A KING AIR PLT'S RPT ON A C172'S ENTRY PATTERN AND FAILURE TO GIVE RIGHT-OF-WAY WHILE ON APCH TO JYO; VA.

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ON AN IFR FLT PLAN TO JYO. I WAS TRACKING INBOUND ON LOC 17; CALLED ARPT IN SIGHT TO ATC AT APPROX 6.5 NM FROM RWY THRESHOLD. ATC CLRED US FOR CHANGE TO ADVISORY WITH A 'NO TFC BTWN YOU AND ARPT OR TFC PATTERN OBSERVED' ADVISORY. AT 5.5 NM I CANCELED IFR. I HAD ALREADY BEEN MAKING CALLS AND MONITORING UNICOM SINCE 25 NM OUT WITH NO RESPONSE TO MY POS/INTENTION CALLS. SINCE WE WERE NEAR IAD (9 NM) AND ON LOC 17 AND AT VERY CLOSE RANGE (ON FINAL) FOR RWY 17; WE ELECTED TO CONTINUE WITH OUR STRAIGHT-IN APCH. WE CALLED 4.5 NM FINAL AND AT THAT MOMENT; JUST AFTER OUR CALL; AN ACFT CALLED 'TURNING BASE RWY 17.' I IMMEDIATELY STARTED LOOKING FOR ACFT WHILE ADVISING ON UNICOM OF OUR 4.5 NM POS. WE ACQUIRED THE TFC MAKING A 'SHORT APCH' TIGHT OVER THE THRESHOLD OF RWY AS IF HE WANTED TO 'SQUEEZE IN' BEFORE US. AS WE PREPARED FOR A BALKED LNDG; THE ACFT ABANDONED THE LNDG APCH WITH A GAR. THE PLT OF OTHER ACFT (APPEARED TO BE A HIGH WING CESSNA) PROCEEDED TO COMPLAIN TO US ON UNICOM WHILE WE CONTINUED WITH OUR LNDG AND POST-LNDG PROCS. WE MAINTAINED RADIO SILENCE AFTER EXITING THE RWY (TO NOT CREATE FREQ CONGESTION WITH NON TFC COMS). I EXPECTED TO MEET THE OTHER PLT FOR A POSSIBLE DEBRIEF AT THE FBO BUT HE NEVER SHOWED UP DURING THE 50 MINS WE SPENT IN THE LOBBY. AT NO POINT WAS OUR ACFT IN DANGER OF COLLISION. WE WERE EXERCISING ACTIVE SCANNING AND ACQUIRED TFC WITH AMPLE TIME FOR MANEUVERING. WE LANDED NORMALLY ON OUR APCH.