使用LINQ查詢枚舉Descents

Question

我想解析下列XML文件到列表中。不幸的是，只返回一個元素

示例XML

<Titles> 
     <Book Title ="Love Story" Author= "Erich Segal" Year = "1999"/> 
     <Book Title ="Code Complete" Author= "Steve McConnel" Year = "2004"/> 
     <Book Title ="Rework" Author = "Jaso Fried" Year = "2010"/> 
     <Book Title ="Delivering Happiness" Author= "Tony Hseigh" Year = "2011"/> 
    </Titles> 

C＃代碼

public class BookInfo 
    { 
     public string Title { get; set; } 

     public string Author { get; set; } 

     public int Year { get; set; } 
    } 

XDocument xmlDoc = XDocument.Load(strXMLPath); 
var b = from device in xmlDoc.Descendants("Titles") 
         select new BookInfo 
         { 
          Title = device.Element("Book").Attribute("Title").Value, 
          Author = device.Element("Book").Attribute("Author").Value, 
          Year = int.Parse(device.Element("Book").Attribute("Year").Value) 
         }; 

      books = b.ToList(); 

Answer 1

我懷疑你實際上希望被找到後人稱之爲 「書」，而不是 「標題」：

XDocument xmlDoc = XDocument.Load(strXMLPath); 
var b = from book in xmlDoc.Descendants("Book") 
     select new BookInfo 
     { 
      Title = (string) book.Attribute("Title"), 
      Author = (string) book.Attribute("Author"), 
      Year = (int) book.Attribute("Year") 
     }; 
var books = b.ToList(); 

或在非查詢表達式中ñ語法：

XDocument xmlDoc = XDocument.Load(strXMLPath); 
var books = xmlDoc.Descendants("Book") 
        .Select(book => new BookInfo 
          { 
           Title = (string) book.Attribute("Title"), 
           Author = (string) book.Attribute("Author"), 
           Year = (int) book.Attribute("Year") 
          }) 
        .ToList(); 

---

編輯：如果你想所有元素從Titles下降（例如排除來自其他地方的「書」的元素），你會想：

XDocument xmlDoc = XDocument.Load(strXMLPath); 
var books = xmlDoc.Descendants("Titles") 
        .Descendants("Book") 
        .Select(book => /* same as before */)