C#List的排序和简单去重总结

List集合在开发过程中很常见，经常我们要对该集合进行一系列操作，本文介绍如何将该集合内的元素进行排序，博主制作简单WinForm应用程序进行演示。

首先，我们来看一下c#泛型List提供的Sort方法：
这里有泛型List类的Sort方法的三种形式，分别是
1，不带有任何参数的Sort方法----Sort()；

这种排序List中的元素必须继承IComparable接口，并且要实现IComparable接口中的CompareTo()方法，在CompareTo()方法中要实现比较规则。

Int32和Double都是实现了IComparable接口并重载了CompareTo方法的结构。因此List<int>就可以直接进行排序。

2，带有比较器参数的Sort方法 ----Sort(IComparer<T>)

此种排序方法必须另外写一个额外的比较器类，该类必须实现IComparer接口，因为该接口有用于比较的重载函数Compare,所以我们必须实现它来完成自己希望的比较，例如自己定义一个学生类Student,改类中有ID、姓名、年龄等属性，我们可以选择年龄属性作为排序属性

3，带有比较器参数，可以指定排序范围的Sort方法----Sort(Int32, Int32 IComparer(T))

界面：

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" alt="" />

自己定义的比较器类：

 public class IntCompare:IComparer<int>
    {
        /// <summary>
        /// 自定义比较规则（从大到小）
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <returns></returns>
        public int Compare(int x, int y)
        {
            //假设原来x位于y的前面,由于x<y 索引值变为1，即索引发生了改变所以推理此比较器是从大到小
            if (x < y)
            {
                return ;
            }
            else
            {
                return -;
            }
        }
    }

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication30
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 创建全局数据集合,用来进行一系列比较
        /// </summary>
        List<int> dataList = new List<int>();

        /// <summary>
        /// 窗体加载
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            this.GetData();
        }

        /// <summary>
        /// 构造测试数据
        /// </summary>
        /// <returns></returns>
        private void GetData()
        {
            dataList.Clear();
            Random rm = new Random();
            for (int i = ; i < ; i++)
            {
                this.dataList.Add(rm.Next(, ));
            }
            this.richTextBox1.Text = string.Join(",", this.dataList.ToArray());
        }

        /// <summary>
        /// 刷新
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnRefresh_Click(object sender, EventArgs e)
        {
            this.richTextBox2.Clear();
            this.richTextBox4.Clear();
            this.richTextBox3.Clear();
            this.GetData();
        }

        /// <summary>
        /// 默认排序
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnDefault_Click(object sender, EventArgs e)
        {
            this.dataList.Sort();
            this.richTextBox2.Text = string.Join(",", this.dataList.ToArray());
        }

        /// <summary>
        /// 自定义排序(从大到小)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnCustom_Click(object sender, EventArgs e)
        {
            IntCompare compare = new IntCompare();
            this.dataList.Sort(compare);
            this.richTextBox3.Text = string.Join(",", this.dataList.ToArray());
        }

        /// <summary>
        /// 去重
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnDistinct_Click(object sender, EventArgs e)
        {
            List<int>distinctList= this.dataList.Distinct().ToList();
            this.dataList.Clear();
            this.dataList.AddRange(distinctList);
            this.richTextBox1.Text = string.Join(",", this.dataList.ToArray());           

        }

        /// <summary>
        /// 自定义排序部分排序(从大到小)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            IntCompare compare = new IntCompare();
            //只对索引3开始的2个包括自己进行排序
            this.dataList.Sort(,,compare);
            this.richTextBox4.Text = string.Join(",", this.dataList.ToArray());
        }
    }
}

演示：

源代码下载