c#中list sort排序

1、List.Sort (泛型 Comparison) 法

 

此方法的参数是Comparison类型,其实是一个包含两个参数的委托,因此使用此方法,我们只需要定义一个委托,其两个参数均为Student类型,在委托实现的方法比较两个Student对象的Age属性即可。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace GenericCompare
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Student> students = new List<Student>();
            students.Add(new Student("001","kenshincui",25));
            students.Add(new Student("002", "miaoer", 23));
            students.Add(new Student("003", "shenjinjuan", 22));
            students.Add(new Student("004", "nieyanxin", 24));
            Console.WriteLine("未进行排序之前:");
            foreach (Student st in students)
            {
                Console.WriteLine(st.No+","+st.Name+","+st.Age+";");
            }
            Console.WriteLine("List.Sort (泛型 Comparison) 排序之后:");
            students.Sort(delegate(Student a, Student b) { return a.Age.CompareTo(b.Age); });
            foreach (Student st in students)
            {
                Console.WriteLine(st.No + "," + st.Name + "," + st.Age + ";");
            }
            Console.ReadKey();
        }
    }
}



2、List.Sort (泛型 IComparer)


此方法需要一个泛型IComparer接口类型,因此只要定义一个类实现此接口然后再调用此方法即可。


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace GenericCompare
{
    class StudentCompare :IComparer<Student>
    {
        public int Compare(Student a, Student b)
        {
            return a.Age.CompareTo(b.Age);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace GenericCompare
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Student> students = new List<Student>();
            students.Add(new Student("001","kenshincui",25));
            students.Add(new Student("002", "miaoer", 23));
            students.Add(new Student("003", "shenjinjuan", 22));
            students.Add(new Student("004", "nieyanxin", 24));
            Console.WriteLine("未进行排序之前:");
            foreach (Student st in students)
            {
                Console.WriteLine(st.No+","+st.Name+","+st.Age+";");
            }
            Console.WriteLine("List.Sort (泛型 IComparer) 排序之后:");
            students.Sort(new StudentCompare());
            foreach (Student st in students)
            {
                Console.WriteLine(st.No + "," + st.Name + "," + st.Age + ";");
            }
            Console.ReadKey();
        }
    }
}




参考资料:  c#中list排序    http://www.studyofnet.com/news/531.html