实现效果：

实现代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
namespace IOTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //目录遍历
            listBox1.Items.Clear();
            DirectoryInfo di = new DirectoryInfo("c:/");
            foreach (DirectoryInfo folder in di.GetDirectories())
            {
                if ((folder.Attributes & FileAttributes.Hidden) != FileAttributes.Hidden && (folder.Attributes & FileAttributes.System) != FileAttributes.System)
                {
                    // Attribute&FileAttributes.Hidden 判断是否为隐藏目录
                    //Attributes & FileAttributes.System 判断是否为系统文件
                    this.listBox1.Items.Add(folder.Name);
                }
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            //遍历文件
            listBox2.Items.Clear();
            DirectoryInfo di = new DirectoryInfo("c:/");
            foreach (FileInfo file in di.GetFiles())
            {
                if ((file.Attributes & FileAttributes.Hidden) != FileAttributes.Hidden && (file.Attributes & FileAttributes.System) != FileAttributes.System)
                {
                    // Attribute&FileAttributes.Hidden 判断是否为隐藏目录
                    //Attributes & FileAttributes.System 判断是否为系统文件
                    this.listBox2.Items.Add(file.Name);
                }
            }
        }
        private void button6_Click(object sender, EventArgs e)
        {
            //创建目录
            if (Directory.Exists(@"c:/test/233"))
            {
                MessageBox.Show("目录已存在");
            }
            else
            {
                Directory.CreateDirectory(@"c:/test/233");
                MessageBox.Show("目录已创建");
            }
        }
        private void button7_Click(object sender, EventArgs e)
        {
            //创建文件
            StreamWriter sw = new StreamWriter("c:/test/text.txt");
            sw.Close();
            MessageBox.Show("文件已创建");
        }
        private void button3_Click(object sender, EventArgs e)
        {
            //文件写入
            StreamWriter sw1 = new StreamWriter("c:/test/text.txt", false, Encoding.GetEncoding("GB2312"));
            sw1.Write(richTextBox1.Text);
            sw1.Close();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            //文件追加写入
            FileStream fs = File.OpenWrite("c:/test/text1.txt");
            Encoding encode = Encoding.UTF8;
            byte[] b = encode.GetBytes(richTextBox2.Text);
            fs.Position = fs.Length;
            fs.Write(b, 0, b.Length);
            fs.Close();
        }
        private void button5_Click(object sender, EventArgs e)
        {
            //文件读取
            StreamReader sr = new StreamReader("c:/test/text1.txt");
            string line;
            while ((line=sr.ReadLine())!=null)
            {
                richTextBox3.Text=line;
            }
        }
    }
}

注意：using system.io;

文件的写入和读取应增加异常处理

原文链接：https://www.idaobin.com/archives/991.html

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