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I am getting an exception:
Exception information:
Exception type: FaultException
Exception message: System.ArgumentOutOfRangeException
while calling my FS4SP web service. It runs fine for small queries but fails when my search criteria becomes large (2000+ characters). Does FS4SP has a limitation on search criteria? My QueryText in in STRING format.
As you have seen, the limit for the Query is actually 2048 characters. So any more than that will throw this exception.
https://stackoverflow.com/questions/8061330/how-to-overcome-fast-search-char-limitation-2048 is a possible duplicate of your question, but sadly it never recieved any attention.
Also this from Technet http://social.technet.microsoft.com/Forums/en-US/fastsharepoint/thread/b193fc10-3c39-43d3-9e4a-378ff90125f2 with some answers and approaches
