如何从元标记中获取内容的价值？

问题描述

限时删除！！

我正在努力从元标记中获取值。到目前为止，我已经取得了成功，但我已经获得了如下所示的元标记：

I'm working on getting values from meta tags. So far I've gotten success but stuck at a point where i'm getting meta tag like below:

<meta content="/images/branding/googleg/1x/googleg_standard_color_128dp.png" itemprop="image">

通过此我无法提取其中的url字符串元标记的内容属性。



我尝试过：

through this i'm not able to extract url string which is in the content property of meta tag.

What I have tried:

Regex meta = new Regex(@"<meta\s*(?:(?:\b(\w|-)+\b\s*(?:=\s*(?:""[^""]*""|'" +
                          @"[^']*'|[^""'<> ]+)\s*)?)*)/?\s*>");

WebClient web = new WebClient();
					web.UseDefaultCredentials = true;
					string page = web.DownloadString(url);


                    WebClient client = new WebClient();

                    // Add a user agent header in case the
                    // requested URI contains a query.

                    client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");

                    Stream data = client.OpenRead(url);
                    StreamReader reader = new StreamReader(data);
                    string s = reader.ReadToEnd();
                    //Console.WriteLine(s);
                    data.Close();
                    reader.Close();



                    MatchCollection mc = meta.Matches(s);
                    int mIdx = 0;
                    foreach (Match m in mc)
                    {
                        for (int gIdx = 0; gIdx < m.Groups.Count; gIdx++)
                        {

                            metadata.Add(m.Groups[gIdx].Value);
                        }
                        mIdx++;
                    }

任何解决方案？

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