public IEnumerable <Dto.HeartBeat> SendHeartBeat(CancellationToken cancellationToken = default) { CallOptions = CallOptions.WithCancellationToken(cancellationToken); CallContext = new CallContext(CallOptions, CallContextFlags.IgnoreStreamTermination); using (Channel) { IBiz client = Channel.CreateGrpcService <IBiz>(); return(client.SendHeartBeat(CallContext)); } }