How can I force the Average function to include null values?

Question

I wrote the following inside my asp.net mvc application:

double d = visits.Average(d=> d.amount);

But the above code ingores any object that is Null, returning an unrealistic result in my case. How can I force the Average function to calculate the average as :

double d = visits.Sum(d=> d.amount)/visit.Count();

Answer 1

So you want null values to be interpreted as 0?

double d = visits.Average(d => d.amount ?? 0);