C# 之委托学习（2）

一个很经典的学习C# 委托的例子跟大家分享一下，希望对大家有点帮助，直接看代码：

using System;
using System.Collections.Generic;
using System.Text;

namespace Wrox.ProCSharp.Delegates
{
   delegate bool Comparison(object x, object y);

   class BubbleSorter
   {
      static public void Sort(object[] sortArray, Comparison comparer)
      {
         for (int i = 0; i < sortArray.Length; i++)
         {
            for (int j = i + 1; j < sortArray.Length; j++)
            {
               if (comparer(sortArray[j], sortArray[i]))
               {
                  object temp = sortArray[i];
                  sortArray[i] = sortArray[j];
                  sortArray[j] = temp;
               }
            }
         }
      }
   }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace Wrox.ProCSharp.Delegates
{
   class Employee
   {
      private string name;
      private decimal salary;

      public Employee(string name, decimal salary)
      {
         this.name = name;
         this.salary = salary;
      }

      public override string ToString()
      {
         return string.Format("{0}, {1:C}", name, salary);
      }

      public static bool CompareSalary(object x, object y)
      {
         Employee e1 = (Employee)x;
         Employee e2 = (Employee)y;
         return (e1.salary < e2.salary);
      }
   }

}

using System;
using System.Collections.Generic;
using System.Text;

namespace Wrox.ProCSharp.Delegates
{

   class Program
   {
      static void Main()
      {
         Employee[] employees =
         {
           new Employee("Bugs Bunny", 20000),
           new Employee("Elmer Fudd", 10000),
           new Employee("Daffy Duck", 25000),
           new Employee("Wiley Coyote", (decimal)1000000.38),
           new Employee("Foghorn Leghorn", 23000),
           new Employee("RoadRunner'", 50000)};

         // Comparison comp = Employee.CompareSalary; //用Employee.CompareSalary方法实例化一个委托。

         BubbleSorter.Sort(employees, Employee.CompareSalary);

         foreach (var employee in employees)
         {
            Console.WriteLine(employee);
         }
         Console.ReadLine();
         //for (int i = 0; i < employees.Length; i++)
         //   Console.WriteLine(employees[i].ToString());
      }
   }
}