C#中如何创建文件夹，复制文件夹，删除文件夹的方法

转自：http://www.cnblogs.com/pegasus923/archive/2011/01/26/1944838.html

http://liuxiaoyong.iteye.com/blog/1164851

C#中对文件夹操作需要用到Directory Class。其中提供了创建、删除、移动、枚举等静态方法。该类不能被继承。

以下代码实现了创建文件夹。

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if (!Directory.Exists(sPath)) {      Directory.CreateDirectory(sPath); }

以下是MSDN上Directory Class的Sample code。

http://msdn.microsoft.com/en-us/library/system.io.directory.aspx

以下代码首先检查指定的文件夹是否存在，若存在则删除之，否则创建之。接下来移动文件夹，在其中创建文件并统计文件夹中文件数目。

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using System; using System.IO;   class Test {     public static void Main()     {         // Specify the directories you want to manipulate.         string path = @"c:\MyDir";         string target = @"c:\TestDir";           try         {             // Determine whether the directory exists.             if (!Directory.Exists(path))             {                 // Create the directory it does not exist.                 Directory.CreateDirectory(path);             }               if (Directory.Exists(target))             {                 // Delete the target to ensure it is not there.                 Directory.Delete(target, true);             }               // Move the directory.             Directory.Move(path, target);               // Create a file in the directory.             File.CreateText(target + @"\myfile.txt");               // Count the files in the target directory.             Console.WriteLine("The number of files in {0} is {1}",                 target, Directory.GetFiles(target).Length);         }         catch (Exception e)         {             Console.WriteLine("The process failed: {0}", e.ToString());         }         finally {}     } }

以下代码演示了如何计算文件夹大小。

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// The following example calculates the size of a directory // and its subdirectories, if any, and displays the total size // in bytes.   using System; using System.IO;   public class ShowDirSize {     public static long DirSize(DirectoryInfo d)     {            long Size = 0;            // Add file sizes.         FileInfo[] fis = d.GetFiles();         foreach (FileInfo fi in fis)         {                  Size += fi.Length;            }         // Add subdirectory sizes.         DirectoryInfo[] dis = d.GetDirectories();         foreach (DirectoryInfo di in dis)         {             Size += DirSize(di);           }         return(Size);      }     public static void Main(string[] args)     {         if (args.Length != 1)         {             Console.WriteLine("You must provide a directory argument at the command line.");            }         else         {              DirectoryInfo d = new DirectoryInfo(args[0]);             long dsize = DirSize(d);             Console.WriteLine("The size of {0} and its subdirectories is {1} bytes.", d, dsize);         }     } }

删除文件夹： 

/// <summary>
/// C# 删除文件夹
/// </summary>
/// <param name="dir">删除的文件夹，全路径格式</param>
        private void DeleteFolder(string dir)
        {
            // 循环文件夹里面的内容
            foreach (string f in Directory.GetFileSystemEntries(dir))
            {
                // 如果是文件存在
                if (File.Exists(f))
                {
                    FileInfo fi = new FileInfo(f);
                    if (fi.Attributes.ToString().IndexOf("Readonly") != 1)
                    {
                        fi.Attributes = FileAttributes.Normal;
                    }
                    // 直接删除其中的文件
                    File.Delete(f);
                }
                else
                {
                    // 如果是文件夹存在
                    // 递归删除子文件夹
                    DeleteFolder(f);
                }
            }
            // 删除已空文件夹
            Directory.Delete(dir);
        }

复制文件夹： 

/// <summary>
/// 复制文件夹
/// </summary>
/// <param name="sourceFolder">待复制的文件夹</param>
/// <param name="destFolder">复制到的文件夹</param>
        private void CopyFolder(string sourceFolder, string destFolder)
        {
            if (!Directory.Exists(destFolder))
            {
                Directory.CreateDirectory(destFolder);
            }
            string[] files = Directory.GetFiles(sourceFolder);
            foreach (string file in files)
            {
                string name = Path.GetFileName(file);

                string dest = Path.Combine(destFolder, name);

                File.Copy(file, dest);
            }
            string[] folders = Directory.GetDirectories(sourceFolder);
            foreach (string folder in folders)
            {
                string name = Path.GetFileName(folder);

                string dest = Path.Combine(destFolder, name);

                CopyFolder(folder, dest);
            }
        }