解压缩

需要下载引用ICSharpCode.SharpZipLib.dll这个文件

using ICSharpCode.SharpZipLib.Zip;
using System.IO;

///////////////////////////////////调用////////////////////////////////////
            string filePath = GetRootPath() + "UploadFiles\test\aaa.zip";
            string destFilePath = GetRootPath() + "UploadFiles\test\";

            UnZip(filePath, destFilePath, "");
//////////////////////////////////////////////////////////////////////////////

        #region 解压
        /// <summary>
        /// 解压
        /// </summary>
        /// <param name="fileToUpZip">压缩文件路径</param>
        /// <param name="zipedFolder">解压文件存放路径,为空时默认创建文件夹</param>
        /// <param name="password">密码</param>
        public void UnZip(string fileToUpZip, string zipedFolder, string password)
        {
            if (!File.Exists(fileToUpZip))
            {
                return;
            }

            if (!Directory.Exists(zipedFolder))
            {
                Directory.CreateDirectory(zipedFolder);
            }

            ZipInputStream s = null;
            ZipEntry theEntry;

            string fileName;
            FileStream streamWriter = null;
            try
            {
                s = new ZipInputStream(File.OpenRead(fileToUpZip));
                s.Password = password;
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    if (theEntry.Name != String.Empty)
                    {
                        fileName = Path.Combine(zipedFolder, theEntry.Name);
                        //判断文件路径是否是文件夹
                        if (fileName.EndsWith("/") || fileName.EndsWith("\"))
                        {
                            Directory.CreateDirectory(fileName);
                            continue;
                        }

                        streamWriter = File.Create(fileName);
                        int size;
                        byte[] data = new byte[2048];
                        while (true)
                        {
                            size = s.Read(data, 0, data.Length);
                            if (size > 0)
                            {
                                streamWriter.Write(data, 0, size);
                            }
                            else
                            {
                                break;
                            }
                        }
                    }
                }
            }
            finally
            {
                if (streamWriter != null)
                {
                    streamWriter.Close();
                }
                if (s != null)
                {
                    s.Close();
                }
                GC.Collect();
                GC.Collect(1);
            }
        }
        #endregion