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(6); // 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 - 1] != 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, 0, 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, 0, 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 = 2048;
                        byte[] data = new byte[2048];
                        while (true)
                        {
                            if (theEntry.Size == 0)
                                break;

                            size = s.Read(data, 0, data.Length);
                            if (size > 0)
                            {
                                streamWriter.Write(data, 0, 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);

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