• C# 文件与目录的基本操作(System.IO)


    1. 文件操作

    image

    /// <summary>
    /// 文件读写操作
    /// 为简化代码供大家学习,暂不考虑捕捉异常
    /// </summary>
    public partial class TestIO : DevComponents.DotNetBar.Office2007Form
    {
        public TestIO()
        {
            InitializeComponent();
        }
     
        /// <summary>
        /// 创建文件
        /// </summary>
        private void btnCreateFile_Click(object sender, EventArgs e)
        {
            string path = Application.StartupPath + @"Test.txt";
            FileStream fs = new FileStream(path, FileMode.Create);
            StreamWriter sw = new StreamWriter(fs);
            sw.WriteLine("This is a test file.");
            sw.WriteLine("This is second line.");
            sw.Close();
            fs.Close();
     
            // 也可以这样创建 StreamWriter
            // StreamWriter sw = File.CreateText(path);
        }
     
        /// <summary>
        /// 读取文件
        /// </summary>
        private void btnReadFile_Click(object sender, EventArgs e)
        {
            string path = Application.StartupPath + "\Test.txt";
            textBoxX1.Text = string.Empty;
            if (File.Exists(path))
            {
                FileStream fs = new FileStream(path, FileMode.Open);
                StreamReader sr = new StreamReader(fs);
                // 也可以这样创建 StreamReader
                // File.OpenText(path);
                string str = string.Empty;
                while (true)
                {
                    str = sr.ReadLine();
                    if (!string.IsNullOrEmpty(str))
                    {
                        textBoxX1.Text += str + "
    ";
                    }
                    else
                    {
                        sr.Close();
                        fs.Close();
                        break;
                    }
                }
            }
            else
            {
                MessageBox.Show("指定的路径下不存在此文件!");
            }
        }
     
        /// <summary>
        /// 追加文件内容
        /// </summary>
        private void btnAppendFile_Click(object sender, EventArgs e)
        {
            string path = Application.StartupPath + "\Test.txt";
            FileStream fs = new FileStream(path, FileMode.Append);
            StreamWriter sw = new StreamWriter(fs);
            // 也可以这样创建 StreamReader
            // StreamWriter sw = File.AppendText(path);
            sw.WriteLine("This is three line.");
            sw.Close();
            fs.Close();
        }
     
        /// <summary>
        /// 复制文件
        /// </summary>
        private void btnCopyFile_Click(object sender, EventArgs e)
        {
            string oldPath = Application.StartupPath + "\Test.txt";
            string newPath = Application.StartupPath + "\TestClone.txt";
            File.Copy(oldPath, newPath);
        }
     
        /// <summary>
        /// 删除文件
        /// </summary>
        private void btnDeleteFile_Click(object sender, EventArgs e)
        {
            string path = Application.StartupPath + "\TestClone.txt";
            File.Delete(path);
        }
     
     
        /// <summary>
        /// 移动文件
        /// </summary>
        private void btnMoveFile_Click(object sender, EventArgs e)
        {
            string oldPath = Application.StartupPath + "\Test.txt";
            // 移动文件的同时也可以使用新的文件名
            string newPath = "d:\NewTest.txt";
            File.Move(oldPath, newPath);
        }
     
        /// <summary>
        /// 创建目录
        /// </summary>
        private void btnCreateDirectory_Click(object sender, EventArgs e)
        {
            string path1 = "d:\Jason1";
            // 创建目录 Jason1
            DirectoryInfo dDepth1 = Directory.CreateDirectory(path1);
            // dDepth2 指向 dDepth1 创建的子目录 Jason2
            DirectoryInfo dDepth2 = dDepth1.CreateSubdirectory("Jason2");
            // 设置应用程序当前的工作目录为 dDepth2 指向的目录
            Directory.SetCurrentDirectory(dDepth2.FullName);
            // 在当前目录创建目录 Jason3
            Directory.CreateDirectory("Jason3");
        }
     
        private void btnDeleteDirectory_Click(object sender, EventArgs e)
        {
            string path = "d:\Jason1";
            DeleteDirectory(path);
        }
     
        /// <summary>
        /// 删除目录及其所有子目录,文件
        /// </summary>
        private static void DeleteDirectory(string path)
        {
            if (Directory.Exists(path))
            {
                foreach (string str in Directory.GetFileSystemEntries(path))
                {
                    if (File.Exists(str))
                    {
                        File.Delete(str);
                    }
                    else
                    {
                        DeleteDirectory(str);
                    }
                }
                Directory.Delete(path);
            }
            else
            {
                MessageBox.Show("该目录不存在!");
            }
        }
     
        private void btnCopyDirectory_Click(object sender, EventArgs e)
        {
            string sourcePath = "d:\Jason1";
            string targetPath = "d:\Jason2";
            CopyDirectory(sourcePath, targetPath);
        }
     
        /// <summary>
        /// 复制目录及其所有内容
        /// </summary>
        /// <param name="sourcePath">源目录</param>
        /// <param name="targetPath">目标目录</param>
        private void CopyDirectory(string sourcePath, string targetPath)
        {
            // 该字符用于在反映分层文件系统组织的路径字符串中分隔目录级别(msdn)
            // 在windows系统下实质上是为目录路径加上"\"
            if (targetPath[targetPath.Length - 1] != Path.DirectorySeparatorChar)
            {
                targetPath += Path.DirectorySeparatorChar;
            }
            // 目标目录不存在则创建之
            if (!Directory.Exists(targetPath))
            {
                Directory.CreateDirectory(targetPath);
            }
            // 获取文件系统(含目录和文件)
            string[] fileList = Directory.GetFileSystemEntries(sourcePath);
            foreach (string fileName in fileList)
            {
                if (Directory.Exists(fileName))
                {
                    // Path.GetFileName(fileName) 可取出最后一个分级目录名或文件名
                    CopyDirectory(fileName, targetPath + Path.GetFileName(fileName));
                }
                else
                {
                    // true 为可覆盖
                    File.Copy(fileName, targetPath + Path.GetFileName(fileName), true);
                }
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/zxtceq/p/5667311.html
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