为什么 XDocument.Parse 会抛出 NotSupportedException? [英] Why does XDocument.Parse throw NotSupportedException?

问题描述

我正在尝试使用 XDocument.Parse 解析 xml 数据 wchich 抛出 NotSupportedException，就像在主题中一样:Windows Phone 7 中的 XDocument.Parse 是否不同? 我根据发布的建议更新了我的代码，但它仍然没有帮助.前段时间我使用类似(但更简单)的方法解析 RSS，效果很好.

I am trying to parse xml data using XDocument.Parse wchich throws NotSupportedException, just like in topic: Is XDocument.Parse different in Windows Phone 7? and I updated my code according to posted advice, but it still doesn't help. Some time ago I parsed RSS using similar (but simpler) method and that worked just fine.

public void sList()
        {

            WebClient client = new WebClient();

            client.Encoding = Encoding.UTF8;
            string url = "http://eztv.it";
            Uri u = new Uri(url);
            client.DownloadStringAsync(u);
            client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);


        }

    private void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        try
        {
            string s = e.Result;
            s = cut(s);

            XmlReaderSettings settings = new XmlReaderSettings();
            settings.DtdProcessing = DtdProcessing.Ignore;


            XDocument document = null;// XDocument.Parse(s);//Load(s);
            using (XmlReader reader = XmlReader.Create(new StringReader(e.Result), settings))
            {
                document = XDocument.Load(reader); // error thrown here
            }

            // ... rest of code
        }
        catch (Exception ex)
        {
            MessageBox.Show( ex.Message);
        }

    }

    string cut(string s)
    {
        int iod = s.IndexOf("<select name="SearchString">");
        int ido = s.LastIndexOf("</select>");

        s = s.Substring(iod, ido - iod + 9);

        return s;
    }

当我用字符串 s 代替

When I substitute string s for

//string s = "<select name="SearchString"><option value="308">10 Things I Hate About You</option><option value="539">2 Broke Girls</option></select>";

一切正常，没有抛出异常，那么我做错了什么?

Everything works and no exception is thrown, so what do I do wrong?

推荐答案

有像‘&’这样的特殊符号在 e.Result.

There are special symbols like '&' in e.Result.

我只是尝试用 HttpUtility.HtmlEncode() 和 XDocument 解析它

I just tried replace this symbols (all except '<', '>', '"') with HttpUtility.HtmlEncode() and XDocument parsed it

更新:

我不想展示我的代码，但你没有给我机会:)

I didn't want to show my code, but you left me no chance :)

 string y = "";
 for (int i = 0; i < s.Length; i++)
 {
      if (s[i] == '<' || s[i] == '>' || s[i] == '"')
      {
           y += s[i];
      }
      else
      {
           y += HttpUtility.HtmlEncode(s[i].ToString());
      }
 }
 XDocument document = XDocument.Parse(y);
 var options = (from option in document.Descendants("option")
      select option.Value).ToList();

它在 WP7 上对我有用.请不要将此代码用于 html 转换.我写得很快，只是为了测试目的

It's work for me on WP7. Please, do not use this code for html conversion. I wrote it quickly just for test purposes

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