Используем C# опреатор yield, Эпизод 2

C#-Code:

using System;
using System.Collections.Generic; 


namespace BlendWorld.YieldOperatorEpisode2
{
    public static class LinqExtensions
    {
        public static IEnumerable<T> YieldWhere<T>(this IEnumerable<T> source, Predicate<T> selector)
        {
            foreach (var item in source)
            {
                if (selector(item))
                {
                    yield return item;
                }
                else
                {
                    yield break;
                }
            }
        }
    }
}

C#-Code:

using System.Diagnostics;
using Microsoft.VisualStudio.TestTools.UnitTesting; 


namespace BlendWorld.YieldOperatorEpisode2.Test
{
    [TestClass]
    public class LinqExtensionsTests
    {
        private readonly int[] array = {0, 1, 2, 2, 5, 10, 7, 4, 3, 5, 11}; 


        [TestMethod]
        public void TestMethod1()
        {
            foreach (var item in array.YieldWhere(f=> f < 10))
            {
                Debug.WriteLine(string.Format("Item = {0}", item));
            }
        }
    }
}