C# 之委託學習（2）

一個很經典的學習C# 委託的例子跟大家分享一下，希望對大家有點協助，直接看代碼：

BubbleSorter.cs

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;
               }
            }
         }
      }
   }
}

Employee.cs

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);
      }
   }

}

Program.cs

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方法執行個體化一個委託。

         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());
      }
   }
}