如何使用LINQ to XML獲取xml的屬性值？

Question

我有以下xml架構。

<Rooms> 
    <Room RoomNumber="room1" EMAIL="ssds@dsfd.com" dsfdd=""/> 
    <Room RoomNumber="room2" EMAIL="ssds@sdd.com" dsfdd=""/> 
</Rooms> 

我必須根據輸入返回電子郵件地址（輸入到程序是房間號碼）。

如何使用LINQ to XML實現這一點？

Answer 1

var doc = XDocument.Load(myXmlFilePath); 
// or doc = XDocument.Parse(myXmlString); 

string roomNumber = "room1"; 

var emailQuery = from room in doc.Root.Elements("Room") 
       where (string)room.Attribute("RoomNumber") == roomNumber 
       select (string)room.Attribute("EMAIL"); 

然後，就像你可以得到結果的查詢：

// if there is always only one <Room> with given roomNumber 
var email = emailQuery.First(); 
// otherwise 
var emails = emailQuery.ToList(); 

Answer 2

試試這個：

var xml = XElement.Parse("<Rooms>"+ 
       "<Room RoomNumber=\"room1\" EMAIL=\"ssds@dsfd.com\" dsfdd=\"\"/>"+ 
     "<Room RoomNumber=\"room2\" EMAIL=\"ssds@sdd.com\" dsfdd=\"\"/>"+ 
       "</Rooms>"); 

string room = "room1"; //input 
var email = xml.Elements("Room") 
         .Where(c => c.Attribute("RoomNumber").Value == room) 
         .Select(c => c.Attribute("EMAIL").Value).FirstOrDefault();