C# 压缩和解压文件（SharpZipLib）

先从网上下载ICSharpCode.SharpZipLib.dll类库

将文件或文件夹压缩为zip，函数如下

 1         /// <summary>

 2         /// 压缩文件

 3         /// </summary>

 4         /// <param name="fileName">压缩文件路径</param>

 5         /// <param name="zipName">压缩的文件名称</param>

 6         /// <param name="error">返回的错误信息</param>

 7         /// <returns></returns>

 8         public bool FileToZip(string fileName, string zipName, out string error)

 9         {

10             error = string.Empty;

11             try

12             {

13                 ZipOutputStream s = new ZipOutputStream(File.Create(zipName));

14                 s.SetLevel(6); // 0 - store only to 9 - means best compression

15                 zip(fileName, s);

16                 s.Finish();

17                 s.Close();

18                 return true;

19             }

20             catch (Exception ex)

21             {

22                 error = ex.Message;

23                 return false;

24             }

25         }

26 

27 

28         private void zip(string fileName, ZipOutputStream s)

29         {

30             if (fileName[fileName.Length - 1] != Path.DirectorySeparatorChar)

31                 fileName += Path.DirectorySeparatorChar;

32             Crc32 crc = new Crc32();

33             string[] filenames = Directory.GetFileSystemEntries(fileName);

34             foreach (string file in filenames)

35             {

36                 if (Directory.Exists(file))

37                 {

38                     zip(file, s);

39                 }

40                 else // 否则直接压缩文件

41                 {

42                     //打开压缩文件

43                     FileStream fs = File.OpenRead(file);

44 

45                     byte[] buffer = new byte[fs.Length];

46                     fs.Read(buffer, 0, buffer.Length);

47                     string tempfile = Path.GetFileName(file);

48                     ZipEntry entry = new ZipEntry(tempfile);

49 

50                     entry.DateTime = DateTime.Now;

51                     entry.Size = fs.Length;

52                     fs.Close();

53                     crc.Reset();

54                     crc.Update(buffer);

55                     entry.Crc = crc.Value;

56                     s.PutNextEntry(entry);

57 

58                     s.Write(buffer, 0, buffer.Length);

59                 }

60             }

61         }

 

将zip解压为文件或文件夹，函数代码如下

 1         /// <summary>

 2         /// 解压文件

 3         /// </summary>

 4         /// <param name="zipName">解压文件路径</param>

 5         /// <param name="fileDirName">解压到文件夹的名称</param>

 6         /// <param name="error">返回的错误信息</param>

 7         /// <returns></returns>

 8         public bool ZipToFile(string zipName, string fileDirName, out string error)

 9         {

10             try

11             {

12                 error = string.Empty;

13                 //读取压缩文件(zip文件)，准备解压缩

14                 ZipInputStream s = new ZipInputStream(File.Open(zipName.Trim(), FileMode.Open, FileAccess.Read));

15                 ZipEntry theEntry;

16 

17                 string rootDir = " ";

18                 while ((theEntry = s.GetNextEntry()) != null)

19                 {

20                     string path = fileDirName;

21                     //获取该文件在zip中目录

22                     rootDir = Path.GetDirectoryName(theEntry.Name);

23                     //获取文件名称

24                     string fileName = Path.GetFileName(theEntry.Name);

25                     if (string.IsNullOrEmpty(fileName))

26                         continue;

27                     //判断是否为顶层文件，是，将文件直接放在fileDirName下，否，创建目录

28                     if (string.IsNullOrEmpty(rootDir))

29                     {

30                         if (!Directory.Exists(path))

31                             Directory.CreateDirectory(path);

32                     }

33                     else

34                     {

35                         path += "\\" + rootDir;

36                         if (!Directory.Exists(path))

37                             Directory.CreateDirectory(path);

38                     }

39 

40                     //将文件流写入对应目录下的文件中

41                     if (fileName != String.Empty)

42                     {

43                         FileStream streamWriter = File.Create(path + "\\" + fileName);

44 

45                         int size = 2048;

46                         byte[] data = new byte[2048];

47                         while (true)

48                         {

49                             if (theEntry.Size == 0)

50                                 break;

51 

52                             size = s.Read(data, 0, data.Length);

53                             if (size > 0)

54                             {

55                                 streamWriter.Write(data, 0, size);

56                             }

57                             else

58                             {

59                                 break;

60                             }

61                         }

62                         streamWriter.Close();

63                     }

64                 }

65                 s.Close();

66                 return true;

67             }

68             catch (Exception ex)

69             {

70                 error = ex.Message;

71                 return false;

72             }

73         }

调用示例

1 string error;

2             if (FileToZip(@"E:\文档", "文档.zip", out error))

3                 MessageBox.Show("Succee");

4             else

5                 MessageBox.Show(error);

压缩示例

1 string error;

2             if (ZipToFile(@"E:\文档.zip", "文档", out error))

3                 MessageBox.Show("Succee");

4             else

5                 MessageBox.Show(error);

解压示例