将 XML Linq 语句转换为 JSON答案

【问题标题】：Converting XML Linq statement to JSON将 XML Linq 语句转换为 JSON
【发布时间】：2011-01-17 21:28:41
【问题描述】：

我目前正在使用 linq 解析移动应用程序的 XML 提要，代码如下：

            var Questions = from myQuestion in IXML.Descendants("item")
                            let Anonymous = myQuestion.Element("asked_by").HasElements == false
                            let Identifiable = myQuestion.Element("asked_by").HasElements == true
                            where Identifiable || Anonymous
                            select new Question
                            {
                                AskedQuestion = ParseText.PlainText(myQuestion.Element("question").Value),
                                ID = Convert.ToInt64(myQuestion.Element("id").Value),
                                Author_UserName = (Identifiable ? (String)ParseText.PlainText(myQuestion.Element("asked_by").Element("username").Value) : String.Empty),
                                Author_RealName = (Identifiable ? (String)ParseText.PlainText(myQuestion.Element("asked_by").Element("name").Value.ToLower()) : "anonymous"),
                                Author_PhotoURL = (Identifiable ? (String)ParseText.PlainText(myQuestion.Element("asked_by").Element("photo_url").Value) : String.Empty)
                            };

现在，我已改用 JSON 提要，因为它具有较小的下载大小（它是一个移动应用程序）的优势，并且我正在使用 JSON.NET。但是，我似乎无法完全正确地获得 linq 语句？我不是这方面的任何专家，我在任何地方都找不到任何有用的指示，所以这里就是我所拥有的：

var Questions = from m in o["response"].Children()
                              let Anonymous = m["asked_by"].Values() == null
                              let Identifiable = m["asked_by"].Values() != null
                              where Identifiable || Anonymous
                              select new Question
                              {
                                  AskedQuestion = ParseText.PlainText((string)m["question"]),
                                  ID = (Int64)m["id"],
                                  Author_UserName = (Identifiable ? (String)ParseText.PlainText((string)m["asked_by"]["username"]) : String.Empty),
                                  Author_RealName = (Identifiable ? (String)ParseText.PlainText((string)m["asked_by"]["name"]) : "anonymous"),
                                  Author_PhotoURL = (Identifiable ? (String)ParseText.PlainText((string)m["asked_by"]["photo_url"]) : String.Empty)
                              };

不幸的是，这不起作用 - 我假设我正在选择匿名/可识别磨损的条件，但我不知道该怎么做。还有，不知什么原因

ID = (Int64)m["id"]

也不行，

这是我尝试解析的一些 JSON 字符串的 sn-p，如果有帮助的话：/

{"status":"ok","response":[{"id":"3740995599","question":"Have you ever had bumper stickers on your car? If so, what were they?","time":"Mon, 17 Jan 2011 14:44:29 -0500","asked_by":{"username":"ade","name":"Ade Olonoh","website":"http:\/\/about.me\/ade","location":"San Francisco, CA","bio":"Formspring CEO\/Founder","accept_anonymous":true,"protected":false,"photo_url":"http:\/\/files-cdn.formspring.me\/profile\/20100119\/4b56705e1b776_thumb.jpg","answered_count":718,"taking_questions":true,"is_following":true}},{"id":"3710380191","question":"who do you like?? ( :","time":"Sun, 16 Jan 2011 07:10:07 -0500","asked_by":""},{"id":"3708438239" ................"}] }

有什么想法吗？不胜感激，

谢谢大家！

【问题讨论】：

标签： .net xml silverlight linq json

【解决方案1】：

这可能有效：使用 JSON Serialization 中所述的 DataContractJsonSerializer。

// Assuming that 'questions' contains the data returned from the LINK statement.
var questionsStream = new MemoryStream();
DataContractJsonSerializer jsonSerializer
    = new DataContractJsonSerializer(typeof(questions));
jsonSerializer.WriteObject(questionsStream, questions);

var streamReader = new StreamReader(questionsStream);
string jsonOutput = streamReader.ReadToEnd();

我不确定对typeof 的调用是否有效，因为问题是匿名类型。如果没有，那么您必须声明一个类，并将结果复制到它。有点像这样：

[DataContract]
class Questions
{
    [DataMember]
    IEnumerable<Question> AllQuestions { get; set; }
}

var typedQuestions = new Questions();
typeQuesions.AllQuestions =
    from m in ...

【讨论】：