这是咱们C# 开发交流群里好友昨天提的问题：
主要是从txt文件中删除重复的邮箱号
以下是实现的代码：
代码语言：javascript复制using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
string dataPath = @"C:UsersadminDesktop111";
public void FileReadWriter(string filePath)
{
if (Directory.Exists(filePath))
{
string[] filenames = Directory.GetFiles(filePath);
foreach (string fname in filenames)
{
FileInfo finfo = new FileInfo(fname);
List<string> posts = new List<string>();
if (finfo.Name.Substring(finfo.Name.Length - 4, 4) == ".txt")
{
foreach (string str in File.ReadAllLines(finfo.FullName, Encoding.Default))
{
posts.Add(str);
}
HashSet<string> hs = new HashSet<string>(posts);//此时已经去掉重复的数据保存在hashset中 方法1
posts = posts.Distinct().ToList();// 方法2
StreamWriter sw = new StreamWriter(finfo.FullName, false);
foreach (var post in posts) //方法1
{
sw.WriteLine(post);
}
//foreach (var post in hs)//方法2
//{
// sw.WriteLine(post);
//}
sw.Close();
}
}
}
}
public void FileWriter(string filePath)
{
}
private void button1_Click(object sender, EventArgs e)
{
FileReadWriter(dataPath);
MessageBox.Show("文件去重完成");
}
}
}
运行效果：
