ASPを共有します.NETファイル圧縮解凍クラスC#

ICSharpCodeを参照する必要があります.SharpZipLib.dll 
 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ICSharpCode.SharpZipLib.Zip;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using System.Web;
namespace Mvc51Hiring.Common.Tool
{
    /// <summary>  
    ///   ：    
    ///    :sunkaixaun
    ///          
    /// </summary>  
    public class ZipClass
    {
        /// <summary>  
        ///         
        /// </summary>  
        List<string> files = new List<string>();

        /// <summary>  
        ///          
        /// </summary>  
        List<string> paths = new List<string>();

        /// <summary>  
        ///             
        /// </summary>  
        /// <param name="fileToZip">      </param>  
        /// <param name="zipedFile">        </param>  
        /// <param name="compressionLevel">    ，  0-9，    ，      </param>  
        /// <param name="blockSize">    </param>  
        public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)
        {
            if (!System.IO.File.Exists(fileToZip))//        ，     
            {
                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>  
        ///     （          ）  
        /// </summary>  
        /// <param name="rootPath">       </param>  
        /// <param name="destinationPath">    </param>  
        /// <param name="compressLevel">    ，  0-9，    ，      </param>  
        public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel)
        {
            GetAllDirectories(rootPath);

            /* while (rootPath.LastIndexOf("\\") + 1 == rootPath.Length)//       "\"   
            { 
 
            rootPath = rootPath.Substring(0, rootPath.Length - 1);//         "\" 
 
            } 
            */
            //string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\\") + 1);//         ，                  。  
            string rootMark = rootPath + "\\";//         ，                  。  
            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);//        
                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;
                // set Size and the crc, because the information  
                // about the size and crc should be stored in the header  
                // if it is not set it is automatically written in the footer.  
                // (in this case size == crc == -1 in the header)  
                // Some ZIP programs have problems with zip files that don't store  
                // the size and crc in the header.  
                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>  
        ///        
        /// </summary>  
        public void DwonloadZip(string[] filePathList, string zipName)
        {

            MemoryStream ms = new MemoryStream();
            byte[] buffer = null;
            var context = HttpContext.Current;
            using (ICSharpCode.SharpZipLib.Zip.ZipFile file = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(ms))
            {
                file.BeginUpdate();
                file.NameTransform = new MyNameTransfom();//          ，               。     ，           zip         。
                foreach (var it in filePathList)
                {
                    file.Add(context.Server.MapPath(it));
                }
                file.CommitUpdate();

                buffer = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(buffer, 0, buffer.Length);
            }
            context.Response.AddHeader("content-disposition", "attachment;filename=" + zipName);
            context.Response.BinaryWrite(buffer);
            context.Response.Flush();
            context.Response.End();
        }

        /// <summary>  
        ///              ，    files paths  
        /// </summary>  
        /// <param name="rootPath">   </param>  
        private void GetAllDirectories(string rootPath)
        {
            string[] subPaths = Directory.GetDirectories(rootPath);//         
            foreach (string path in subPaths)
            {
                GetAllDirectories(path);//                 ：                  List  
            }
            string[] files = Directory.GetFiles(rootPath);
            foreach (string file in files)
            {
                this.files.Add(file);//                 List  
            }
            if (subPaths.Length == files.Length && files.Length == 0)//        
            {
                this.paths.Add(rootPath);//       
            }
        }

        /// <summary>  
        ///      (          )  
        /// </summary>  
        /// <param name="zipfilepath">         </param>  
        /// <param name="unzippath">        </param>  
        /// <returns>        </returns>  
        public List<string> UnZip(string zipfilepath, string unzippath)
        {
            //           
            List<string> unzipFiles = new List<string>();

            //         “\\”    
            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);

                //      【           ，     】  
                if (!string.IsNullOrEmpty(directoryName))
                {
                    Directory.CreateDirectory(directoryName);
                }

                if (fileName != String.Empty)
                {
                    //           0           ,             
                    if (theEntry.CompressedSize == 0)
                        break;
                    //            
                    directoryName = Path.GetDirectoryName(unzippath + theEntry.Name);
                    //             
                    Directory.CreateDirectory(directoryName);

                    //         
                    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 class MyNameTransfom : ICSharpCode.SharpZipLib.Core.INameTransform
    {

        #region INameTransform   

        public string TransformDirectory(string name)
        {
            return null;
        }

        public string TransformFile(string name)
        {
            return Path.GetFileName(name);
        }

        #endregion
    }
}