linq to entity framework: something like isnull

I have:

a = b.Sum(..开发者_C百科.) + c.Sum(...)

where b,c are entities. The problem is: when at least one of (b.Sum(...), c.Sum(...)) is null then a will be null. I'd like null be treated as 0. How would I do this?

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At least in LINQ2SQL you can cast to int? manually and then handle the null case

a = ((int?)b.Sum(...) + c.Sum(...)).GetValueOrDefault();

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maybe something like this

a = ( b.Sum(...) + c.Sum(...)) ?? 0;

now if the expression is null, a will be 0;

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I think you could use null coelesce for this:

a = (b.Sum(..) + c.Sum(...)) ?? 0;

NOTE: unchecked syntax! not sure what your sums are doing!

Have a look at the following MSDN article: http://msdn.microsoft.com/en-us/library/ms173224.aspx