.net WebClient.DownloadString 由于编码问题导致字符损坏，但浏览器没问题
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WebClient.DownloadString results in mangled characters due to encoding issues, but the browser is OK
提问by Domenic
The following code:
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"));
results in a variable textthat contains, among many other things, the string
结果是一个变量text，其中包含许多其他内容，字符串
"$?o$-Minkowski space, scalar field, and the issue of Lorentz invariance"
“$?o$-Minkowski 空间、标量场和洛伦兹不变性问题”
However, when I visit that URL in Firefox, I get
但是，当我在 Firefox 中访问该 URL 时，我得到
$κ$-Minkowski space, scalar field, and the issue of Lorentz invariance
$κ$-Minkowski 空间、标量场和洛伦兹不变性问题
which is actually correct. I also tried
这实际上是正确的。我也试过
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);
but this gave the same problem.
但这给了同样的问题。
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 WebClientis failing in some other way? What can I do to mitigate this?
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来解决这个问题，但不是WebClient？提要是否正确 UTF8 编码，但WebClient以其他方式失败？我能做些什么来缓解这种情况？
回答by LostInComputer
It's not lying. You should set the webclient's encoding first before calling DownloadString.
这不是说谎。您应该在调用 DownloadString 之前先设置 webclient 的编码。
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");
}
As for why your alternative isn't working, it's because the usage is incorrect. Its should be:
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：
System.Text.Encoding.UTF8.GetString()
