c#中实现递归文件拷贝（代码）

最新推荐文章于 2020-12-14 17:12:20 发布

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本文介绍了一种在Windows环境下使用C#语言实现的高效文件系统操作方法，包括长路径转短路径、文件递归复制以及目标路径冲突处理等关键功能。通过调用Windows API函数`GetShortPathName`进行路径转换，并采用递归方式处理目录结构，确保了文件备份过程的稳定性和效率。此外，程序还提供了用户交互选项，允许用户在遇到目标路径已存在的情况时选择是否删除或覆盖目标文件夹，从而增强了灵活性和实用性。

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//**************************************************************************//
        /*
         //获得长路径的相对短路径名称
        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        public static extern uint GetShortPathName(string lpszLongPath, StringBuilder lpszShortPath, int cchBuffer);
        //实现文件拷贝，递归逐文件拷贝
        private void DirectoryCopy(string sourceDir, string targetDir)
        {
            

            if (!Directory.Exists(sourceDir))
            {
                DialogResult OKButtonDown = MessageBox.Show("需要备份的路径不存在，请查看！", "备份失败", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                if (DialogResult.OK == OKButtonDown)
                {
                    Application.Exit();
                }
            }
            
            string sourceFolderName = sourceDir.Replace(Directory.GetParent(sourceDir).ToString(), "").Replace(Path.DirectorySeparatorChar.ToString(), "");

            if (sourceDir == targetDir + sourceFolderName)
            {
                DialogResult OKButtonDown = MessageBox.Show("备份的目标路径和原路径相同，不需要备份！", "备份失败", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                if (DialogResult.OK == OKButtonDown)
                {
                    Application.Exit();
                }
 
            }

            //得到要复制到的路径
            string tagetPath = targetDir + Path.DirectorySeparatorChar.ToString() + sourceFolderName;


            //检查目标路径
            if (Directory.Exists(tagetPath))
            {
                DialogResult OKButtonDown = MessageBox.Show("备份的目标路径已经存在，点击是将删除目标并备份，点击否将覆盖并备份", "请查看", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);
                if (DialogResult.Yes == OKButtonDown)
                {
                    Directory.Delete(tagetPath, true);
                    //return;
                }
                else if (DialogResult.No == OKButtonDown)
                {
                    //复制文件
                    string[] files1 = Directory.GetFiles(sourceDir);
                    for (int i = 0; i < files1.Length; i++)
                    {

                        File.Copy(files1[i], tagetPath + Path.DirectorySeparatorChar.ToString() + Path.GetFileName(files1[i]), true);
                    }
                    //复制目录
                    string[] dires1 = Directory.GetDirectories(sourceDir);
                    for (int j = 0; j < dires1.Length; j++)
                    {
                        DirectoryCopy(dires1[j], tagetPath);
                    }
                    return;
                }
                else if (DialogResult.Cancel == OKButtonDown)
                {
                    Application.Exit();

                }

            }
           
            StringBuilder _shortPath1 = new StringBuilder(255);
            uint result1 = GetShortPathName(tagetPath, _shortPath1, 255);
            string MyShortPath1 = _shortPath1.ToString();
            if (0 == result1)
            {
                Directory.CreateDirectory(tagetPath);
            }
            else
            {
                Directory.CreateDirectory(MyShortPath1);
            }
            //复制文件
            string[] files3 = Directory.GetFiles(sourceDir);
            for (int i = 0; i < files3.Length; i++)
            {
                //string longPath = tagetPath + Path.DirectorySeparatorChar.ToString() + Path.GetFileName(files3[i]);
                //StringBuilder _shortPath = new StringBuilder(255);
                //uint result = GetShortPathName(longPath, _shortPath, 255);
                //string MyShortPath = _shortPath.ToString();
                File.Copy(files3[i],/*MyShortPath/tagetPath + Path.DirectorySeparatorChar.ToString() + Path.GetFileName(files3[i]), true);
            }
            //复制目录
            string[] dires3 = Directory.GetDirectories(sourceDir);
            for (int j = 0; j < dires3.Length; j++)
            {
                string longPath = dires3[j];
                StringBuilder _shortPath = new StringBuilder(255);
                uint result = GetShortPathName(longPath, _shortPath, 255);
                string MyShortPath = _shortPath.ToString();

                DirectoryCopy(MyShortPath, tagetPath);
            }
        }
*/

   /// <summary>
        /// 更新新版本文件
        /// </summary>
  /*      private void NewFileCover(string NewDir , string OlDir)
        {
            if (!Directory.Exists(NewDir))
            {
                DialogResult OKButtonDown = MessageBox.Show("需要备份的路径不存在，请查看！", "备份失败", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                if (DialogResult.OK == OKButtonDown)
                {
                    Application.Exit();
                }
            }
            //Directory.CreateDirectory(OlDir);

            //复制文件
            string[] files3 = Directory.GetFiles(NewDir);
            for (int i = 0; i < files3.Length; i++)
            {
                File.Copy(files3[i], OlDir + Path.DirectorySeparatorChar.ToString() + Path.GetFileName(files3[i]), true);
            }
            //复制目录
            string[] dires3 = Directory.GetDirectories(NewDir);
            for (int j = 0; j < dires3.Length; j++)
            {

                string longPath = dires3[j];
                StringBuilder _shortPath = new StringBuilder(255);
                uint result = GetShortPathName(longPath, _shortPath, 255);
                string MyShortPath = _shortPath.ToString();

               // DirectoryCopy(dires3[j], OlDir);
                NewFileCover(MyShortPath, OlDir);
            }
 
        }
        */