使用具有多个后代的Linq解析XML

Question

我有一个问题来解析多个XML字段

这是XML的风格:

<students>
  <student>
    <student_id>1</student_id>
    <student_name>Mike</student_name>
    <subjects>
      <subject>
        <school_subject>History</school_subject>
      </subject>
      <subject>
        <school_subject>Maths</school_subject>
      </subject>
      <subject>
        <school_subject>English</school_subject>
      </subject>
    </subjects>
  </student>
  <student>
    ...
  </student>
</students>

我可以解析像student_id和student_name这样的简单字段,但是当同一个字段有多次重复时我不知道该怎么做:/这是我解析的源代码.

我做了两节课:

• 主题包含学校科目的名称
• 包含id和名称以及类Subject的列表的学生.

现在源代码:

List<Student> L1 = new List<Student>();

XDocument doc = XDocument.Load(s);
var q = from b in doc.Descendants("student")
select new
{
    s_id = (string)b.Element("student_id"),
    s_name = (string)b.Element("student_name"),
    s_subject = (Subject)b.Elements("school_subject")
};
foreach (var p in q)
{
    L1.Add(new Student() { id = p.s_id, name = p.s_name, subject = p.s_subject });
}
listBox1.ItemsSource = L1;

感谢您阅读并抱歉我非常糟糕的英语.

Answer 1

根据你的xml学生可以有几个科目.因此,您需要收集作为学生财产的科目:

public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Subject> Subjects { get; set; }
}

public class Subject
{
    public string Name { get; set; }
}

这里是解析.要填写学生的科目,您需要进行子查询:

XDocument xdoc = XDocument.Load(s);
IEnumerable<Student> students =
    from s in xdoc.Descendants("student")
    select new Student()
    {
        Id = (int)s.Element("student_id"), // you can cast to int
        Name = (string)s.Element("student_name"),
        Subjects = s.Element("subjects") // here goes sub query
                    .Elements("subject")
                    .Select(subj => new Subject() { 
                       Name = (string)subj.Element("school_subject") 
                    }).ToList()
    };

BTW我认为你可以用简单的字符串来保存主题名称 - 你真的不需要上课.