Question

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What do two question marks together mean in C#?

I just came across the code below and not really sure what it means and can’t google it because google omits the ??

int? x = 32;
int  y = x ?? 5;

Is the second line some sort of if else statement, what does the ?? mean

Answer 1

It’s called the null-coalescing operator.

If the value to the left of the ?? is null, then use the value to the right of the ?? otherwise use the left hand value.

Expanded out:

y = x == null ? 5 : x

or

if(x == null)
     y = 5
else
     y = x