给你个简单的参考：

var query = dataContext.User.OrderByDescending(o => o.UserID).Take(10).Where(m=> m.IsChina == true);

你可以参考下如下例子：

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace OrderOperation
{
    public class Products
    {
        public int Id { get; set; }
        public int CategoryId { get; set; }
        public string Name { get; set; }
        public double Price { get; set; }
        public DateTime CreateTime { get; set; }
    }
    class Program
    {
        static void Main(string[] args)
        {
            // 初始化数据
            List<Products> listProduct = new List<Products>()
            {
               new Products(){Id=1, CategoryId=1, Name="C#高级编程第10版", Price=100.67, CreateTime=DateTime.Now},
               new Products(){Id=2, CategoryId=1, Name="Redis开发和运维", Price=69.9, CreateTime=DateTime.Now.AddDays(-19)},
               new Products(){Id=3, CategoryId=1, Name="ASP.NET Core", Price=57, CreateTime=DateTime.Now.AddMonths(-3)},
               new Products(){Id=4, CategoryId=1, Name="Entity Framework 6.x", Price=97, CreateTime=DateTime.Now.AddMonths(-1)}
            };
            Console.WriteLine("方法语法");
            // 1、查询方法，返回匿名类
            var list = listProduct.OrderByDescending(p => p.CreateTime).Select(p => new { id = p.Id, ProductName = p.Name, ProductPrice = p.Price, PublishTime = p.CreateTime }).ToList();
            foreach (var item in list)
            {
                Console.WriteLine("item:{0}", item);
            }
            Console.WriteLine("查询表达式");
            // 2、查询表达式,返回匿名类
            var listExpress = from p in listProduct orderby p.CreateTime descending select new { id = p.Id, ProductName = p.Name, ProductPrice = p.Price, PublishTime = p.CreateTime };
            foreach (var item in listExpress)
            {
                Console.WriteLine("item:{0}", item);
            }
            Console.ReadKey();
        }
    }
}