使用Linq查詢XML文檔

Question

我想Linq一個xml文檔，我無法查詢內部元素，因爲您可以從下面的代碼中看到我正在嘗試執行的操作。我想獲得所有具有特定名稱的記錄...請幫助。

<?xml version="1.0" encoding="utf-8" ?> 
<Student> 

<Person name="John" city="Auckland" country="NZ" /> 

<Person> 
    <Course>GDICT-CN</Course> 
    <Level>7</Level> 
    <Credit>120</Credit> 
    <Date>129971035565221298</Date> 
</Person> 
<Person> 
    <Course>GDICT-CN</Course> 
    <Level>7</Level> 
    <Credit>120</Credit> 
    <Date>129971036040828501</Date> 
</Person> 
</Student> 

而現在源

class Program 
{ 
    static void Main(string[] args) 
    { 
    string path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop); 
    XDocument xDoc = XDocument.Load(path + "\\Student Data\\data.xml"); 

    IEnumerable<XElement> rows = 
     from row in xDoc.Descendants("Person") 
      where (string)row.Attribute("Course") == "GDICT-CN" 
      select row; 

    foreach(XElement xEle in rows) 
    { 
     IEnumerable<XAttribute>attlist = 
      from att in xEle.DescendantsAndSelf().Attributes() 
       select att; 

     foreach(XAttribute xatt in attlist) 
     { 
      Console.WriteLine(xatt); 
     } 
     foreach (XElement elemnt in xEle.Descendants()) 
     { 
      Console.WriteLine(elemnt.Value); 
     } 
     Console.WriteLine("-------------------------------------------"); 
     } 
    Console.ReadLine(); 
    } 
} 

Answer 1

替換您LINQ where查詢與這一個 -

IEnumerable<XElement> rows = xDoc.Descendants().Where(d => d.Name == "Person" 
           && d.Descendants().Any(e => e.Name == "Course" 
           && e.Value == "GDICT-CN"));