经典的委托排序(深入分析)

对于数值型的排序我们都已经司空见惯了，但我们有时候希望我们的Sort()方法能够给任何对象排序，比如某段客户机代码包含Currency结构数组或其他的类和结构，就需要对该数组排序。这里我们使用委托并封装这个方法进行比较。

排序我们还是使用经典的冒泡排序，如果数据量较大你可以换为你自己的更高效的排序算法。

先给出整个代码：

复制代码 代码如下:

public class BubbleSorter
{
 public static void Sort(object[] sortArray, CompareOperation gtMethod)
 {
  for (int i = 0; i < sortArray.Length; i++)
  {
   for (int j = 0; j < sortArray.Length; j++)
   {
    if (gtMethod(sortArray[j], sortArray[i]))
    {
     object tmp = sortArray[i];
     sortArray[i] = sortArray[j];
     sortArray[j] = tmp;
    }
   }
  }
 }
}
public 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(name.PadRight(20) + "{0:C}", salary);
 }
 public static bool RSalaryIsGreater(object lObj, object rObj)
 {
  Employee lEmployee = lObj as Employee;
  Employee rEmployee = rObj as Employee;
  return rEmployee.salary > lEmployee.salary;
 }
}

再给一个调用示例：

复制代码 代码如下:

public delegate bool CompareOperation(object lObj, object rObj);
class Program
{
 static void Main(string[] args)
 {
  Employee[] employees =
  {
   new Employee("Tommy",20000),
   new Employee("Elmer",10000),
   new Employee("Daffy", 25000),
   new Employee("Wiley",1000000),
   new Employee("Foghorn",23000),
   new Employee("RoadRunner",50000),
  };
  CompareOperation employeeCompareOperation = new CompareOperation(Employee.RSalaryIsGreater);
  BubbleSorter.Sort(employees, employeeCompareOperation);
  for (int i = 0; i < employees.Length; i++)
  {
   Console.WriteLine(employees[i].ToString());
  }
 }
}