WebClient.DownloadString 由于编码问题导致字符损坏，但浏览器正常

发布于 2024-11-30 18:44:16 字数 812 浏览 1 评论 0原文

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"));

生成一个变量 text，其中包含字符串等

“$$-Minkowski 空间、标量场和洛伦兹不变性问题”

但是，当我在 Firefox 中访问该 URL 时，我得到

$κ$-闵可夫斯基空间、标量场和洛伦兹不变性问题

实际上是正确的。我也尝试过，

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);

但这给出了同样的问题。

我不确定这里的错在哪里。提要是否谎称是 UTF8 编码的，并且浏览器足够聪明，可以识别出这一点，但 WebClient 却不能？提要是否已正确进行 UTF8 编码，但 WebClient 因其他原因而失败？我可以采取什么措施来缓解这种情况？

原文

The following code:

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 text that contains, among many other things, the string

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

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

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

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);

but this gave the same problem.

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?

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爱的故事 2024-12-07 18:44:16

这不是说谎。在调用 DownloadString 之前，您应该先设置 Web 客户端的编码。

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");
}

至于为什么你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()

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");
}

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