委托的使用，排序

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

namespace Wrox.ProCSharp.Delegates
{
  class BubbleSorter
  {
    static public void Sort<T>(IList<T> sortArray, Func<T, T, bool> comparison)
    {
      bool swapped = true;
      do
      {
        swapped = false;
        for (int i = 0; i < sortArray.Count - 1; i++)
        {
          if (comparison(sortArray[i + 1], sortArray[i]))
          {
            T temp = sortArray[i];
            sortArray[i] = sortArray[i + 1];
            sortArray[i + 1] = temp;
            swapped = true;
          }
        }
      } while (swapped);
    }
  }
}

 

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

namespace Wrox.ProCSharp.Delegates
{
  class Employee
  {
    public Employee(string name, decimal salary)
    {
      this.Name = name;
      this.Salary = salary;
    }

    public string Name { get; private set; }
    public decimal Salary { get; private set; }

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

    public static bool CompareSalary(Employee e1, Employee e2)
    {
      return e1.Salary < e2.Salary;
    }
  }

}

 

using System;
using System.Collections.Generic;
using System.Linq;
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("Wile Coyote", 1000000.38m),
        new Employee("Foghorn Leghorn", 23000),
        new Employee("RoadRunner", 50000)
      };

      BubbleSorter.Sort(employees, Employee.CompareSalary);

      foreach (var employee in employees)
      {
        Console.WriteLine(employee);
      }
      Console.ReadKey();
    }
  }
}