如何获取XML的属性值使用LINQ to XML？ [英] How to get the attribute value of xml using LINQ to XML?

问题描述

我有以下xml模式。

 < Rooms& 
< Room RoomNumber =room1EMAIL =[e-mail] =/> 
< Room RoomNumber =room2EMAIL =[e-mail] =/> 
< / Rooms> 
  

我必须根据输入返回电子邮件地址p>

我如何使用LINQ to XML实现？

解决方案

  var doc = XDocument.Load（myXmlFilePath）; 
 //或doc = XDocument.Parse（myXmlString）; 
 
 string roomNumber =room1; 
 
 var emailQuery = doc.Root.Elements（Room）中的房间
其中（string）room.Attribute（RoomNumber）== roomNumber 
 select ）room.Attribute（EMAIL）; 
  

然后，使用类似的查询，您可以得到结果：

  //如果总是只有一个< Room> with given roomNumber 
 var email = emailQuery.First（）; 
 //否则
 var emails = emailQuery.ToList（）; 
  

I have the following xml schema.

<Rooms>
    <Room RoomNumber="room1" EMAIL="[e-mail]" dsfdd=""/>
    <Room RoomNumber="room2" EMAIL="[e-mail]" dsfdd=""/>
</Rooms>

I have to return Email address based on the input(input to program is room number).

How i can achieve this using LINQ to XML?

解决方案

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");

Then, with a query like that you can get results:

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

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