Sum of TimeSpans in C#

Question

I have a collection of objects that include a TimeSpan variable:

MyObject
{ 
    TimeSpan TheDuration { get; set; }
}

I want to use LINQ to

Answer 1

You can use .Aggregate rather than .Sum, and pass it a timespan-summing function that you write, like this:

    TimeSpan AddTimeSpans(TimeSpan a, TimeSpan b)
    {
        return a + b;
    }

Answer 2

This works well (code based on Ani's answer)

public static class StatisticExtensions
{    
    public static TimeSpan Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, TimeSpan> selector)
    {
        return source.Select(selector).Aggregate(TimeSpan.Zero, (t1, t2) => t1 + t2);
    }
}

Usage :

If Periods is a list of objects with a Duration property

TimeSpan total = Periods.Sum(s => s.Duration)