C#-文件操作的一些常用函数及压缩文件

1.判断目录或文件是否存在(using System.IO;)：

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1 2	Directory.Exists(path)；//目录是否存在 File.Exists(filePath);/文件是否存在

2.创建或删除-目录或文件：

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Directory.CreateDirectory(path);//创建目录 Directory.Delete(path);//删除目录 File.Create(path);//创建文件 File.Delete(path);//删除文件 StreamWriter sw = new StreamWriter(path, true);//true表示追加，false表示覆盖，文件不存在则创建

3.获取目录下所有子目录 或 截取文件路径：

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string[] dirs = Directory.GetDirectories(dirPath); string str = Path.GetDirectoryName(filePath); //获取文件路径中的目录路径部分 string str = Path.GetFileName(filePath);//获取文件路径中的文件名称 string str = Path.GetFileNameWithoutExtension(filePath);//获取文件路径中文件名称(不包括后缀名)

4.获取目录下所有文件或指定后缀文件：

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1 2	string[] files = Directory.GetFiles(path); string[] files = Directory.GetFiles(path,"*.txt");

5.使用遍历获取目录下所有文件：

 1         void GetAllFiles(string root)
 2         {
 3             string[] dirs = Directory.GetDirectories(root);
 4             string[] files = Directory.GetFiles(root);
 5             foreach (string f in files)
 6             {
 7                 FileInfo file = new FileInfo(f);
 8                 Console.WriteLine(f + " " + file.CreationTime + " " + file.Length + "B");
 9             }
10             foreach (string d in dirs)
11                 GetAllFiles(d);
12         }

6.使用遍历由内而外删除目录下所有文件及目录：

 1         void DeleteAllFiles(string root)
 2         {
 3             DirectoryInfo folder = new DirectoryInfo(root);
 4             FileInfo[] files = folder.GetFiles();
 5             DirectoryInfo[] childFolders = folder.GetDirectories();
 6             foreach (DirectoryInfo chldFolder in childFolders)
 7                 DeleteAllFiles(chldFolder.FullName);
 8             foreach (DirectoryInfo chldFolder in childFolders)
 9             {
10                 chldFolder.Delete();
11                 Console.WriteLine("Delete Folder:" + chldFolder.FullName);
12             }
13             foreach (FileInfo f in files)
14             {
15                 f.Delete();
16                 Console.WriteLine("Delete Files:" + f.FullName);
17             }
18         }

7.将数据写入到文件，若不存在则创建文件：

 1             using (FileStream fs = new FileStream(path + file, FileMode.Append, FileAccess.Write))
 2             {
 3                 using (StreamWriter sw = new StreamWriter(fs))
 4                 {
 5                     sw.WriteLine("123");
 6                     sw.Flush();
 7                     sw.Close();
 8                     File.Copy(path + file, path + copy, true);
 9                 }
10                 fs.Close();
11             }

8.读取文件数据：

 1         using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
 2          {
 3                using (StreamReader sr = new StreamReader(fs))
 4                {
 5                      while (true)
 6                       {
 7                            string line = sr.ReadLine();
 8                             if (line == null)
 9                                 break;
10                             Console.WriteLine(f + ":" + line);
11                        }
12                        sr.Close();
13                 }
14                 fs.Close();
15          }

若文件中存在汉字，添加下面参数：

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1 2	StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding("gb2312")); //StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding("utf-8"));

9.压缩目录文件夹(using System.IO.Compression)：

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1	ZipFile.CreateFromDirectory(oldPath, zipPath, CompressionLevel.Optimal, true);

10.解压压缩包：

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1	ZipFile.ExtractToDirectory(zipPath, "D:\\test");

11.向压缩包追加文件：

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using (FileStream fs = new FileStream(zipPath, FileMode.Open)) {     using (ZipArchive arch = new ZipArchive(fs, ZipArchiveMode.Update))           arch.CreateEntryFromFile(file, Path.GetFileName(file)); }