解析xml谷歌日历事件

时间:2013-02-18 13:54:44

标签: c# xml windows-phone google-calendar-api

我正在尝试从此网址解析Google日历活动:http://www.google.com/calendar/feeds/amchamlva%40gmail.com/public/full 这是我的代码:

 static IEnumerable<Event> getEntryQuery(XDocument xdoc)
    {
        return from entry in xdoc.Root.Elements().Where(i => i.Name.LocalName == "entry")
               select new Event
               {
                   EventId = entry.Elements().First(i => i.Name.LocalName == "id").Value,
                   Published = DateTime.Parse(entry.Elements().First(i => i.Name.LocalName == "published").Value),
                   Title = entry.Elements().First(i => i.Name.LocalName == "title").Value,
                   Content = entry.Elements().First(i => i.Name.LocalName == "content").Value,
                   Where = entry.Elements().First(i => i.Name.LocalName == "gd:where").FirstAttribute.Value,
                   Link = entry.Elements().First(i => i.Name.LocalName == "link").Attribute("href").Value,

               };
    }

using (StreamReader httpwebStreamReader = new StreamReader(e.Result))
            {
                var results = httpwebStreamReader.ReadToEnd();

                XDocument doc = XDocument.Parse(results);

                System.Diagnostics.Debug.WriteLine(doc);

                var myFeed = getEntryQuery(doc);
                foreach (var feed in myFeed)
                {
                    System.Diagnostics.Debug.WriteLine(feed.Content);

                }

            }

它的工作原理几乎没有,除了这个:

Where = entry.Elements().First(i => i.Name.LocalName == "gd:where").FirstAttribute.Value,

我得到一个异常可能是因为它的值为null,实际上我需要获取valueString属性值(例如在这种情况下为'Somewhere')

<gd:where valueString='Somewhere'/>

3 个答案:

答案 0 :(得分:2)

&#39; GD&#39;看起来像一个命名空间,看看如何在LINQ to XML中使用xml命名空间:

http://msdn.microsoft.com/en-us/library/bb387093.aspx

http://msdn.microsoft.com/en-us/library/bb669152.aspx

也许尝试一下

XNamespace gdns = "some namespace here";
entry.Elements(gdns + "where")

答案 1 :(得分:2)

<gd:where>本地名称仅为where - gd部分是命名空间别名。

如果您只使用正确的完全限定名称,而不是使用所有这些First调用检查本地名称,那么它将很多更清洁。例如:

XNamespace gd = "http://schemas.google.com/g/2005";
XNamespace atom = "http://www.w3.org/2005/Atom";

return from entry in xdoc.Root.Elements(gd + "entry")
       select new Event
       {
           EventId = (string) entry.Element(atom + "id"),
           Published = (DateTime) entry.Element(atom + "published"),
           Title = (string) entry.Element(atom + "title"),
           Content = (string) entry.Element(atom + "content"),
           Where = (string) entry.Element(gd + "where")
           Link = (string) entry.Element(atom + "link")
       };

(这是基于某些documentation对名称空间做出有根据的猜测。你应该根据你的实际Feed确认这一点。)

答案 2 :(得分:2)

感谢您的帮助,它适用于这个简单的代码:

   //Where = entry.Elements().First(i => i.Name.LocalName == "where").Value,
   Where = entry.Elements().First(i => i.Name.LocalName == "where").Attribute("valueString").Value,

稍后我会尝试实施您的建议以获得更好的代码实现;)