ArrayList 的 IComparer排序

例子　１：

public class comper : IComparer
        {
            int IComparer.Compare(object a, object b)
            {
                float flotA = 0, flotB = 0;
                bool isFloat = float.TryParse(a.ToString(), out flotA) && float.TryParse(b.ToString(), out flotB);
                if (!isFloat)
                {
                    return string.Compare(a.ToString(), b.ToString(), false);
                }
                else
                {
                    return   flotA == flotB ? 0 : (flotA>flotB?1:-1);
                }
            }
        }
调用

 

 ArrayList tList = new ArrayList();
 IComparer myComperMethod = new comper();
 tList.Sort(myComperMethod);

 

例子　２：

C# code
public class EmployeeInfo
{
    public String _Name;
    public int _Age;
    public EmployeeInfo(String _Name, int _Age)
    {
        this._Name = _Name;
        this._Age = _Age;
    }

    public string Name
    {
        get { return _Name; }
        set { _Name = value; }
    }

    public int Age
    {
        get { return _Age; }
        set { _Age = value; }
    }
}





C# code
using System;
using System.Collections;
using System.Reflection;

public class Mycomparator : IComparer
{
    public Mycomparator(){ }

    int IComparer.Compare(Object o1, Object o2)
    {
        EmployeeInfo e1 = (EmployeeInfo)o1;
        EmployeeInfo e2 = (EmployeeInfo)o2;
        if (e1.Age < e2.Age)
            return 1;
        else if (e1.Age > e2.Age)
            return -1;
        else
            return 0;
    }

    public static IComparer sortAgeAscending()
    {
        return (IComparer)new Mycomparator();
    }
}





C# code
EmployeeInfo[] arra = new EmployeeInfo[]
{
    new EmployeeInfo("张三", 58),
    new EmployeeInfo("李四", 26),
    new EmployeeInfo("王五", 71),
    new EmployeeInfo("赵六", 19)
};

        
Array.Sort(arra, Mycomparator.sortAgeAscending());
string arr = null;
foreach(EmployeeInfo obj in arra)
{
    arr += obj._Name + obj._Age + "<br />";
}
Response.Write(arr);