InnerInvoke()
'        at System.Threading.Tasks.Task.Execute()
'     
'     -------------------------------------------------
'     System.InvalidOperationException: SIMULATED EXCEPTION
'        at Example.<Main>b__0(Object obj)
'        at System.Threading.Tasks.Task`1.InnerInvoke()
'        at System.Threading.Tasks.Task.Execute()
'     
'     -------------------------------------------------
'     System.InvalidOperationException: SIMULATED EXCEPTION
'        at Example.<Main>b__0(Object obj)
'        at System.Threading.Tasks.Task`1.InnerInvoke()
'        at System.Threading.Tasks.Task.Execute()

適用於

WaitAll(Task[], Int32)

等待所有提供的 Task 物件在指定的毫秒數內完成執行。Waits for all of the provided Task objects to complete execution within a specified number of milliseconds.

public:
 static bool WaitAll(cli::array <System::Threading::Tasks::Task ^> ^ tasks, int millisecondsTimeout);
public static bool WaitAll (System.Threading.Tasks.Task[] tasks, int millisecondsTimeout);
static member WaitAll : System.Threading.Tasks.Task[] * int -> bool
Public Shared Function WaitAll (tasks As Task(), millisecondsTimeout As Integer) As Boolean

參數

tasks
Task[]

要等待之 Task 執行個體的陣列。An array of Task instances on which to wait.

millisecondsTimeout
Int32

要等候的毫秒數,如果要無限期等候,則為 Infinite (-1)。The number of milliseconds to wait, or Infinite (-1) to wait indefinitely.

傳回

Boolean

如果所有 true 執行個體在指定的時間內執行完成,則為 Task,否則為 falsetrue if all of the Task instances completed execution within the allotted time; otherwise, false.

例外狀況

tasks 中的一個或多個 Task 物件已經處置。One or more of the Task objects in tasks has been disposed.

tasks 引數為 nullThe tasks argument is null.

至少其中一個 Task 執行個體已取消。At least one of the Task instances was canceled. 如果工作已取消,AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledExceptionIf a task was canceled, the AggregateException contains an OperationCanceledException in its InnerExceptions collection.

-或--or- 至少其中一個 Task 執行個體在執行期間擲回例外狀況。An exception was thrown during the execution of at least one of the Task instances.

millisecondsTimeout 為 -1 以外的負數,表示無限逾時。millisecondsTimeout is a negative number other than -1, which represents an infinite time-out.

tasks 引數包含 null 項目。The tasks argument contains a null element.

適用於

WaitAll(Task[], CancellationToken)

等候所有提供的 Task 物件完成執行。Waits for all of the provided Task objects to complete execution unless the wait is cancelled.

public:
 static void WaitAll(cli::array <System::Threading::Tasks::Task ^> ^ tasks, System::Threading::CancellationToken cancellationToken);
public static void WaitAll (System.Threading.Tasks.Task[] tasks, System.Threading.CancellationToken cancellationToken);
static member WaitAll : System.Threading.Tasks.Task[] * System.Threading.CancellationToken -> unit
Public Shared Sub WaitAll (tasks As Task(), cancellationToken As CancellationToken)

參數

tasks
Task[]

要等待之 Task 執行個體的陣列。An array of Task instances on which to wait.

cancellationToken
CancellationToken

等候工作完成時要觀察的 CancellationTokenA CancellationToken to observe while waiting for the tasks to complete.

例外狀況

已取消 cancellationTokenThe cancellationToken was canceled.

tasks 引數為 nullThe tasks argument is null.

至少其中一個 Task 執行個體已取消。At least one of the Task instances was canceled. 如果工作已取消,AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledExceptionIf a task was canceled, the AggregateException contains an OperationCanceledException in its InnerExceptions collection.

-或--or- 至少其中一個 Task 執行個體在執行期間擲回例外狀況。An exception was thrown during the execution of at least one of the Task instances.

tasks 引數包含 null 項目。The tasks argument contains a null element.

tasks 中的一個或多個 Task 物件已經處置。One or more of the Task objects in tasks has been disposed.

備註

cancellationToken引數用來取消等候作業。The cancellationToken argument is used to cancel the wait operation. 取消工作是一項不同的作業,並 AggregateException 以上述方式發出信號。Cancellation of the tasks is a distinct operation, and is signaled by the AggregateException as noted above.

適用於

WaitAll(Task[], TimeSpan)

等候所有提供的可取消 Task 物件在指定的時間間隔內完成執行。Waits for all of the provided cancellable Task objects to complete execution within a specified time interval.

public:
 static bool WaitAll(cli::array <System::Threading::Tasks::Task ^> ^ tasks, TimeSpan timeout);
public static bool WaitAll (System.Threading.Tasks.Task[] tasks, TimeSpan timeout);
static member WaitAll : System.Threading.Tasks.Task[] * TimeSpan -> bool
Public Shared Function WaitAll (tasks As Task(), timeout As TimeSpan) As Boolean

參數

tasks
Task[]

要等待之 Task 執行個體的陣列。An array of Task instances on which to wait.

timeout
TimeSpan

TimeSpan,代表等候毫秒數;或是 TimeSpan,代表無限期等候的 -1 毫秒。A TimeSpan that represents the number of milliseconds to wait, or a TimeSpan that represents -1 milliseconds to wait indefinitely.

傳回

Boolean

如果所有 true 執行個體在指定的時間內執行完成,則為 Task,否則為 falsetrue if all of the Task instances completed execution within the allotted time; otherwise, false.

例外狀況

tasks 中的一個或多個 Task 物件已經處置。One or more of the Task objects in tasks has been disposed.

tasks 引數為 nullThe tasks argument is null.

至少其中一個 Task 執行個體已取消。At least one of the Task instances was canceled. 如果工作已取消,AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledExceptionIf a task was canceled, the AggregateException contains an OperationCanceledException in its InnerExceptions collection.

-或--or- 至少其中一個 Task 執行個體在執行期間擲回例外狀況。An exception was thrown during the execution of at least one of the Task instances.

timeout 為 -1 毫秒以外的負數,表示無限逾時。timeout is a negative number other than -1 milliseconds, which represents an infinite time-out. -或--or- timeout 大於 MaxValuetimeout is greater than MaxValue.

tasks 引數包含 null 項目。The tasks argument contains a null element.

適用於

WaitAll(Task[], Int32, CancellationToken)

等待所有提供的 Task 物件在指定的毫秒數內完成執行。Waits for all of the provided Task objects to complete execution within a specified number of milliseconds or until the wait is cancelled.

public:
 static bool WaitAll(cli::array <System::Threading::Tasks::Task ^> ^ tasks, int millisecondsTimeout, System::Threading::CancellationToken cancellationToken);
public static bool WaitAll (System.Threading.Tasks.Task[] tasks, int millisecondsTimeout, System.Threading.CancellationToken cancellationToken);
static member WaitAll : System.Threading.Tasks.Task[] * int * System.Threading.CancellationToken -> bool
Public Shared Function WaitAll (tasks As Task(), millisecondsTimeout As Integer, cancellationToken As CancellationToken) As Boolean

參數

tasks
Task[]

要等待之 Task 執行個體的陣列。An array of Task instances on which to wait.

millisecondsTimeout
Int32

要等候的毫秒數,如果要無限期等候,則為 Infinite (-1)。The number of milliseconds to wait, or Infinite (-1) to wait indefinitely.

cancellationToken
CancellationToken

等候工作完成時要觀察的 CancellationTokenA CancellationToken to observe while waiting for the tasks to complete.

傳回

Boolean

如果所有 true 執行個體在指定的時間內執行完成,則為 Task,否則為 falsetrue if all of the Task instances completed execution within the allotted time; otherwise, false.

例外狀況

tasks 中的一個或多個 Task 物件已經處置。One or more of the Task objects in tasks has been disposed.

tasks 引數為 nullThe tasks argument is null.

至少其中一個 Task 執行個體已取消。At least one of the Task instances was canceled. 如果工作已取消,AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledExceptionIf a task was canceled, the AggregateException contains an OperationCanceledException in its InnerExceptions collection.

-或--or- 至少其中一個 Task 執行個體在執行期間擲回例外狀況。An exception was thrown during the execution of at least one of the Task instances.

millisecondsTimeout 為 -1 以外的負數,表示無限逾時。millisecondsTimeout is a negative number other than -1, which represents an infinite time-out.

tasks 引數包含 null 項目。The tasks argument contains a null element.

已取消 cancellationTokenThe cancellationToken was canceled.

備註

cancellationToken引數用來取消等候作業。The cancellationToken argument is used to cancel the wait operation. 取消工作是一項不同的作業,並由上面所述的方式發出信號 AggregateExceptionCancellation of the tasks is a distinct operation, and is signaled by the AggregateException noted above.

適用於