JoinBlock<T1,T2>.ISourceBlock<Tuple<T1,T2>>.ReserveMessage Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Reserves the right to pass the ownership of the message identified by the DataflowMessageHeader from this ISourceBlock<TOutput> to the ITargetBlock<TInput>.
virtual bool System.Threading.Tasks.Dataflow.ISourceBlock<System.Tuple<T1,T2>>.ReserveMessage(System::Threading::Tasks::Dataflow::DataflowMessageHeader messageHeader, System::Threading::Tasks::Dataflow::ITargetBlock<Tuple<T1, T2> ^> ^ target) = System::Threading::Tasks::Dataflow::ISourceBlock<Tuple<T1, T2> ^>::ReserveMessage;
bool ISourceBlock<Tuple<T1,T2>>.ReserveMessage (System.Threading.Tasks.Dataflow.DataflowMessageHeader messageHeader, System.Threading.Tasks.Dataflow.ITargetBlock<Tuple<T1,T2>> target);
abstract member System.Threading.Tasks.Dataflow.ISourceBlock<System.Tuple<T1,T2>>.ReserveMessage : System.Threading.Tasks.Dataflow.DataflowMessageHeader * System.Threading.Tasks.Dataflow.ITargetBlock<'T1 * 'T2> -> bool
override this.System.Threading.Tasks.Dataflow.ISourceBlock<System.Tuple<T1,T2>>.ReserveMessage : System.Threading.Tasks.Dataflow.DataflowMessageHeader * System.Threading.Tasks.Dataflow.ITargetBlock<'T1 * 'T2> -> bool
Function ReserveMessage (messageHeader As DataflowMessageHeader, target As ITargetBlock(Of Tuple(Of T1, T2))) As Boolean Implements ISourceBlock(Of Tuple(Of T1, T2)).ReserveMessage
Parameters
- messageHeader
- DataflowMessageHeader
The DataflowMessageHeader of the message that is to be reserved.
- target
- ITargetBlock<Tuple<T1,T2>>
The ITargetBlock<TInput> for which the message is to be reserved.
Returns
true
if the message was successfully reserved; otherwise, false
.
Implements
Exceptions
The messageHeader
is not valid.
The target
is null
(Nothing in Visual Basic).
Remarks
The ITargetBlock<TInput> for which the message is to be reserved need not be linked from this ISourceBlock<TOutput> instance. Moreover, this ISourceBlock<TOutput> instance may have never offered the message directly to the ITargetBlock<TInput>.
If true
is returned, you must subsequently call either ConsumeMessage or ReleaseReservation for this message with the same DataflowMessageHeader and ITargetBlock<TInput>. If you don't, the source may be unable to propagate any further messages to any target.
Don't call ReserveMessage while the target is holding any internal locks. Doing so will violate the lock hierarchy necessary to avoid deadlocks in a dataflow network.
Applies to
.NET
피드백
https://aka.ms/ContentUserFeedback
출시 예정: 2024년 내내 콘텐츠에 대한 피드백 메커니즘으로 GitHub 문제를 단계적으로 폐지하고 이를 새로운 피드백 시스템으로 바꿀 예정입니다. 자세한 내용은 다음을 참조하세요.다음에 대한 사용자 의견 제출 및 보기