/
Aggregate.cs
86 lines (71 loc) · 2.58 KB
/
Aggregate.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
namespace System.Linq
{
public static partial class Enumerable
{
public static TSource Aggregate<TSource>(this IEnumerable<TSource> source, Func<TSource, TSource, TSource> func)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
if (func == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.func);
}
using (IEnumerator<TSource> e = source.GetEnumerator())
{
if (!e.MoveNext())
{
ThrowHelper.ThrowNoElementsException();
}
TSource result = e.Current;
while (e.MoveNext())
{
result = func(result, e.Current);
}
return result;
}
}
public static TAccumulate Aggregate<TSource, TAccumulate>(this IEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> func)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
if (func == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.func);
}
TAccumulate result = seed;
foreach (TSource element in source)
{
result = func(result, element);
}
return result;
}
public static TResult Aggregate<TSource, TAccumulate, TResult>(this IEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> func, Func<TAccumulate, TResult> resultSelector)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
if (func == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.func);
}
if (resultSelector == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.resultSelector);
}
TAccumulate result = seed;
foreach (TSource element in source)
{
result = func(result, element);
}
return resultSelector(result);
}
}
}