C# 压缩文件

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   上一节讲述了C# WebApi传参之Post请求-AJAX

   本节探讨C#压缩文件的方法，直接上代码

   如下

 public class ZipUtility
    {
        /// <summary>  
        /// 所有文件缓存  
        /// </summary>  
        List<string> files = new List<string>();

        /// <summary>  
        /// 所有空目录缓存  
        /// </summary>  
        List<string> paths = new List<string>();

        /// <summary>  
        /// 压缩单个文件  
        /// </summary>  
        /// <param name="fileToZip">要压缩的文件</param>  
        /// <param name="zipedFile">压缩后的文件全名</param>  
        /// <param name="compressionLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>  
        /// <param name="blockSize">分块大小</param>  
        public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)
        {
            if (!System.IO.File.Exists(fileToZip))//如果文件没有找到，则报错  
            {
                throw new FileNotFoundException("The specified file " + fileToZip + " could not be found. Zipping aborderd");
            }

            FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read);
            FileStream zipFile = File.Create(zipedFile);
            ZipOutputStream zipStream = new ZipOutputStream(zipFile);
            ZipEntry zipEntry = new ZipEntry(fileToZip);
            zipStream.PutNextEntry(zipEntry);
            zipStream.SetLevel(compressionLevel);
            byte[] buffer = new byte[blockSize];
            int size = streamToZip.Read(buffer, 0, buffer.Length);
            zipStream.Write(buffer, 0, size);

            try
            {
                while (size < streamToZip.Length)
                {
                    int sizeRead = streamToZip.Read(buffer, 0, buffer.Length);
                    zipStream.Write(buffer, 0, sizeRead);
                    size += sizeRead;
                }
            }
            catch (Exception ex)
            {
                GC.Collect();
                throw ex;
            }

            zipStream.Finish();
            zipStream.Close();
            streamToZip.Close();
            GC.Collect();
        }

        /// <summary>  
        /// 压缩目录（包括子目录及所有文件）  
        /// </summary>  
        /// <param name="rootPath">要压缩的根目录</param>  
        /// <param name="destinationPath">保存路径</param>  
        /// <param name="compressLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>  
        public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel)
        {
            GetAllDirectories(rootPath);

            /* while (rootPath.LastIndexOf("\") + 1 == rootPath.Length)//检查路径是否以""结尾 
            { 
 
            rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是则去掉末尾的"" 
 
            } 
            */
            //string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\") + 1);//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。  
            string rootMark = rootPath + "\";//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。  
            Crc32 crc = new Crc32();
            ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath));
            outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression  
            foreach (string file in files)
            {
                FileStream fileStream = File.OpenRead(file);//打开压缩文件  
                byte[] buffer = new byte[fileStream.Length];
                fileStream.Read(buffer, 0, buffer.Length);
                ZipEntry entry = new ZipEntry(file.Replace(rootMark, string.Empty));
                entry.DateTime = DateTime.Now;
 
                entry.Size = fileStream.Length;
                fileStream.Close();
                crc.Reset();
                crc.Update(buffer);
                entry.Crc = crc.Value;
                outPutStream.PutNextEntry(entry);
                outPutStream.Write(buffer, 0, buffer.Length);
            }

            this.files.Clear();

            foreach (string emptyPath in paths)
            {
                ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");
                outPutStream.PutNextEntry(entry);
            }

            this.paths.Clear();
            outPutStream.Finish();
            outPutStream.Close();
            GC.Collect();
        }

        /// <summary>  
        /// 取得目录下所有文件及文件夹，分别存入files及paths  
        /// </summary>  
        /// <param name="rootPath">根目录</param>  
        private void GetAllDirectories(string rootPath)
        {
            string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目录  
            foreach (string path in subPaths)
            {
                GetAllDirectories(path);//对每一个字目录做与根目录相同的操作：即找到子目录并将当前目录的文件名存入List  
            }
            string[] files = Directory.GetFiles(rootPath);
            foreach (string file in files)
            {
                this.files.Add(file);//将当前目录中的所有文件全名存入文件List  
            }
            if (subPaths.Length == files.Length && files.Length == 0)//如果是空目录  
            {
                this.paths.Add(rootPath);//记录空目录  
            }
        }

        /// <summary>  
        /// 解压缩文件(压缩文件中含有子目录)  
        /// </summary>  
        /// <param name="zipfilepath">待解压缩的文件路径</param>  
        /// <param name="unzippath">解压缩到指定目录</param>  
        /// <returns>解压后的文件列表</returns>  
        public List<string> UnZip(string zipfilepath, string unzippath)
        {
            //解压出来的文件列表  
            List<string> unzipFiles = new List<string>();

            //检查输出目录是否以“\”结尾  
            if (unzippath.EndsWith("\") == false || unzippath.EndsWith(":\") == false)
            {
                unzippath += "\";
            }

            ZipInputStream s = new ZipInputStream(File.OpenRead(zipfilepath));
            ZipEntry theEntry;
            while ((theEntry = s.GetNextEntry()) != null)
            {
                string directoryName = Path.GetDirectoryName(unzippath);
                string fileName = Path.GetFileName(theEntry.Name);

                //生成解压目录【用户解压到硬盘根目录时，不需要创建】  
                if (!string.IsNullOrEmpty(directoryName))
                {
                    Directory.CreateDirectory(directoryName);
                }

                if (fileName != String.Empty)
                {
                    //如果文件的压缩后大小为0那么说明这个文件是空的,因此不需要进行读出写入  
                    if (theEntry.CompressedSize == 0)
                        continue;
                    //解压文件到指定的目录  
                    directoryName = Path.GetDirectoryName(unzippath + theEntry.Name);
                    //建立下面的目录和子目录  
                    Directory.CreateDirectory(directoryName);

                    //记录导出的文件  
                    unzipFiles.Add(unzippath + theEntry.Name);

                    FileStream streamWriter = File.Create(unzippath + 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;
                        }
                    }
                    streamWriter.Close();
                }
            }
            s.Close();
            GC.Collect();
            return unzipFiles;
        }

        public string GetZipFileExtention(string fileFullName)
        {
            int index = fileFullName.LastIndexOf(".");
            if (index <= 0)
            {
                throw new Exception("The source package file is not a compress file");
            }

            //extension string
            string ext = fileFullName.Substring(index);

            if (ext == ".rar" || ext == ".zip")
            {
                return ext;
            }
            else
            {
                throw new Exception("The source package file is not a compress file");
            }
        }
    }

   上述代码便是压缩文件的方法，我的测试结果如下：

   

   这是项目源文件，我要把：高效程序员的45个习惯压缩.pdf 文件进行压缩，由图可知，确实压缩成了：高效程序员的45个习惯压缩.zip 但是当你尝试去解压这个.zip文件后，你会发现解压后得到的文件夹中包含N+1层文件夹，最后的一层文件夹中能够找到我压缩的pdf文件，这点匪夷所思，有兴趣的小虎斑可以把你们的见解贴在下面的评论上，供大家参考，同时也为LZ提供个思路，谢谢！

   我示例的代码如下：

  public ActionResult Index()
        {
            C2Global.Architect.Common.ZipUtility zip = new C2Global.Architect.Common.ZipUtility();
            zip.ZipFile(Server.MapPath("~/file/高效程序员的45个习惯.pdf"), Server.MapPath("~/file/高效程序员的45个习惯.zip"), 5, 10);
            return View();
        }

   程序声明：本段程序需要引用一个dll文件，这个dll文件的全名叫做：ICSharpCode.SharpZipLib.dll 小虎斑们可自行下载

   

   大家也可尝试用这个链接进行下载：http://files.cnblogs.com/files/chenwolong/ICSharpCode.SharpZipLib.zip  这是我上传至博客园的，应该可以下载，支持Net4.5框架

   关于：解压后得到的文件夹中包含N+1层文件夹的问题，欢迎大家指正，讨论，谢谢！

2019年7月17日新增加一个方法如下：

2019年7月17日19.56分   

场景：压缩同一文件夹下的某几个文件：

        /// <summary>
        /// 压缩目录下的多个文件
        /// </summary>
        /// <param name="rootPath"></param>
        /// <param name="rootPath"></param>
        /// <param name="destinationPath"></param>
        /// <param name="compressLevel"></param>
        public void ZipDirectoryFiles(string rootMark, List<SharpZipLibFileModel> Files, string destinationPath, int compressLevel)
        {
            Crc32 crc = new Crc32();
            ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath));
            outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression  
            foreach (var file in Files)
            {
                FileStream fileStream = File.OpenRead(file.SharpZipLibFilePath);//打开压缩文件  
                byte[] buffer = new byte[fileStream.Length];
                fileStream.Read(buffer, 0, buffer.Length);
                //构造函数中的文件名为新的文件名
                ZipEntry entry = new ZipEntry(file.SharpZipLibFileName);
                entry.DateTime = DateTime.Now;

                entry.Size = fileStream.Length;
                fileStream.Close();
                crc.Reset();
                crc.Update(buffer);
                entry.Crc = crc.Value;
                outPutStream.PutNextEntry(entry);
                outPutStream.Write(buffer, 0, buffer.Length);
            }

            this.files.Clear();

            foreach (string emptyPath in paths)
            {
                ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");
                outPutStream.PutNextEntry(entry);
            }

            this.paths.Clear();
            outPutStream.Finish();
            outPutStream.Close();
            GC.Collect();
        }

//调用如下：

 /// <summary>
        /// 全部下载招标文件附件
        /// </summary>
        /// <param name="flowId"></param>
        /// <param name="compressFilePath">打包压缩后的文件路径 用于下载完成后删除</param>
        public static void downLoadTenderDocs(string flowId,string RootSource,out string
compressfilePath,out string destinationfileName)
        {
            string sql = @"select *from CF_Document 
                                where Refrecordid in
                                (select CAST(Tenderdocumentid as varchar(50)) 
                                from TMS_Tenderdocument 
                                where Tenderflowid='" + flowId + "' and ISNULL  (MT_Coreinfo,'')!='')";
            var ds = DataAccessCommon.SelectDataSet(sql);
            var lst = JsonHelper.DataSetToIList<DocumentModel>(ds, 0);
            List<SharpZipLibFileModel> Files = new List<SharpZipLibFileModel>();
            foreach (var item in lst)
            {
                string FilePath = RootSource + item.Url;
                if (File.Exists(FilePath))
                {
                    SharpZipLibFileModel M = new SharpZipLibFileModel();
                    M.SharpZipLibFilePath = FilePath;
                    M.SharpZipLibFileName = item.Documentname;
                    Files.Add(M);

                }
            }
            destinationfileName = DateTime.Now.ToString("yyyyMMddhhmmssfff").ToString() + "招标文件.zip";
            compressfilePath = RootSource + "/Uploads/" + destinationfileName;
            string path = RootSource + "/Uploads/";
            SharpZipLib zipLib = new SharpZipLib();
            zipLib.ZipDirectoryFiles(path, Files, compressfilePath, 9);

        }

//调用如下：

        /// <summary>
        /// 下载所有招标哦文件
        /// </summary>
        /// <param name="flowId"></param>
        /// <param name="DownloadCate"></param>
        /// <returns></returns>
        public ActionResult DownloadTenderDocs(string flowId)
        {
            ViewBag.Title = "附件下载";
            string _compressfilePath;
            string _destinationfileName;
            string path = Server.MapPath("/");
            //完成打包压缩
            TenderDiscussingService.downLoadTenderDocs(flowId,path,out _compressfilePath,out _destinationfileName);
            if (System.IO.File.Exists(_compressfilePath))
            {
                return new downLoadFileResult(_compressfilePath, _destinationfileName);
            }
            else
            {
                ViewBag.Title = "未找到相关附件";
                ViewBag.files = "None";
                return View();
            }
        }

关于下载方法，请阅读大附件上传：webuploader-异步切片上传（支持断点续传）及 下载方法！C#/.NET

一个小的Model如下：

    public class SharpZipLibFileModel
    {
        public string SharpZipLibFilePath { get; set; }
        public string SharpZipLibFileName { get; set; }
    }

2019年7月17日20.33分

如果需要将某几个文件移动到另外一个文件夹，需要用到 File.Copy(SourcePth, DestPth, true);方法，如下：

        public static void GetDocuments(string path,out string DirectoryPath,out string DestinationPath)
        {
            using (ShiMaoZhaoCaiEntities context = new ShiMaoZhaoCaiEntities())
            {
                string sql = @"select *from CF_Document 
                                where Refrecordid in
                                (select CAST(Tenderdocumentid as varchar(50)) 
                                from TMS_Tenderdocument 
                                where Tenderflowid='AC273672-ED2C-4F5D-9731-45C96EE39238' and ISNULL  (MT_Coreinfo,'')!='')";
                var lst = context.Database.SqlQuery<CF_Document>(sql).ToList();
                string NewFilePaht = path+ "Uploads/";
                CombineFile.CombineFiles(ref NewFilePaht);
                DirectoryPath = NewFilePaht;

                foreach (var item in lst)
                {
                    if (File.Exists(path + item.Url))
                    {
                        string SourcePth = path + item.Url;
                        string DestPth = NewFilePaht + "/" + item.Documentname;
                        File.Copy(SourcePth, DestPth, true);
                    }
                }
                string destinationPath = NewFilePaht + "/" + Guid.NewGuid().ToString()+".zip" ;
                DestinationPath = destinationPath;
                SharpZipLib zipLib = new SharpZipLib();
                zipLib.ZipFileFromDirectory(NewFilePaht, destinationPath, 9);

            }
        }

调用如下：

 public ActionResult Index()
        {
            string path=Server.MapPath("/");
            string DirectoryPath;
            string DestinationPath;
            DocumentService.GetDocuments(path,out DirectoryPath,out DestinationPath);
}

辅助方法：

    public class CombineFile
    {
        public static void CombineFiles(ref string filePath)
        {
            string ChildFilePath = Guid.NewGuid().ToString() ;
            filePath = filePath+ ChildFilePath;
            if (!Directory.Exists(filePath))
            {
                Directory.CreateDirectory(filePath);
            }
        }
    }

数据库截图如下：

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