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我一直在尝试不同的方法来异步处理数据。我有一段代码可以在图像处理应用程序中完成这样的任务，但对我来说似乎很尴尬。我正在寻找符合当前标准的建议，或要遵循的编码约定：

' this code is run on a background thread
Dim lockThreadCounter As New Object()
Dim runningThreadCounter As Integer = 0
Dim decrementCounterCallback As New AsyncCallback(
    Sub()
        SyncLock lockThreadCounter
            runningThreadCounter -= 1
        End SyncLock
    End Sub)
runningThreadCounter += 1
widthsAdder.BeginInvoke(widthsSlow, decrementCounterCallback, Nothing)
runningThreadCounter += 1
widthsAdder.BeginInvoke(widthsFast, decrementCounterCallback, Nothing)
runningThreadCounter += 1
bruteForceCalculateR2.BeginInvoke(numberOfSamples, pixelsSlow, decrementCounterCallback, Nothing)
runningThreadCounter += 1
bruteForceCalculateR2.BeginInvoke(numberOfSamples, pixelsFast, decrementCounterCallback, Nothing)
' wait here for all four tasks to complete
While runningThreadCounter > 0
    Thread.Sleep(1)
End While
' resume with the rest of the code once all four tasks have completed

我考虑过Parallel.Foreach但无法提出使用它的解决方案，因为任务具有不同的委托足迹。

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1 回答 1

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You can use the Task class to initiate your work, and Task.WaitAll to wait for them to complete.

This eliminates the need to have a "running thread counter", as each task can just be stored and waited upon as a group.

This would look something like (once you remove your callbacks):

Dim widths1 = Task.Factory.StartNew(Sub() widthsSlow())
Dim widths2 = Task.Factory.StartNew(Sub() widthsFast())
Dim bruteForce1 = Task.Factory.StartNew(Sub() numberOfSamples(pixelsSlow))
Dim bruteForce2 = Task.Factory.StartNew(Sub() numberOfSamples(pixelsFast))

' Wait for all to complete without the loop
Task.WaitAll(widths1, widths2, bruteForce1, bruteForce2)
于 2013-07-09T16:16:44.433 回答