C# (CSharp) MoreEnumerable.FirstOrDefault示例

示例#1

            public void WithEmptySourceWithComparerReturnsDefault()
            {
                using var strings = Enumerable.Empty <string>().AsTestingSequence();
                var minima = strings.MinBy(s => s.Length, Comparable <int> .DescendingOrderComparer);

                Assert.That(MoreEnumerable.FirstOrDefault(minima), Is.Null);
            }

示例#2

            public void WithComparerReturnsMinimum()
            {
                using var strings = SampleData.Strings.AsTestingSequence();
                var minima = strings.MinBy(s => s.Length, Comparable <int> .DescendingOrderComparer);

                Assert.That(MoreEnumerable.FirstOrDefault(minima), Is.EqualTo("hello"));
            }

示例#3

            public void WithEmptySourceReturnsDefault()
            {
                using var strings = Enumerable.Empty <string>().AsTestingSequence();
                var minima = strings.MinBy(s => s.Length);

                Assert.That(MoreEnumerable.FirstOrDefault(minima), Is.Null);
            }

示例#4

            public void ReturnsMinimum()
            {
                using var strings = SampleData.Strings.AsTestingSequence();
                var minima = strings.MinBy(s => s.Length);

                Assert.That(MoreEnumerable.FirstOrDefault(minima), Is.EqualTo("ax"));
            }