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using System;
using System.Collections.Generic;
using System.Text;
namespace System.Linq
{
public static class LINQ
{
public static int Count<TSource>(this IEnumerable<TSource> source, Predicate<TSource> predicate)
{
int count = 0;
foreach (var item in source)
{
if (predicate(item))
count++;
}
return count;
}
public static bool Contains<TSource>(this IEnumerable<TSource> source, TSource target)
{
foreach (var item in source)
{
if (item.Equals(target))
return true;
}
return false;
}
public static TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source, Predicate<TSource> predicate)
{
foreach (var item in source)
{
if (predicate(item))
return item;
}
return default(TSource);
}
public static int Sum<TSource>(this IEnumerable<TSource> source, Func<TSource, int> getter)
{
int sum = 0;
foreach (var item in source)
{
sum += getter(item);
}
return sum;
}
public static IEnumerable<TSource> OrderByDescending<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> getter)
where TKey : IComparable<TKey>
{
var items = new List<TSource>();
foreach (var i in source)
{
items.Add(i);
}
items.Sort(new DelegateComparer<TSource, TKey>(getter));
return items;
}
public static TSource[] ToArray<TSource>(this IEnumerable<TSource> source)
{
if (source is TSource[])
return source as TSource[];
var items = new List<TSource>();
foreach (var i in source)
{
items.Add(i);
}
return items.ToArray();
}
}
class DelegateComparer<TSource, TKey> : IComparer<TSource>
where TKey : IComparable<TKey>
{
private Func<TSource, TKey> m_Getter;
public DelegateComparer(Func<TSource, TKey> getter)
{
m_Getter = getter;
}
public int Compare(TSource x, TSource y)
{
return m_Getter(x).CompareTo(m_Getter(y));
}
}
}
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