C#压缩解压zip 文件

 /// <summary>
 /// Zip 压缩文件
 /// </summary>
 public class Zip
 {
     public Zip()
     {

     }
     #region 加压方法
     /// <summary>
     /// 功能：压缩文件（暂时只压缩文件夹下一级目录中的文件，文件夹及其子级被忽略）
     /// </summary>
     /// <param name="dirPath">被压缩的文件夹夹路径</param>
     /// <param name="zipFilePath">生成压缩文件的路径，为空则默认与被压缩文件夹同一级目录，名称为：文件夹名+.zip</param>
     /// <param name="err">出错信息</param>
     /// <returns>是否压缩成功</returns>
     public static bool ZipFile(string dirPath, string zipFilePath, out string err)
     {
         err = "";
         if (dirPath == string.Empty)
         {
             err = "要压缩的文件夹不能为空！";
             return false;
         }
         if (!Directory.Exists(dirPath))
         {
             err = "要压缩的文件夹不存在！";
             return false;
         }
         //压缩文件名为空时使用文件夹名＋.zip
         if (zipFilePath == string.Empty)
         {
             if (dirPath.EndsWith("//"))
             {
                 dirPath = dirPath.Substring(, dirPath.Length - );
             }
             zipFilePath = dirPath + ".zip";
         }

         try
         {
             string[] filenames = Directory.GetFiles(dirPath);
             using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))
             {
                 s.SetLevel();
                 byte[] buffer = new byte[];
                 foreach (string file in filenames)
                 {
                     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, , buffer.Length);
                             s.Write(buffer, , sourceBytes);
                         } while (sourceBytes > );
                     }
                 }
                 s.Finish();
                 s.Close();
             }
         }
         catch (Exception ex)
         {
             err = ex.Message;
             return false;
         }
         return true;
     }
     #endregion 

     #region 解压
     /// <summary>
     /// 功能：解压zip格式的文件。
     /// </summary>
     /// <param name="zipFilePath">压缩文件路径</param>
     /// <param name="unZipDir">解压文件存放路径,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹</param>
     /// <param name="err">出错信息</param>
     /// <returns>解压是否成功</returns>
     public static bool UnZipFile(string zipFilePath, string unZipDir, out string err)
     {
         err = "";
         if (zipFilePath == string.Empty)
         {
             err = "压缩文件不能为空！";
             return false;
         }
         if (!File.Exists(zipFilePath))
         {
             err = "压缩文件不存在！";
             return false;
         }
         //解压文件夹为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹
         if (unZipDir == string.Empty)
             unZipDir = zipFilePath.Replace(Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));
         if (!unZipDir.EndsWith("//"))
             unZipDir += "//";
         if (!Directory.Exists(unZipDir))
             Directory.CreateDirectory(unZipDir);

         try
         {
             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);
                     if (directoryName.Length > )
                     {
                         Directory.CreateDirectory(unZipDir + directoryName);
                     }
                     if (!directoryName.EndsWith("//"))
                         directoryName += "//";
                     if (fileName != String.Empty)
                     {
                         using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))
                         {

                             int size = ;
                             byte[] data = new byte[];
                             while (true)
                             {
                                 size = s.Read(data, , data.Length);
                                 if (size > )
                                 {
                                     streamWriter.Write(data, , size);
                                 }
                                 else
                                 {
                                     break;
                                 }
                             }
                         }
                     }
                 }//while
             }
         }
         catch (Exception ex)
         {
             err = ex.Message;
             return false;
         }
         return true;
     }//解压结束
     #endregion