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，当我尝试用 C# 代码(与上面相同的 GET 方法)为桌面应用程序执行相同的下载时，下载的 zip 文件不是有效的存档文件.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.我环顾四周寻找例子.我发现了几个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:Downloads1.zip");
        oWriter.Write(sr.ReadToEnd());
        oWriter.Close();
    }
    res.Close();
}
catch (Exception ex)
{
}

推荐答案

这主要是因为您使用 StreamWriter : TextWriter 来处理二进制 Zip 文件.StreamWriter 需要文本并将应用编码.即使是简单的 ASCII 编码器也可能会尝试修复"它认为无效的行尾.

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.

您可以将所有代码替换为:

You can replace all your code with:

  using (var client = new WebClient())
  {
    client.DownloadFile("http://something",  @"D:Downloads1.zip");
  }

注意对于新代码，您应该查看 HttpClient 而不是 WebClient.
然后不要使用 using( ) { }

Note that for new code you should look at HttpClient instead of WebClient.
And then don't use using( ) { }

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