Question

I have a small thing.

public int GetSum(List<int> x)
{
    foreach (int i in x) sum += i;

return sum;

}

where x is a List of integers defined as

List<int> l = new List<int>();
            l.Add(4); l.Add(2); l.Add(5); l.Add(8); l.Add(6);

and has been passed as GetSum(l)

Is it possible to rewrite the above foreach loop using a lambda?

Reason: I started looking into the lambda stuffs since yesterday and is interested to learn .. however simple it may be.

Thanks.

Answer 1

LINQ already has a Sum extension method:

list.Sum();

You can rewrite your GetSum method using C# 2.0’s List<T>.ForEach method, like this:

public int GetSum(List<int> x) {
    int sum;
    x.ForEach(i => sum += i);   
    return sum;
}