C# ICSharpCode.SharpZipLib.dll文件压缩和解压功能类整理，上传文件或下载文件很常用

工作中我们很多时候需要进行对文件进行压缩，比较通用的压缩的dll就是ICSharpCode.SharpZipLib.dll，废话不多了，网上也有很多的资料，我将其最常用的两个函数整理了一下，提供了一个通用的类，这样在工作中可以快速的完成压缩和解压缩的动作哦

官网下载地址：  http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx

1. 在项目中添加对ICSharpCode.SharpZipLib.dll的引用；

2. 在需要使用到ICSharpCode.SharpZipLib中定义的类的编码界面中将其导入(Imports)

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

 namespace ZTO.WayBill.Utilities
 {
     /// <summary>
     /// 压缩类
     /// http://www.cnblogs.com/kissdodog/p/3525295.html 

     /// </summary>
     public class ZipHelper
     {
         /// <summary>
         /// 压缩文件夹
         /// </summary>
         /// <param name="source">源目录</param>
         /// <param name="s">ZipOutputStream对象</param>
         public static void Compress(string source, ZipOutputStream s)
         {
             string[] filenames = Directory.GetFileSystemEntries(source);
             foreach (string file in filenames)
             {
                 if (Directory.Exists(file))
                 {
                     // 递归压缩子文件夹
                     Compress(file, s);
                 }
                 else
                 {
                     using (FileStream fs = File.OpenRead(file))
                     {
                         byte[] buffer = new byte[ * ];
                         // 此处去掉盘符，如D:\123\1.txt 去掉D:
                         ZipEntry entry = new ZipEntry(file.Replace(Path.GetPathRoot(file), ""));
                         entry.DateTime = DateTime.Now;
                         s.PutNextEntry(entry);
                         int sourceBytes;
                         do
                         {
                             sourceBytes = fs.Read(buffer, , buffer.Length);
                             s.Write(buffer, , sourceBytes);
                         } while (sourceBytes > );
                     }
                 }
             }
         }

         /// <summary>
         /// 解压缩
         /// </summary>
         /// <param name="sourceFile">压缩包完整路径地址</param>
         /// <param name="targetPath">解压路径是哪里</param>
         /// <returns></returns>
         public static bool Decompress(string sourceFile, string targetPath)
         {
             if (!File.Exists(sourceFile))
             {
                 throw new FileNotFoundException(string.Format("未能找到文件 '{0}' ", sourceFile));
             }
             if (!Directory.Exists(targetPath))
             {
                 Directory.CreateDirectory(targetPath);
             }
             using (var s = new ZipInputStream(File.OpenRead(sourceFile)))
             {
                 ZipEntry theEntry;
                 while ((theEntry = s.GetNextEntry()) != null)
                 {
                     if (theEntry.IsDirectory)
                     {
                         continue;
                     }
                     string directorName = Path.Combine(targetPath, Path.GetDirectoryName(theEntry.Name));
                     string fileName = Path.Combine(directorName, Path.GetFileName(theEntry.Name));
                     if (!Directory.Exists(directorName))
                     {
                         Directory.CreateDirectory(directorName);
                     }
                     if (!String.IsNullOrEmpty(fileName))
                     {
                         using (FileStream streamWriter = File.Create(fileName))
                         {
                             int size = ;
                             byte[] data = new byte[size];
                             while (size > )
                             {
                                 streamWriter.Write(data, , size);
                                 size = s.Read(data, , data.Length);
                             }
                         }
                     }
                 }
             }
             return true;
         }
     }
 }