对List排序

  泛型 List 实现泛型接口 IComparer 排序速度快，效率高，内部使用的排序算法为快速排序。 using System;
using System.Collections.Generic;

namespace ListSort
{
     class Program
    {
         static void Main( string [] args)
        {
             // 初始化List<Obj>
            List < Obj > l = new List < Obj > ();
            l.Add( new Obj( " 1 " , " s " ));
            l.Add( new Obj( " 2 " , " x " ));
            l.Add( new Obj( " 3 " , " h " ));
            l.Add( new Obj( " 4 " , " y " ));
            l.Add( new Obj( " 5 " , " j " ));
            l.Add( new Obj( " 6 " , " r " ));
            l.Add( new Obj( " 7 " , " c " ));
            l.Add( new Obj( " 8 " , " d " ));

             // ----------------------------------------------------------------------------

            Console.WriteLine( " \n- - - 初 始 值 - - - " );

             foreach (Obj o in l)
            {
                Console.WriteLine( " {0} - - - - - {1} " , o.A, o.B);
            }

            Console.WriteLine( " \n- - - - - - - - - - 美 丽 的 分 隔 符 - - - - - - - - - - " );


            Comparer c = new Comparer();
             // 排序
            l.Sort(c);

             // ----------------------------------------------------------------------------

            Console.WriteLine( " \n- - - 排 序 后 1 - - - " );

             foreach (Obj o in l)
            {
                Console.WriteLine( " {0} - - - - - {1} " , o.A, o.B);
            }

            Console.WriteLine( " \n- - - - - - - - - - 美 丽 的 分 隔 符 - - - - - - - - - - " );

             // 再次初始化List<Obj>
            l.Clear();

            l.Add( new Obj( " 1 " , " s " ));
            l.Add( new Obj( " 2 " , " x " ));
            l.Add( new Obj( " 3 " , " h " ));
            l.Add( new Obj( " 4 " , " y " ));
            l.Add( new Obj( " 5 " , " j " ));
            l.Add( new Obj( " 6 " , " r " ));
            l.Add( new Obj( " 7 " , " c " ));
            l.Add( new Obj( " 8 " , " d " ));

             // 更简短的实现方法
            l.Sort(
                 delegate (Obj x, Obj y)
                {
                     if (x == null )
                    {
                         if (y == null )
                        {
                             return 0 ;
                        }
                         else
                        {
                             return - 1 ;
                        }
                    }
                     else if (y == null )
                    {
                         return 1 ;
                    }
                     else
                    {
                         return x.B.CompareTo(y.B);
                    }
                });

             // ----------------------------------------------------------------------------

            Console.WriteLine( " \n- - - 排 序 后 2 - - - " );


             foreach (Obj o in l)
            {
                Console.WriteLine( " {0} - - - - - {1} " , o.A, o.B);
            }

            Console.WriteLine( " \n- - - - - - - - - - 美 丽 的 分 隔 符 - - - - - - - - - - " );

            Console.ReadKey();

        }
    }

     // 实现IComparer接口
     public class Comparer : IComparer < Obj >
    {
         public int Compare(Obj x, Obj y)
        {
             if (x == null )
            {
                 if (y == null )
                {
                     return 0 ;
                }
                 else
                {
                     return - 1 ;
                }
            }
             else if (y == null )
            {
                 return 1 ;
            }
             else
            {
                 return x.B.CompareTo(y.B);
            }
        }
    }

     // 实体类
    [Serializable]
     public class Obj
    {
         private string a;
         private string b;

         public Obj( string _a, string _b)
        {
            a = _a;
            b = _b;
        }

         public string A
        {
             get { return a; }
        }

         public string B
        {
             get { return b; }
        }

    }
}