Task.WaitAll 方法

參考

定義

命名空間:: System.Threading.Tasks

組件:: System.Threading.Tasks.dll

組件:: System.Runtime.dll

組件:: mscorlib.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

等候所有提供的 Task 物件完成執行。

多載

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。
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。
WaitAll(Task[], CancellationToken)	等候所有提供的 Task 物件完成執行。
WaitAll(Task[])	等候所有提供的 Task 物件完成執行。
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。

WaitAll(Task[], Int32, CancellationToken)

Source:: Task.cs

Source:: Task.cs

Source:: Task.cs

等待所有提供的 Task 物件在指定的毫秒數內完成執行。

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);

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
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

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
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。

millisecondsTimeout: Int32

要等候的毫秒數，如果要無限期等候，則為 Infinite (-1)。

cancellationToken: CancellationToken

等候工作完成時要觀察的 CancellationToken。

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 false。

屬性: UnsupportedOSPlatformAttribute

例外狀況

ObjectDisposedException

tasks 中的一個或多個 Task 物件已經處置。

ArgumentNullException

tasks 引數為 null。

AggregateException

至少其中一個 Task 執行個體已取消。如果工作已取消，AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledException。

-或-

至少其中一個 Task 執行個體在執行期間擲回例外狀況。

ArgumentOutOfRangeException

millisecondsTimeout 為 -1 以外的負數，表示無限逾時。

ArgumentException

tasks 引數包含 null 項目。

OperationCanceledException

已取消 cancellationToken。

備註

自 cancellationToken 變數用來取消等候作業。取消工作是不同的作業，並且會由 AggregateException 上述的發出訊號。

適用於

WaitAll(Task[], TimeSpan)

Source:: Task.cs

Source:: Task.cs

Source:: Task.cs

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。

public:
 static bool WaitAll(cli::array <System::Threading::Tasks::Task ^> ^ tasks, TimeSpan timeout);

public static bool WaitAll (System.Threading.Tasks.Task[] tasks, TimeSpan timeout);

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static bool WaitAll (System.Threading.Tasks.Task[] tasks, TimeSpan timeout);

static member WaitAll : System.Threading.Tasks.Task[] * TimeSpan -> bool

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
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。

timeout: TimeSpan

TimeSpan，代表等候毫秒數；或是 TimeSpan，代表無限期等候的 -1 毫秒。

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 false。

屬性: UnsupportedOSPlatformAttribute

例外狀況

ObjectDisposedException

tasks 中的一個或多個 Task 物件已經處置。

ArgumentNullException

tasks 引數為 null。

AggregateException

至少其中一個 Task 執行個體已取消。如果工作已取消，AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledException。

-或-

至少其中一個 Task 執行個體在執行期間擲回例外狀況。

ArgumentOutOfRangeException

timeout 為 -1 毫秒以外的負數，表示無限逾時。

-或-

timeout 大於 Int32.MaxValue。

ArgumentException

tasks 引數包含 null 項目。

適用於

WaitAll(Task[], CancellationToken)

Source:: Task.cs

Source:: Task.cs

Source:: Task.cs

等候所有提供的 Task 物件完成執行。

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);

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static void WaitAll (System.Threading.Tasks.Task[] tasks, System.Threading.CancellationToken cancellationToken);

static member WaitAll : System.Threading.Tasks.Task[] * System.Threading.CancellationToken -> unit

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
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。

cancellationToken: CancellationToken

等候工作完成時要觀察的 CancellationToken。

屬性: UnsupportedOSPlatformAttribute

例外狀況

OperationCanceledException

已取消 cancellationToken。

ArgumentNullException

tasks 引數為 null。

AggregateException

至少其中一個 Task 執行個體已取消。如果工作已取消，AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledException。

-或-

至少其中一個 Task 執行個體在執行期間擲回例外狀況。

ArgumentException

tasks 引數包含 null 項目。

ObjectDisposedException

tasks 中的一個或多個 Task 物件已經處置。

備註

自 cancellationToken 變數用來取消等候作業。取消工作是不同的作業，而且會以 AggregateException 上述方式發出訊號。

適用於

WaitAll(Task[])

Source:: Task.cs

Source:: Task.cs

Source:: Task.cs

等候所有提供的 Task 物件完成執行。

public:
 static void WaitAll(... cli::array <System::Threading::Tasks::Task ^> ^ tasks);

public static void WaitAll (params System.Threading.Tasks.Task[] tasks);

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static void WaitAll (params System.Threading.Tasks.Task[] tasks);

static member WaitAll : System.Threading.Tasks.Task[] -> unit

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
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。

屬性: UnsupportedOSPlatformAttribute

例外狀況

ObjectDisposedException

tasks 中的一個或多個 Task 物件已經處置。

ArgumentNullException

tasks 引數為 null。

ArgumentException

tasks 引數包含 null 項目。

AggregateException

至少其中一個 Task 執行個體已取消。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。

-或-

至少其中一個 Task 執行個體在執行期間擲回例外狀況。

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。索引為 2 到 5 的工作會擲回例外狀況。方法的呼叫 WaitAll 會將所有例外狀況包裝在物件中 AggregateException ，並將它傳播至呼叫執行緒。

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()

open System
open System.Threading
open System.Threading.Tasks

// Define a delegate that prints and returns the system tick count
let action =
    fun (obj: obj) ->
        let i = obj :?> int

        // 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 then
            raise (InvalidOperationException "SIMULATED EXCEPTION")


        let tickCount = Environment.TickCount
        printfn $"Task={Task.CurrentId}, i={i}, TickCount={tickCount}, Thread={Thread.CurrentThread.ManagedThreadId}"
        tickCount

// Construct started tasks
let tasks =
    [| for i = 0 to 9 do
           Task<int>.Factory.StartNew (action, i) |]

try

    // Wait for all the tasks to finish.
    Seq.cast tasks |> Seq.toArray |> Task.WaitAll

    // We should never get to this point
    printfn "WaitAll() has not thrown exceptions. THIS WAS NOT EXPECTED."

with :? AggregateException as e ->
    printfn "\nThe following exceptions have been thrown by WaitAll(): (THIS WAS EXPECTED)"

    for ex in e.InnerExceptions do
        printfn $"\n-------------------------------------------------\n{ex}"

// 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)

Source:: Task.cs

Source:: Task.cs

Source:: Task.cs

等待所有提供的 Task 物件在指定的毫秒數內完成執行。

public:
 static bool WaitAll(cli::array <System::Threading::Tasks::Task ^> ^ tasks, int millisecondsTimeout);

public static bool WaitAll (System.Threading.Tasks.Task[] tasks, int millisecondsTimeout);

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static bool WaitAll (System.Threading.Tasks.Task[] tasks, int millisecondsTimeout);

static member WaitAll : System.Threading.Tasks.Task[] * int -> bool

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
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。

millisecondsTimeout: Int32

要等候的毫秒數，如果要無限期等候，則為 Infinite (-1)。

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 false。

屬性: UnsupportedOSPlatformAttribute

例外狀況

ObjectDisposedException

tasks 中的一個或多個 Task 物件已經處置。

ArgumentNullException

tasks 引數為 null。

AggregateException

至少其中一個 Task 執行個體已取消。如果工作已取消，AggregateException 會在其 InnerExceptions 集合中包含 OperationCanceledException。

-或-

至少其中一個 Task 執行個體在執行期間擲回例外狀況。

ArgumentOutOfRangeException

millisecondsTimeout 為 -1 以外的負數，表示無限逾時。

ArgumentException

tasks 引數包含 null 項目。

適用於

Task.WaitAll 方法

定義

多載

WaitAll(Task[], Int32, CancellationToken)

參數

傳回

例外狀況

備註

適用於

WaitAll(Task[], TimeSpan)

參數

傳回

例外狀況

適用於

WaitAll(Task[], CancellationToken)

參數

例外狀況

備註

適用於

WaitAll(Task[])

參數

例外狀況

範例

適用於

WaitAll(Task[], Int32)

參數

傳回

例外狀況

適用於

意見反應

其他資源