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

         /// <summary>
         /// 压缩文件
         /// </summary>
         /// <param name="fileName">压缩文件路径</param>
         /// <param name="zipName">压缩的文件名称</param>
         /// <param name="error">返回的错误信息</param>
         /// <returns></returns>
         public bool FileToZip(string fileName, string zipName, out string error)
         {
             error = string.Empty;
             try
             {
                 ZipOutputStream s = new ZipOutputStream(File.Create(zipName));
                 s.SetLevel(); // 0 - store only to 9 - means best compression
                 zip(fileName, s);
                 s.Finish();
                 s.Close();
                 return true;
             }
             catch (Exception ex)
             {
                 error = ex.Message;
                 return false;
             }
         }

         private void zip(string fileName, ZipOutputStream s)
         {
             if (fileName[fileName.Length - ] != Path.DirectorySeparatorChar)
                 fileName += Path.DirectorySeparatorChar;
             Crc32 crc = new Crc32();
             string[] filenames = Directory.GetFileSystemEntries(fileName);
             foreach (string file in filenames)
             {
                 if (Directory.Exists(file))
                 {
                     zip(file, s);
                 }
                 else // 否则直接压缩文件
                 {
                     //打开压缩文件
                     FileStream fs = File.OpenRead(file);

                     byte[] buffer = new byte[fs.Length];
                     fs.Read(buffer, , buffer.Length);
                     string tempfile = Path.GetFileName(file);
                     ZipEntry entry = new ZipEntry(tempfile);

                     entry.DateTime = DateTime.Now;
                     entry.Size = fs.Length;
                     fs.Close();
                     crc.Reset();
                     crc.Update(buffer);
                     entry.Crc = crc.Value;
                     s.PutNextEntry(entry);

                     s.Write(buffer, , buffer.Length);
                 }
             }
         }

将zip解压为文件或文件夹，函数代码如下

         /// <summary>
         /// 解压文件
         /// </summary>
         /// <param name="zipName">解压文件路径</param>
         /// <param name="fileDirName">解压到文件夹的名称</param>
         /// <param name="error">返回的错误信息</param>
         /// <returns></returns>
         public bool ZipToFile(string zipName, string fileDirName, out string error)
         {
             try
             {
                 error = string.Empty;
                 //读取压缩文件(zip文件)，准备解压缩
                 ZipInputStream s = new ZipInputStream(File.Open(zipName.Trim(), FileMode.Open, FileAccess.Read));
                 ZipEntry theEntry;

                 string rootDir = " ";
                 while ((theEntry = s.GetNextEntry()) != null)
                 {
                     string path = fileDirName;
                     //获取该文件在zip中目录
                     rootDir = Path.GetDirectoryName(theEntry.Name);
                     //获取文件名称
                     string fileName = Path.GetFileName(theEntry.Name);
                     if (string.IsNullOrEmpty(fileName))
                         continue;
                     //判断是否为顶层文件，是，将文件直接放在fileDirName下，否，创建目录
                     if (string.IsNullOrEmpty(rootDir))
                     {
                         if (!Directory.Exists(path))
                             Directory.CreateDirectory(path);
                     }
                     else
                     {
                         path += "\\" + rootDir;
                         if (!Directory.Exists(path))
                             Directory.CreateDirectory(path);
                     }

                     //将文件流写入对应目录下的文件中
                     if (fileName != String.Empty)
                     {
                         FileStream streamWriter = File.Create(path + "\\" + fileName);

                         int size = ;
                         byte[] data = new byte[];
                         while (true)
                         {
                             if (theEntry.Size == )
                                 break;

                             size = s.Read(data, , data.Length);
                             if (size > )
                             {
                                 streamWriter.Write(data, , size);
                             }
                             else
                             {
                                 break;
                             }
                         }
                         streamWriter.Close();
                     }
                 }
                 s.Close();
                 return true;
             }
             catch (Exception ex)
             {
                 error = ex.Message;
                 return false;
             }
         }

调用示例

 string error;
             if (FileToZip(@"E:\文档", "文档.zip", out error))
                 MessageBox.Show("Succee");
             else
                 MessageBox.Show(error);

压缩示例

 string error;
             if (ZipToFile(@"E:\文档.zip", "文档", out error))
                 MessageBox.Show("Succee");
             else
                 MessageBox.Show(error);

解压示例