TransformManyBlock<TInput,TOutput>.ISourceBlock<TOutput>.ConsumeMessage 方法

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

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

abstract member System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>.ConsumeMessage : System.Threading.Tasks.Dataflow.DataflowMessageHeader * System.Threading.Tasks.Dataflow.ITargetBlock<'Output> * bool -> 'Output
override this.System.Threading.Tasks.Dataflow.ISourceBlock<TOutput>.ConsumeMessage : System.Threading.Tasks.Dataflow.DataflowMessageHeader * System.Threading.Tasks.Dataflow.ITargetBlock<'Output> * bool -> 'Output

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

參數

傳回

消費訊息的價值。 這可能對應於先前保留並傳遞DataflowMessageHeader給 messageHeader的另一個ConsumeMessage(DataflowMessageHeader, ITargetBlock<TOutput>, Boolean)實例。 消費 ITargetBlock<TInput> 端必須使用回傳的值，而非透過 OfferMessage 傳遞的 messageValue 值 ITargetBlock<TInput>.OfferMessage(DataflowMessageHeader, TInput, ISourceBlock<TInput>, Boolean)

若請求訊息不可用，回傳值為 null。

實作

例外狀況

備註

只有 ITargetBlock<TInput> 與此 ISourceBlock<TOutput> 實例連結的實例才能使用 ConsumeMessage，且必須僅用於消耗 DataflowMessageHeader 該來源先前提供給目標的實例。