c# - 来自http响应内容c#的具体值

Question

我想知道如何从 http 响应内容中提取特定值。假设我发出 getAsync 请求的页面返回响应，在该响应中我需要提取密码的值。如何在此 getAsync 方法中获取网站密码的值？

这是我的代码：

  async static void DownloadPage(string url)
    {
        CookieContainer cookies = new CookieContainer();
        HttpClientHandler handler = new HttpClientHandler();
        handler.CookieContainer = cookies;

        using (HttpClient client = new HttpClient(handler))
        {
            using (HttpResponseMessage response = client.GetAsync("https://www.kijiji.ca/t-login.html").Result)
            {

                HttpHeaders headers = response.Headers;
                HttpContent content = response.Content;
                string myContent = await content.ReadAsStringAsync();



            }

        }

这是我得到的回复：

    <!DOCTYPE html>
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    <title>Kijiji Canada | Free local classifieds</title>
    <link rel="SHORTCUT ICON" href="//ca.classistatic.com/static/V/2918.2/img/kijijiFavicon.ico" type="image/vnd.microsoft.icon"/>
    <link rel="publisher" href="https://plus.google.com/+KijijiCanada" />
    <meta property="og:site_name" content="Kijiji"/>
    <meta property="og:country-name" content="Canada"/>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>

<meta name="msvalidate.01" content="E03E7C8B4B4E1A0234A8D2042FD326E8" />

<meta name='yandex-verification' content='79bdb66f55dcb3ee' />

    <meta name="google" content="nositelinkssearchbox">

    <meta http-equiv="content-language" content="en">

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                                <input id="targetUrl" name="targetUrl" type="hidden" value="L15udS9JWHhHMURBNmdjdkFuTFJJeUR3PT0-"/><section>
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                                        Email Address or Nickname:</label>
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                                </section>

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</html>

score 0 · Accepted Answer

更新：

如果要检索特定元素的值，则需要解析检索到的页面内容。有很多包可以为您解析 HTML，因此您不必手动执行，例如 HTML Agility：http ://www.nuget.org/packages/HtmlAgilityPack

如果您想手动执行此操作，希望这可以帮助您入门：

static void DownloadPage()
{
    CookieContainer cookies = new CookieContainer();
    HttpClientHandler handler = new HttpClientHandler();
    handler.CookieContainer = cookies;

    using (HttpClient client = new HttpClient(handler))
    {
        using (HttpResponseMessage response = client.GetAsync("https://www.kijiji.ca/t-login.html").Result)
        {
            HttpHeaders headers = response.Headers;
            HttpContent content = response.Content;
            string myContent = content.ReadAsStringAsync().Result;

            // Find value of ASOtherLang.
            //  It's in this pattern:
            //  <input type="hidden" id="ASOtherLang" value="fr_CA"/>
            Regex regex = new Regex("id=\"ASOtherLang\" value=\"(.*)\"");
            var otherLang = regex.Match(myContent).Groups[1];
            Console.WriteLine(otherLang);
        }
    }
}

听起来您要求通过向网站发送 GET 请求来检索密码输入的值。这无法完成（除非该输入中有默认值）。

您从 GET 请求中得到的输入是：

<input id="login-password" name="password" req="req" type="password" value="" maxlength="64"/>

您对此无能为力，无法为您提供登录密码。

score 0 · Accepted Answer

尝试这个：

HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(myContent);
var r = doc.DocumentNode.Descendants();
var htmlTextBox = doc.DocumentNode.Descendants().FirstOrDefault(x => x.Name=="input" && x.Id=="login-password");
if (htmlTextBox != null)
{
    var passwordBoxHtml = htmlTextBox.OuterHtml;
}

这为您提供<input id="login-password" name="password" req="req" type="password" value="" maxlength="64">了passwordBoxHtml.

为此，您必须使用HtmlAgilityPack可从nuget

c# - 来自http响应内容c#的具体值

2 回答 2

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