ActionBlock<TInput>.Post(TInput) 方法
定義
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。
將項目張貼至目標資料流程區塊。
public:
bool Post(TInput item);
public bool Post (TInput item);
member this.Post : 'Input -> bool
Public Function Post (item As TInput) As Boolean
參數
- item
- TInput
提供給目標的項目。
傳回
如果項目是張貼至資料流程區塊則為 true
,否則為 false
。
範例
下列範例示範如何使用 Post 方法將專案張貼至目標資料流程區塊。 此程式碼範例是 如何:在資料流程區塊主題中指定平行處理原則程度 之較大範例的一部分。
// Performs several computations by using dataflow and returns the elapsed
// time required to perform the computations.
static TimeSpan TimeDataflowComputations(int maxDegreeOfParallelism,
int messageCount)
{
// Create an ActionBlock<int> that performs some work.
var workerBlock = new ActionBlock<int>(
// Simulate work by suspending the current thread.
millisecondsTimeout => Thread.Sleep(millisecondsTimeout),
// Specify a maximum degree of parallelism.
new ExecutionDataflowBlockOptions
{
MaxDegreeOfParallelism = maxDegreeOfParallelism
});
// Compute the time that it takes for several messages to
// flow through the dataflow block.
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
for (int i = 0; i < messageCount; i++)
{
workerBlock.Post(1000);
}
workerBlock.Complete();
// Wait for all messages to propagate through the network.
workerBlock.Completion.Wait();
// Stop the timer and return the elapsed number of milliseconds.
stopwatch.Stop();
return stopwatch.Elapsed;
}
' Demonstrates how to specify the maximum degree of parallelism
' when using dataflow.
Friend Class Program
' Performs several computations by using dataflow and returns the elapsed
' time required to perform the computations.
Private Shared Function TimeDataflowComputations(ByVal maxDegreeOfParallelism As Integer, ByVal messageCount As Integer) As TimeSpan
' Create an ActionBlock<int> that performs some work.
Dim workerBlock = New ActionBlock(Of Integer)(Function(millisecondsTimeout) Pause(millisecondsTimeout), New ExecutionDataflowBlockOptions() With { .MaxDegreeOfParallelism = maxDegreeOfParallelism})
' Simulate work by suspending the current thread.
' Specify a maximum degree of parallelism.
' Compute the time that it takes for several messages to
' flow through the dataflow block.
Dim stopwatch As New Stopwatch()
stopwatch.Start()
For i As Integer = 0 To messageCount - 1
workerBlock.Post(1000)
Next i
workerBlock.Complete()
' Wait for all messages to propagate through the network.
workerBlock.Completion.Wait()
' Stop the timer and return the elapsed number of milliseconds.
stopwatch.Stop()
Return stopwatch.Elapsed
End Function
Private Shared Function Pause(ByVal obj As Object)
Thread.Sleep(obj)
Return Nothing
End Function