Validating event with `?`operator

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Validating event with `?`operator

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I was implementing a method to launch the event PropertyChanged of INotifyPropertyChanged. I did the validation of the event in a traditional way, ie with if (PropertyChanged != null). But the VS suggested me a leaner form that is PropertyChanged?.Invoke ( this, new PropertyChangedEventArgs ( propertyName ) );.

It’s obvious that the code is self-explanatory, meaning, "If PropertyChanged is not null, execute the method Invoke". But I wanted to know what this resource is called so I can research more information about it.

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by Filipe Santiago • **341** points · Answer 1 · 2016-12-17T23:23:13+00:00

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It is called "Null-Conditional Operator". More information here:

https://msdn.microsoft.com/en-us/library/dn986595.aspx

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2016/12/18 at 00:36