public static class ZipFileHelper

    {

        #region 加压解压方法

        /// <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;

        }

        /// <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

    }