Sum TimeSpan array with a one-liner?

Question

Is there a way to aggregate multiple aggregates to 1 time span?

Dim times = { 
  New TimeSpan(1, 0, 0),
  New TimeSpan(1, 10, 0),
  New TimeSpan(1, 50, 0),
  New TimeSpan(0, 20, 0),
  New TimeSpan(0, 10, 0)
}

Dim sum As New TimeSpan
For Each ts In times
  sum = sum.Add(ts)
Next

'That's what I desire:
sum = times.Sum
sum = times.Aggregate

I am looking for some built in capability I don't know about.

Update Please read my comment on Reed Copsey's answer.

Answer 1

You have the answer there - just use TimeSpan.Add.

You can do the collection using LINQ's Enumerable.Aggregate if you want to avoid the loop:

Dim sum as TimeSpan
sum = times.Aggregate(Function(ByVal current, ByVal ts) ts.Add(current) )

---

Edit: If you want an extension method to do this, you could do:

''
<Extension()> 
Public Function Aggregate(ByVal IEnumerable(Of TimeSpan) times) As TimeSpan
     Return times.Aggregate(Function(ByVal current, ByVal ts) ts.Add(current) )
End Function

Answer 2

You need to sum TimeSpan.Ticks then create a new TimeSpan with that value

Dim times = 
{ 
    New TimeSpan(1, 0, 0), 
    New TimeSpan(1, 10, 0), 
    New TimeSpan(1, 50, 0), 
    New TimeSpan(0, 20, 0), 
    New TimeSpan(0, 10, 0) 
}

Dim sumTicks As Long = 0
For Each ts In times
    sumTicks += ts.Ticks
Next

Dim sum As New TimeSpan(sumTicks)

Answer 3

C#:

TimeSpan sum = times.Aggregate((t1, t2) => t1.Add(t2));

VB.NET:

Dim sum As TimeSpan = times.Aggregate(Function(t1, t2) t1.Add(t2))

Answer 4

Sure.

Enumerable.Aggregate just needs a Func<T, T, T> -- something that takes two T objects and aggregates them in some way to product a new T. So you can go with Yuriy's method:

// The + operator is defined for TimeSpan, so you're fine just using that.
TimeSpan sum = times.Aggregate((t1, t2) => t1 + t2);

Or, you can also do something like what Tim Coker suggested, using the Enumerable.Sum extension method:

TimeSpan sum = TimeSpan.FromTicks(times.Sum(t => t.Ticks));

Update: Here are the VB.NET equivalents:

Dim sum = times.Aggregate(Function(t1, t2) t1 + t2)

Dim sum = TimeSpan.FromTicks(times.Sum(Function(t) t.Ticks))

Answer 5

You can use the Sum method to add the Ticks value from each TimeSpan:

Dim times = { _
  New TimeSpan(1, 0, 0), _
  New TimeSpan(1, 10, 0), _
  New TimeSpan(1, 50, 0), _
  New TimeSpan(0, 20, 0), _
  New TimeSpan(0, 10, 0) _
}

Dim t As New TimeSpan(times.Sum(Function(t) t.Ticks))