C#-文件操作的一些常用函数及压缩文件

标签：fs 函数 C# 压缩文件 file new Directory using string

1.判断目录或文件是否存在(using System.IO;)：

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

2.创建路径上所有目录及子目录：

Directory.CreateDirectory(path);

3.获取目录下所有子目录：

string[] dirs = Directory.GetDirectories(dirPath);

4.获取目录下所有文件或指定后缀文件：

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          }

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

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

10.解压压缩包：

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

11.向压缩包追加文件：

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

 

　　

　　

标签：fs,函数,C#,压缩文件,file,new,Directory,using,string
From： https://www.cnblogs.com/cfsl/p/17046822.html