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C# pattern to prevent an event handler hooked twice [duplicate]

...ed from the public event to the private delegate, e.g. Foo?.Invoke() would now become foo?.Invoke(). Otherwise you get an error. – toddmo Oct 19 '17 at 16:19 ...
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How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?

... just a side note for those who dont know, we start adding arguments from index 2 because index 0 and 1 are reserved for hidden arguments "self" and "_cmd". – Vishal Singh May 15 '13 at 6:20 ...
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Set selected index of an Android RadioGroup

...e RadioButtons are added to the radioGroup instead of the layout } } Now Check a button using, int radio_button_Id = radioGroup.getChildAt(index).getId(); radioGroup.check( radio_button_Id ); share | ...
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Excel VBA App stops spontaneously with message “Code execution has been halted”

... Does anyone know why this works? Or where it comes from? Is this magic? – ZX9 Aug 13 '15 at 18:00 3 ...
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What should I do if two libraries provide a function with the same name generating a conflict?

...: edit one to change the name and recompile Or equivalently see Ben and unknown's answers which will work without access to the source code. If you don't control either of them you can wrap one of them up. That is compile another (statically linked!) library that does nothing except re-export all th...
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What is the purpose of a question mark after a type (for example: int? myVariable)?

... Thank you for the explanation. I understand now. – problemofficer Jul 1 '17 at 3:59 add a comment  |  ...
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Regex to validate password strength

...ed to include your test case @PriyankBolia. See new robulink, which should now work. – lsu_guy Sep 18 at 19:56 add a comment  |  ...
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Spring @Transaction method call by the method within the same class, does not work?

... Thank you for the information. I refactored the code for now, but could you please send me an example using AspectJ or provide me with some helpful links. Thanks in advance. Mike. – Mike Aug 9 '10 at 16:54 ...
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How to check if a process id (PID) exists

...s -p $PID > /dev/null then echo "$PID is running" # Do something knowing the pid exists, i.e. the process with $PID is running fi The problem with: kill -0 $PID is the exit code will be non-zero even if the pid is running and you dont have permission to kill it. For example: kill -0 1...
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How to get last key in an array?

...ings when the function parameter was passed by reference. The warning will now always be issued." – Dominic Scheirlinck Jan 18 '16 at 1:05 ...