如何在C＃中下载zip文件？ [英] How do I download zip file in C#?

问题描述

我使用HTTP GET在浏览器中下载zip文件，例如 https://example.com/up/DBID/a/rRID/eFID/vVID （不是确切的网址）

I use HTTP GET that downloads a zip file in a browser, something like https://example.com/up/DBID/a/rRID/eFID/vVID (not the exact url)

现在，当我尝试对于桌面应用程序，在C＃代码（与上述相同的GET方法）中进行相同的下载，下载的zip文件不是有效的归档文件。当我在记事本中打开这个文件时，它是一些HTML页面。

Now, when I try to do the same download in C# code(same GET method as above) for a desktop application, the zip file downloaded is not a valid archive file. When I opened this file in notepad, it was some HTML page.

我想我没有正确设置一些标题。我环顾四周。我发现有几个wrt上传，但没有看到任何下载。

I think I'm not setting some header correctly. I looked around for examples. I'd found several wrt uploads, but did not see anything for downloads.

代码：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET";
request.ContentType = "application/zip";
try
{
    HttpWebResponse res = (HttpWebResponse)request.GetResponse();
    using (StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default))
    {
        StreamWriter oWriter = new StreamWriter(@"D:\Downloads\1.zip");
        oWriter.Write(sr.ReadToEnd());
        oWriter.Close();
    }
    res.Close();
}
catch (Exception ex)
{
}

推荐答案

主要是因为您使用 StreamWriter：TextWriter 来处理二进制的Zip文件。 StreamWriter期望文本并将应用编码。即使简单的ASCII编码器也可能会尝试修复它认为是无效的行结尾。

It's mainly because you use a StreamWriter : TextWriter to handle a binary Zip file. A StreamWriter expects text and will apply an Encoding. And even the simple ASCII Encoder might try to 'fix' what it thinks are invalid line-endings.

您可以用以下方式替换所有代码：

You can replace all your code with:

  using (var client = new WebClient())
  {
    client.DownloadFile("http://something",  @"D:\Downloads\1.zip");
  }

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