在List中找出最大值的两种方法

1   private class A
2         {
3             public int ID { get; set; }
4 
5             public string Name { get; set; }
6         }

1         private static TimeSpan compare = new TimeSpan();
2         private static TimeSpan order = new TimeSpan();

1         private static void MaxByOrder(List<A> list)
2         {
3             DateTime start = DateTime.Now;
4             A max = list.OrderByDescending(i => i.ID).First();
5             TimeSpan span = DateTime.Now - start;
6             order += span;
7             Console.WriteLine(max.Name + "  Order:" + span);
8         }

1   private static void Max(List<A> list)
2         {
3             DateTime start = DateTime.Now;
4             int maxID = list.Max(m => m.ID);
5             A max = list.First(i => i.ID == maxID);
6             TimeSpan span = DateTime.Now - start;
7             compare += span;
8             Console.WriteLine(max.Name + "  Compare:" + span);
9         }

 1         private static void Main(string[] args)
 2         {
 3             List<A> list = new List<A>();
 4             list = Enumerable.Range(1, 10000000).Select(n => new A { ID = n, Name = n.ToString() }).ToList();
 5             Console.WriteLine("print");
 6             int i = 0;
 7             while (i < 100)
 8             {
 9                 MaxByOrder(list);
10                 Max(list);
11                 i++;
12             }
13             Console.WriteLine("Compare:" + compare);
14             Console.WriteLine("Order:" + order);
15             Console.ReadLine();
16         }