JoinBlock<T1,T2>.ISourceBlock<Tuple<T1,T2>>.ConsumeMessage 方法

 virtual Tuple<T1, T2> ^ System.Threading.Tasks.Dataflow.ISourceBlock<System.Tuple<T1,T2>>.ConsumeMessage(System::Threading::Tasks::Dataflow::DataflowMessageHeader messageHeader, System::Threading::Tasks::Dataflow::ITargetBlock<Tuple<T1, T2> ^> ^ target, [Runtime::InteropServices::Out] bool % messageConsumed) = System::Threading::Tasks::Dataflow::ISourceBlock<Tuple<T1, T2> ^>::ConsumeMessage;

Tuple<T1,T2> ISourceBlock<Tuple<T1,T2>>.ConsumeMessage(System.Threading.Tasks.Dataflow.DataflowMessageHeader messageHeader, System.Threading.Tasks.Dataflow.ITargetBlock<Tuple<T1,T2>> target, out bool messageConsumed);

abstract member System.Threading.Tasks.Dataflow.ISourceBlock<System.Tuple<T1,T2>>.ConsumeMessage : System.Threading.Tasks.Dataflow.DataflowMessageHeader * System.Threading.Tasks.Dataflow.ITargetBlock<'T1 * 'T2> * bool -> 'T1 * 'T2
override this.System.Threading.Tasks.Dataflow.ISourceBlock<System.Tuple<T1,T2>>.ConsumeMessage : System.Threading.Tasks.Dataflow.DataflowMessageHeader * System.Threading.Tasks.Dataflow.ITargetBlock<'T1 * 'T2> * bool -> 'T1 * 'T2

Function ConsumeMessage (messageHeader As DataflowMessageHeader, target As ITargetBlock(Of Tuple(Of T1, T2)), ByRef messageConsumed As Boolean) As Tuple(Of T1, T2) Implements ISourceBlock(Of Tuple(Of T1, T2)).ConsumeMessage

參數

傳回

消費訊息的價值。 這可能對應於先前保留並傳給DataflowMessageHeader此方法的不同messageHeader實例。 消費 ITargetBlock<TInput> 方必須使用回傳的值，而非傳 messageValue 給 OfferMessage(DataflowMessageHeader, TInput, ISourceBlock<TInput>, Boolean)的值。 若請求的訊息不可用，回傳值為 null（Visual Basic 中為 Nothing）。

實作

例外狀況

備註

訊息要被消費的 節點 ITargetBlock<TInput> 不必從此 ISourceBlock<TOutput> 實例連結。 此外，這個 ISourceBlock<TOutput> 實例可能從未直接將訊息提供給 ITargetBlock<TInput>。