Double-mapped delegate

  • Thread starter Thread starter Jon Davis
  • Start date Start date
J

Jon Davis

If two delegates are created that point to the exact same method, and an
event is assigned both delegates, ...

myObj.MyEvent += new EventHandler(MyHandler);
myObj.MyEvent += new EventHandler(MyHandler);

.... does it recognize the duplicate method and ignore the second one, or
does it execute the same method twice when raised?

Jon
 
Even easier to ask. ;)

Jon

Nicholas Paldino said:
Jon,

Just a side note, this is very easy to test...

--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Jon Davis said:
If two delegates are created that point to the exact same method, and an
event is assigned both delegates, ...

myObj.MyEvent += new EventHandler(MyHandler);
myObj.MyEvent += new EventHandler(MyHandler);

... does it recognize the duplicate method and ignore the second one, or
does it execute the same method twice when raised?

Jon
Click to expand...
Click to expand...
 
You can check whether a delegate contains a given event handler by
iterating
over the return value of GetInvocationList and using the overridden equality
operator (==) to check. <<

This is an excellent and very relevant answer, Simon, thank you very much!

Jon
 
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