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Simple technique for avoiding infinite loops that often come up in event-based programming.

Simple technique for avoiding infinite loops that often come up in event-based programming.

Rate Simple technique for avoiding infinite loops that often come up in event-based programming.

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(1(1 Vote))

loops is the following:

Public Sub MySub()
  CallSomething '<- This method call somehow fires MySub Again, so we get an infinite loop
End Sub

Rewrite like this:

'Module level variable: 
Private mbMySubCalled as boolean 'Make sure this gets initialized to false

Public Sub MySub()
  If mbMySubCalled = True then
     mbMySubCalled = False
     Exit sub
  else
     mbMySubCalled = True
  end if

  CallSomething
End Sub

What you've basically done is set a flag the first time the sub gets called.  The second time in, you look at that flag, if its set, unset it and exit.  If not, set it and continue.