如何使用LINQ綁定xml中的特定屬性？

Question

我有正這樣的XML：

<Profile> 
    <Interviewer id="111"> 
    <Questions> 
     <Question qid="1" Catid="1" CatagoryName="General"> 
     <Video url="http://10.1.8.45/BIGWeb/videofiles/user1/I1C1Vid1.mp4" /> 
     <Quest text="Tell me about yourself by intone ?" /> 
     <videofile text="I1C1Vid1.mp4" /> 
     </Question> 
     <Question qid="2" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="What are your interestsone ?" /> 
     <videofile text="I1C1Vid2.mp4" /> 
     </Question> 
     <Question qid="3" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="What is you hobbyone ?" /> 
     <videofile text="I1C1Vid3.mp4" /> 
     </Question> 

    </Questions> 
    </Interviewer> 
    <Interviewer id="222"> 
    <Questions> 
     <Question qid="1" Catid="1" CatagoryName="General"> 
     <Video url="http://10.1.8.45/BIGWeb/videofiles/user1/I1C1Vid1.mp4" /> 
     <Quest text="Tell me about yourself by intone ?" /> 
     <videofile text="I2C1Vid1" /> 
     </Question> 
     <Question qid="2" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="What are your interestsone ?" /> 
     <videofile text="I2C1Vid2" /> 
     </Question> 
     <Question qid="3" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="What is you hobbyone ?" /> 
     <videofile text="I2C1Vid3" /> 
     </Question> 
     <Question qid="4" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="Your studiesone?" /> 
     <videofile text="I2C1Vid4" /> 
     </Question> 
     <Question qid="5" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="What you want to be in the futureone ?" /> 
     <videofile text="I2C1Vid5" /> 
     </Question> 
     <Question qid="6" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="What are your interests ?" /> 
     <videofile text="I2C1Vid6" /> 
     </Question> 
     <Question qid="7" Catid="1" CatagoryName="General"> 
     <Video /> 
     <Quest text="What is your hobby ?" /> 
     <videofile text="I2C1Vid7" /> 
     </Question> 
    </Questions> 
    </Interviewer> 
</profile> 

我想用url屬性和相應的錄像檔案和任務文本視頻。 注：我不希望在我的LINQ查詢視頻的空值......

這笏我做

var books = from Interviewer in xmlDocument.Descendants("Interviewer") 
      where Interviewer.Attribute("url").Value !=null 
     select new Data 
{ 
ques=(string)Interviewer.Element("Quest").Attribute("text").Value, 
videoid = (string)Interviewer.Element("videofile").Attribute("text").Value, 
videourl = (string)Interviewer.Element("Video").Attribute("url").Value 

}; 
return books.ToList(); 

它不工作請幫助... Thanx提前.... .................

Answer 1

我不能告訴你想要在你的LINQ查詢中做什麼，你在select中的東西不會出現在結果中組。您行：

where Interviewer.Attribute("url").Value !=null 

會導致面試官只包含有一個URL屬性，凡在你的選擇你有

(string)Interviewer.Element("videofile").Attribute("text").Value 
(string)Interviewer.Element("Quest").Attribute("text").Value 

面試官將不包含錄像檔案和任務元素的元素，因爲他們沒有url屬性。唯一會在採訪者中成爲視頻元素的是他們是唯一具有url屬性的元素。