System.Linq.Tests.LegacyTests.SelectManyTests.ResultSelector C# (CSharp) Метод

        public void ResultSelector()
        {
            StringWithIntArray[] source =
            {
                new StringWithIntArray { name="Prakash", total=new int?[]{1, 2, 3, 4} },
                new StringWithIntArray { name="Bob", total=new int?[]{5, 6} },
                new StringWithIntArray { name="Chris", total=new int?[0] },
                new StringWithIntArray { name=null, total=new int?[]{8, 9} },
                new StringWithIntArray { name="Prakash", total=new int?[]{-10, 100} }
            };
            string[] expected = { "1", "2", "3", "4", "5", "6", "8", "9", "-10", "100" };

            Assert.Equal(expected, source.AsQueryable().SelectMany(e => e.total, (e, f) => f.ToString()));
        }