我想知道IDataflowBlock.Completion是否有一种巧妙的方法来替换需要使用ReceiveAsync的取消令牌或类似的方法，这种方法消耗来自BufferBlock或其他{ {1}}。
IDataflowBlock如果IDataflowBlock.ReceiveAsync<T>(TimeSpan, CancellationToken)
是InputQueue：
BufferBlock如果已调用BufferBlock<String> InputQueue
for (int i = 0; i < 26; i++)
{
await InputQueue.SendAsync(((char)(97 + i)).ToString());
}
，则当队列清空并且InputQueue.Complete();将更改为状态 RanToCompletion 时，
可以使用IDataflowBlock.Completion进行检查。
如果多个线程从队列中取出，这可能发生在IDataflowBlock.Completion.IsCompleted期间，是否有更简洁的替代方法来处理InputQueue.ReceiveAsync完成：
InputQueue答案 0 :(得分：0)
cancel a Dataflow Block最简单的方法是将令牌提供给块的构造函数，如下所示：
CREATE OR REPLACE RULE skip_unique AS ON INSERT TO account WHERE (EXISTS (SELECT 1 FROM account WHERE NEW.value->>'opCo' = OLD.value->>'opCo' AND NEW.value->>'customerId' = OLD.value->>'customerId')) DO INSTEAD NOTHING;
CREATE OR REPLACE RULE skip_unique AS ON INSERT TO account WHERE (EXISTS (SELECT 1 FROM account AS b WHERE b.value->>'opCo' = account.value->>'opCo' AND b.value->>'customerId' = account.value->>'customerId')) DO INSTEAD NOTHING;
CREATE OR REPLACE RULE skip_unique AS ON INSERT TO account old WHERE (NEW.value->>'opCo' = old.value->>'opCo' AND NEW.value->>'customerId' = old.value->>'customerId') DO INSTEAD NOTHING;
CancellationToken is defined in DataflowBlockOptions class，即使new ExecutionDataflowBlockOptions
{
CancellationToken = cancellationSource.Token
});
也可以取消。
为什么要自己实施BufferBlock逻辑？将PropagateCompletion与linking your blocks一起使用是否有一些限制？例如，如果您的代码如下所示：
Receive然后你可以像这样使用internal void HandleMessage()
{
try
{
var parcel = await InputQueue.ReceiveAsync(timeSpan);
// handle parsel
}
catch(InvalidOperationException x)
{
}
}
：
ActionBlock另请注意，如果您需要与UI进行某些互动，则可以将最后一个块用作IObservable Rx.Net库。