linqとか比較しながらselectとか

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication3 {
	class Program {
		static void Main(string[] args) {
			var src = LinqExtension.RandomSource(10).Take(10).ToArray();
			src.Print();
			src.CompareSelect((x, y) => x < y).Print();
			//[7,4,8,6,7,4,5,9,4,9,]
			//[False,True,False,True,False,True,True,False,True,]
			
			Console.Read();
		}
	}
	static class LinqExtension {
		public static IEnumerable<int> RandomSource(int max = int.MaxValue) {
			var r = new Random();
			while (true) {
				yield return r.Next(max);
			}
		}

		public static IEnumerable<U> CompareSelect<T, U>(this IEnumerable<T> src, Func<T, T, U> selector) {
			return src.Zip(src.Skip(1), (x1, x2) => new { X1 = x1, X2 = x2 }).Select(x => selector(x.X1, x.X2));
		}

		public static IEnumerable<T> Print<T>(this IEnumerable<T> src) {
			Console.Write("[");
			foreach (var item in src) {
				Console.Write("{0},", item);
			}
			Console.WriteLine("]");
			return src;
		}
	}
}