ParallelLoopState.LowestBreakIteration 속성
정의
중요
일부 정보는 릴리스되기 전에 상당 부분 수정될 수 있는 시험판 제품과 관련이 있습니다. Microsoft는 여기에 제공된 정보에 대해 어떠한 명시적이거나 묵시적인 보증도 하지 않습니다.
Break()가 호출된 루프의 가장 낮은 반복을 가져옵니다.
public:
property Nullable<long> LowestBreakIteration { Nullable<long> get(); };public long? LowestBreakIteration { get; }member this.LowestBreakIteration : Nullable<int64>Public ReadOnly Property LowestBreakIteration As Nullable(Of Long)속성 값
호출된 Break() 가장 낮은 반복입니다. ForEach<TSource>(Partitioner<TSource>, Action<TSource>) 루프의 경우 값은 내부에서 생성된 인덱스를 기반으로 합니다.
예제
다음 예제에서는 루프를 최대 100회 병렬로 실행합니다. 각 반복은 1~1,000밀리초의 임의 간격으로 일시 중지됩니다. 임의로 생성된 값은 메서드가 호출되는 루프의 반복을 Break 결정합니다. 이렇게 하면 인덱스가 속성 값보다 LowestBreakIteration 큰 반복이 메서드 호출 Break 후에 시작되지 않지만 이미 실행되기 시작한 반복에는 영향을 주지 않습니다. 이러한 작업이 완료되지 않도록 하기 위해 각 반복은 메서드를 ShouldExitCurrentIteration 호출하여 다른 반복에서 메서드를 Break 호출했는지 여부를 확인합니다. 이 경우 반복은 속성 값을 확인하고 현재 반복의 LowestBreakIteration 인덱스 값보다 크면 즉시 반환됩니다.
using System;
using System.Threading;
using System.Threading.Tasks;
public class Example
{
public static void Main()
{
var rnd = new Random();
int breakIndex = rnd.Next(1, 11);
Console.WriteLine($"Will call Break at iteration {breakIndex}\n");
var result = Parallel.For(1, 101, (i, state) =>
{
Console.WriteLine($"Beginning iteration {i}");
int delay;
lock (rnd)
delay = rnd.Next(1, 1001);
Thread.Sleep(delay);
if (state.ShouldExitCurrentIteration)
{
if (state.LowestBreakIteration < i)
return;
}
if (i == breakIndex)
{
Console.WriteLine($"Break in iteration {i}");
state.Break();
}
Console.WriteLine($"Completed iteration {i}");
});
if (result.LowestBreakIteration.HasValue)
Console.WriteLine($"\nLowest Break Iteration: {result.LowestBreakIteration}");
else
Console.WriteLine($"\nNo lowest break iteration.");
}
}
// The example displays output like the following:
// Will call Break at iteration 8
//
// Beginning iteration 1
// Beginning iteration 13
// Beginning iteration 97
// Beginning iteration 25
// Beginning iteration 49
// Beginning iteration 37
// Beginning iteration 85
// Beginning iteration 73
// Beginning iteration 61
// Completed iteration 85
// Beginning iteration 86
// Completed iteration 61
// Beginning iteration 62
// Completed iteration 86
// Beginning iteration 87
// Completed iteration 37
// Beginning iteration 38
// Completed iteration 38
// Beginning iteration 39
// Completed iteration 25
// Beginning iteration 26
// Completed iteration 26
// Beginning iteration 27
// Completed iteration 73
// Beginning iteration 74
// Completed iteration 62
// Beginning iteration 63
// Completed iteration 39
// Beginning iteration 40
// Completed iteration 40
// Beginning iteration 41
// Completed iteration 13
// Beginning iteration 14
// Completed iteration 1
// Beginning iteration 2
// Completed iteration 97
// Beginning iteration 98
// Completed iteration 49
// Beginning iteration 50
// Completed iteration 87
// Completed iteration 27
// Beginning iteration 28
// Completed iteration 50
// Beginning iteration 51
// Beginning iteration 88
// Completed iteration 14
// Beginning iteration 15
// Completed iteration 15
// Completed iteration 2
// Beginning iteration 3
// Beginning iteration 16
// Completed iteration 63
// Beginning iteration 64
// Completed iteration 74
// Beginning iteration 75
// Completed iteration 41
// Beginning iteration 42
// Completed iteration 28
// Beginning iteration 29
// Completed iteration 29
// Beginning iteration 30
// Completed iteration 98
// Beginning iteration 99
// Completed iteration 64
// Beginning iteration 65
// Completed iteration 42
// Beginning iteration 43
// Completed iteration 88
// Beginning iteration 89
// Completed iteration 51
// Beginning iteration 52
// Completed iteration 16
// Beginning iteration 17
// Completed iteration 43
// Beginning iteration 44
// Completed iteration 44
// Beginning iteration 45
// Completed iteration 99
// Beginning iteration 4
// Completed iteration 3
// Beginning iteration 8
// Completed iteration 4
// Beginning iteration 5
// Completed iteration 52
// Beginning iteration 53
// Completed iteration 75
// Beginning iteration 76
// Completed iteration 76
// Beginning iteration 77
// Completed iteration 65
// Beginning iteration 66
// Completed iteration 5
// Beginning iteration 6
// Completed iteration 89
// Beginning iteration 90
// Completed iteration 30
// Beginning iteration 31
// Break in iteration 8
// Completed iteration 8
// Completed iteration 6
// Beginning iteration 7
// Completed iteration 7
//
// Lowest Break Iteration: 8
Imports System.Threading
Imports System.Threading.Tasks
Module Example
Public Sub Main()
Dim rnd As New Random()
Dim breakIndex As Integer = rnd.Next(1, 11)
Dim lowest As New Nullable(Of Long)()
Console.WriteLine("Will call Break at iteration {0}", breakIndex)
Console.WriteLine()
Dim result = Parallel.For(1, 101, Sub(i, state)
Console.WriteLine("Beginning iteration {0}", i)
Dim delay As Integer
Monitor.Enter(rnd)
delay = rnd.Next(1, 1001)
Monitor.Exit(rnd)
Thread.Sleep(delay)
If state.ShouldExitCurrentIteration Then
If state.LowestBreakIteration < i Then
Return
End If
End If
If i = breakIndex Then
Console.WriteLine("Break in iteration {0}", i)
state.Break()
If state.LowestBreakIteration.HasValue Then
If lowest < state.LowestBreakIteration Then
lowest = state.LowestBreakIteration
Else
lowest = state.LowestBreakIteration
End If
End If
End If
Console.WriteLine("Completed iteration {0}", i)
End Sub )
Console.WriteLine()
If lowest.HasValue Then
Console.WriteLine("Lowest Break Iteration: {0}", lowest)
Else
Console.WriteLine("No lowest break iteration.")
End If
End Sub
End Module
' The example displays output like the following:
' Will call Break at iteration 8
'
' Beginning iteration 1
' Beginning iteration 13
' Beginning iteration 97
' Beginning iteration 25
' Beginning iteration 49
' Beginning iteration 37
' Beginning iteration 85
' Beginning iteration 73
' Beginning iteration 61
' Completed iteration 85
' Beginning iteration 86
' Completed iteration 61
' Beginning iteration 62
' Completed iteration 86
' Beginning iteration 87
' Completed iteration 37
' Beginning iteration 38
' Completed iteration 38
' Beginning iteration 39
' Completed iteration 25
' Beginning iteration 26
' Completed iteration 26
' Beginning iteration 27
' Completed iteration 73
' Beginning iteration 74
' Completed iteration 62
' Beginning iteration 63
' Completed iteration 39
' Beginning iteration 40
' Completed iteration 40
' Beginning iteration 41
' Completed iteration 13
' Beginning iteration 14
' Completed iteration 1
' Beginning iteration 2
' Completed iteration 97
' Beginning iteration 98
' Completed iteration 49
' Beginning iteration 50
' Completed iteration 87
' Completed iteration 27
' Beginning iteration 28
' Completed iteration 50
' Beginning iteration 51
' Beginning iteration 88
' Completed iteration 14
' Beginning iteration 15
' Completed iteration 15
' Completed iteration 2
' Beginning iteration 3
' Beginning iteration 16
' Completed iteration 63
' Beginning iteration 64
' Completed iteration 74
' Beginning iteration 75
' Completed iteration 41
' Beginning iteration 42
' Completed iteration 28
' Beginning iteration 29
' Completed iteration 29
' Beginning iteration 30
' Completed iteration 98
' Beginning iteration 99
' Completed iteration 64
' Beginning iteration 65
' Completed iteration 42
' Beginning iteration 43
' Completed iteration 88
' Beginning iteration 89
' Completed iteration 51
' Beginning iteration 52
' Completed iteration 16
' Beginning iteration 17
' Completed iteration 43
' Beginning iteration 44
' Completed iteration 44
' Beginning iteration 45
' Completed iteration 99
' Beginning iteration 4
' Completed iteration 3
' Beginning iteration 8
' Completed iteration 4
' Beginning iteration 5
' Completed iteration 52
' Beginning iteration 53
' Completed iteration 75
' Beginning iteration 76
' Completed iteration 76
' Beginning iteration 77
' Completed iteration 65
' Beginning iteration 66
' Completed iteration 5
' Beginning iteration 6
' Completed iteration 89
' Beginning iteration 90
' Completed iteration 30
' Beginning iteration 31
' Break in iteration 8
' Completed iteration 8
' Completed iteration 6
' Beginning iteration 7
' Completed iteration 7
'
' Lowest Break Iteration: 8
값이 LowestBreakIteration 병렬 루프 외부의 범위를 벗어나므로 값을 유지하려는 경우 루프 외부에 표시되는 변수에 할당해야 합니다.
설명
병렬 루프를 여러 차례 반복하여 메서드를 호출 Break 할 수 있습니다. 이 경우 이 값은 호출 Break된 반복의 가장 작은 인덱스입니다. 호출 Break된 루프의 반복이 없으면 이 속성이 반환됩니다 null. 속성 값은 메서드 호출 Stop 의 영향을 받지 않습니다.
메서드를 호출하는 반복 이후의 모든 반복이 실행 LowestBreakIteration 되지 않아도 되는 장기 실행 반복에서는 메서드를 호출 Break 하기 전에 실행을 시작한 반복을 종료하는 데 속성이 Break 사용됩니다. 인덱스가 경쟁 실행에서 가장 낮은 중단 반복보다 큰 반복을 중지하려면 다음을 수행해야 합니다.
속성
true이 ShouldExitCurrentIteration .인지 확인합니다.인덱스가 속성 값보다 LowestBreakIteration 크면 반복에서 종료합니다.
예제에서는 그림을 제공합니다.