今天群里有同学问如何用linq取结果集的行号，查了一下资料，发现linq有很简单的方法可以实现，花了几分钟写了一个测试用例，现记录下来，以备参考：

    /// <summary>

    /// 测试类

    /// </summary>

    public class models

    {

        public int id { set; get; }

        public string Name { set; get; }

        public string Phone { set; get; }

        public string Address { set; get; }

        public DateTime Birthday { set; get; }

        private static int idx { set; get; } = 0;

        public models()

        {

            id = idx++;

            Name = "testName" + id.ToString();

            Phone = "testPhone" + id.ToString();

            Address = "testAddress" + id.ToString();

            Birthday = DateTime.Now.AddHours(id);

        }

    }

下面是实现方法：

            var list = new List<models>();

            list.Add(new models());

            list.Add(new models());

            list.Add(new models());

            list.Add(new models());

            list.Add(new models());

            list.Add(new models());

            var tt = list.OrderBy(p => p.Name).OrderByDescending(p =>p.Birthday).OrderByDescending(p => p.id).Select((p, idx) => new {

                row = idx,

                name = p.Name,

                phone = p.Phone

            });