Enumerable Range, C#

Enumerable Range

//C# 'Hello, world'
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            const int PivotValue = 1;
            const int RangeSize = 1;

int[] enumerable = new[] { 0, 1, 2, 3, 4, 5, 600, 700, 800, 900, 1000 };

IEnumerable<int> range = enumerable.PivotRange(PivotValue, RangeSize);
            Console.WriteLine(String.Join(",",range.ToArray()));
        }
    }
    
    public static class EnumerableExtensions
    {
        public static IEnumerable<T> PivotRange<T>(this IEnumerable<T> source, T pivot, int size) where T : IComparable<T>
        {
            T[] left = new T[size];
            int lCount = 0, rCount = 0;
            IEnumerator<T> enumerator = source.GetEnumerator();
        
            while (enumerator.MoveNext())
            {
                T item = enumerator.Current;
        
                if (item.CompareTo(pivot) == 0)
                {
                    int start = lCount > size ? lCount % size : 0;
                    int end = Math.Min(size, lCount);
        
                    for (int i = start; i < start + end; i++)
                        yield return left[i % size];
        
                    yield return pivot;
        
                    while (enumerator.MoveNext() && rCount++ < size)
                        yield return enumerator.Current;
        
                    break;
                }
        
                if (size <= 0) continue;
        
                left[lCount++ % size] = item;
            }
        }
    }
    
}


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