Is there a more elegant way to add nullable ints?

Question

I need to add numerous variables of type nullable int. I used the null coalescing operator to get it down to one variable per line, but I have a feeling there is a more concise way to do this, e.g. can't I chain these statements together somehow, I've seen that before in other code.

using System;  namespace TestNullInts {     class Program     {         static void Main(string[] args)         {             int? sum1 = 1;             int? sum2 = null;             int? sum3 = 3;              //int total = sum1 + sum2 + sum3;             //int total = sum1.Value + sum2.Value + sum3.Value;              int total = 0;             total = total + sum1 ?? total;             total = total + sum2 ?? total;             total = total + sum3 ?? total;              Console.WriteLine(total);             Console.ReadLine();         }     } } 

Answer 1

var nums = new int?[] {1, null, 3}; var total = nums.Sum(); 

This relies on the IEnumerable<Nullable<Int32>>overload of the Enumerable.Sum Method, which behaves as you would expect.

If you have a default-value that is not equal to zero, you can do:

var total = nums.Sum(i => i.GetValueOrDefault(myDefaultValue)); 

or the shorthand:

var total = nums.Sum(i => i ?? myDefaultValue);

Answer 2

total += sum1.GetValueOrDefault(); 

etc.