Determines whether the ServiceStreamer<TStreamedData,TServiceState> should continue streaming by calling the OnCallService method.
currentStreamNumber
The number of the current concurrent stream to process.
state
User state information.
true to continue streaming; otherwise false.
This function will be called before calling the OnCallService method.
When you receive all the data from the web service and you don't need to perform further streaming, return false from this method. For example, if you set the StreamsLimit to 4 and you have received all data in the 3rd call, then return false when the currentStreamNumber is 4.