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C# double question mark (??) syntax

10 Dec 2010, 15:28   Subscribe to Richies blog (RSS)

Thought I'd share something that I learned today about C#.
Been using it nearly 10 years, and didn't know about the ?? syntax!


a = b ?? c;


a will be assigned the value of b if b is not null. If b is null, a will be assigned the value of c.

i.e. its shorthand for:
if (b == null) a = c else a = b


Not earth shattering, but a nice time saver, and it follows the same theme of a question mark indicating the null option on system type declarations, like int?, date? etc..




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Posted10 Dec 2010, 15:28

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Shelley posted this comment on 17 Dec 2010, 21:20    (Comment updated on: 17 Dec 2010, 21:20)    
Thanks, great explanation!
    
 

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