WebClient.DownloadString 由于编码问题导致字符损坏，但浏览器没问题 [英] WebClient.DownloadString results in mangled characters due to encoding issues, but the browser is OK

问题描述

以下代码:

var text = (new WebClient()).DownloadString("http://export.arxiv.org/api/query?search_query=au:Freidel_L*&start=0&max_results=20"));

产生一个变量 text，其中包含字符串

results in a variable text that contains, among many other things, the string

$κ$-Minkowski 空间、标量场和洛伦兹不变性问题"

"$κ$-Minkowski space, scalar field, and the issue of Lorentz invariance"

但是，当我在 Firefox 中访问该 URL 时，我得到

However, when I visit that URL in Firefox, I get

$κ$-Minkowski 空间、标量场和洛伦兹不变性问题

$κ$-Minkowski space, scalar field, and the issue of Lorentz invariance

这实际上是正确的.我也试过

which is actually correct. I also tried

var data = (new WebClient()).DownloadData("http://export.arxiv.org/api/query?search_query=au:Freidel_L*&start=0&max_results=20");
var text = System.Text.UTF8Encoding.Default.GetString(data);

但这也带来了同样的问题.

but this gave the same problem.

我不确定这里的错误在哪里.提要是否在说谎是 UTF8 编码，浏览器是否足够聪明，可以弄清楚这一点，但不是 WebClient?提要是否正确 UTF8 编码，但 WebClient 以其他方式失败?我可以做些什么来缓解这种情况?

I'm not sure where the fault lies here. Is the feed lying about being UTF8-encoded, and the browser is smart enough to figure that out, but not WebClient? Is the feed properly UTF8-encoded, but WebClient is failing in some other way? What can I do to mitigate this?

推荐答案

这不是说谎.您应该在调用 DownloadString 之前先设置 webclient 的编码.

It's not lying. You should set the webclient's encoding first before calling DownloadString.

using(WebClient webClient = new WebClient())
{
webClient.Encoding = Encoding.UTF8;
string s = webClient.DownloadString("http://export.arxiv.org/api/query?search_query=au:Freidel_L*&start=0&max_results=20");
}

至于为什么您的替代方案不起作用，那是因为用法不正确.它应该是:

As for why your alternative isn't working, it's because the usage is incorrect. Its should be:

System.Text.Encoding.UTF8.GetString()

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