c# 文件压缩zip或将zip文件解压的方法

1.必须Dll：

ICSharpCode.SharpZipLib.dll。可从Nutget程序包中获取。

2.压缩文件

/// <summary>
/// 压缩文件成zip
/// </summary>
/// <param name="fileZip">压缩成zip文件的绝对路径</param>
/// <param name="fileName">被压缩指定文件的名字</param>
/// <param name="zipFilePath"></param>
/// <returns></returns>
public bool CreateZipFile(string fileZip,string fileName, string zipFilePath)
  {
   bool isZip = false;
   if (!Directory.Exists(zipFilePath))
   {
    Logger.Info($"Cannot find directory {zipFilePath}", false, "FileToZip");
    return isZip;
   }
   try
   {
    string[] filenames = Directory.GetFiles(zipFilePath);
    using (ZipOutputStream s = new ZipOutputStream(File.Create(fileZip)))
    {
     s.SetLevel(9); // 压缩级别 0-9
     //s.Password = "123"; //Zip压缩文件密码
     byte[] buffer = new byte[4096]; //缓冲区大小
     foreach (string file in filenames.ToList())
     {
      if (file== zipFilePath+fileName)//指定被压缩文件的绝对路径
      {
       ZipEntry entry = new ZipEntry(Path.GetFileName(file));
       entry.DateTime = DateTime.Now;
       s.PutNextEntry(entry);
       using (FileStream fs = File.OpenRead(file))
       {
        int sourceBytes;
        do
        {
         sourceBytes = fs.Read(buffer, 0, buffer.Length);
         s.Write(buffer, 0, sourceBytes);
        } while (sourceBytes > 0);
        fs.Close();
        fs.Dispose();
       }
       break;
      }
     }
     s.Finish();
     s.Close();
     isZip = true;
    }
   }
   catch (Exception ex)
   {
    Logger.Info($"Exception during processing {0}", false, "FileToZip");
   }
   return isZip;
  }

3.将zip文件解压

/// <summary>
/// 解压文件
/// </summary>
/// <param name="zipFilePath">压缩文件的绝对路径</param>
 public void UnZipFile(string zipFilePath)
  {
   if (!File.Exists(zipFilePath))
   {
    Logger.Info($"Cannot find file {zipFilePath}", false, "FileToZip");
    return;
   }
   using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath)))
   {
    ZipEntry theEntry;
    while ((theEntry = s.GetNextEntry()) != null)
    {
     string directoryName = Path.GetDirectoryName(theEntry.Name);
     string fileName = Path.GetFileName(theEntry.Name);
     // create directory
     if (directoryName?.Length > 0)
     {
      Directory.CreateDirectory(directoryName);
     }
     if (!string.IsNullOrEmpty(fileName))
     {
      using (FileStream streamWriter = File.Create(theEntry.Name))
      {
       int size = 2048;
       byte[] data = new byte[2048];
       while (true)
       {
        size = s.Read(data, 0, data.Length);
        if (size > 0)
        {
         streamWriter.Write(data, 0, size);
        }
        else
        {
         break;
        }
       }
      }
     }
    }
   }
  }

4.其它：其中的Logger是Log4的用法。

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