使用C＃DotNetZip解压缩内存中的zip文件

Question

我正在尝试下载并提取C＃中的zip文件，特别是DotNetZip。

当我运行此代码时......

        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);

执行Extract方法后，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

很难说为什么你的代码不起作用。我首先要简化它并确保我正确处理所有可支配的资源，例如流：

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(".");
            }        
        }
    }
}

请务必查看使用DotNetZip库的many useful examples文档。