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using System;
using System.Collections.Generic;
static class Enumerable
{
public static int Sum<TSource> (this IEnumerable<TSource> source, Func<TSource, int> selector)
{
return Sum<TSource, int> (source, (a, b) => a + selector (b));
}
static TR Sum<TA, TR> (this IEnumerable<TA> source, Func<TR, TA, TR> selector)
{
if (source == null)
throw new ArgumentNullException ("source");
if (selector == null)
throw new ArgumentNullException ("selector");
TR total = default (TR);
int counter = 0;
foreach (var element in source) {
total = selector (total, element);
++counter;
}
if (counter == 0)
throw new InvalidOperationException ();
return total;
}
}
class Repro
{
public static int Main ()
{
var sum = new [] { "1", "2", "3", "4", "5", "6", "7" }.Sum ((s) => int.Parse (s));
if (sum != 28)
return 4;
Console.WriteLine (sum);
return 0;
}
}
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