linkerro linkerro - 1 year ago 73
C# Question

null conditional operator not working with nullable types?

I'm writing a piece of code in c#6 and for some strange reason this works

var value = objectThatMayBeNull?.property;

but this doesn't:

int value = nullableInt?.Value;

By not works I mean I get a compile error saying
Cannot resolve symbol 'Value'
Any idea why the null conditional operator
isn't working?

Answer Source

Okay, I have done some thinking and testing. This is what happens:

int value = nullableInt?.Value;

Gives this error message when compiling:

Type 'int' does not contain a definition for `Value'

That means that ? 'converts' the int? into the actual int value. This is effectively the same as:

int value = nullableInt ?? default(int);

The result is an integer, which doesn't have a Value, obviously.

Okay, might this help?

int value = nullableInt?;

No, that syntax isn't allowed.

So what then? Just keep using .GetValueOrDefault() for this case.

int value = nullableInt.GetValueOrDefault();
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