提取内存中的zip文件与C＃失败DotNetZip

Question

我想下载并提取C＃中的zip文件，特别是DotNetZip。

当我运行这段代码...

 HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(reportUrl); 
     HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse(); 
     Stream stream = response.GetResponseStream(); 
     MemoryStream ms = new MemoryStream(); 

     stream.CopyTo(ms); 
     ms.Seek(0, 0); 
     ZipInputStream zip = new ZipInputStream(ms); 
     zip.Seek(0, 0); 

     ZipEntry e = zip.GetNextEntry(); 
     string s = e.FileName; 

     MemoryStream ms2 = new MemoryStream(); 
     e.Extract(ms2); 

后的提取方法执行，我得到...

 $exception {"Object reference not set to an instance of an object."} System.Exception {System.NullReferenceException} 

有什么想法？谢谢！

Answer 1

这很难说，为什么你的代码不能正常工作。我会通过简化它，并确保我妥善处理所有可支配的资源，如流开始：

class Program 
{ 
    static void Main() 
    { 
     var url = "http://downloads.sourceforge.net/project/junit/junit/3.8.1/junit3.8.1.zip"; 
     using (var client = new WebClient()) 
     using (var zip = ZipFile.Read(client.DownloadData(url))) 
     { 
      foreach (var entry in zip) 
      { 
       entry.Extract("."); 
      }   
     } 
    } 
} 

确保您签的文档，使用DotNetZip库many useful examples。