Forms.Timer，Timers.Timer，Threading.Timer的区别有哪些

Windows.Forms System.Timers System.Threading
Timer event runs on what thread? UI thread UI or worker thread Worker thread
Instances are thread safe? No Yes No
Familiar/intuitive object model? Yes Yes No
Requires Windows Forms? Yes No No
Metronome-quality beat? No Yes Yes
Timer event supports state object? No No Yes
Initial timer event schedulable? No No Yes
Class supports inheritance? Yes Yes No