在 LINQ 的帮助下从 Xml 读取文本时出现问题

Question

程序从 LINQ 搜索中没有返回任何内容，仅返回 0（最终 = 0）。我使用了调试器，所以我认为问题出在 linq 类中，因为程序停在单词“where”处。我不明白哪里有错误。将非常感激。

if (checkLINQ.IsChecked == true)
{
    strategy = new LINQ();
    Final = strategy.Search(_scientist, _filePath);
}

public class LINQ : IStrategy
 {
  public LINQ() { }

        public ObservableCollection<Scientist> Search(Scientist s, string path)
  {
            ObservableCollection<Scientist> _s = new ObservableCollection<Scientist>();
   var doc = XDocument.Load(path);

var match = (from value in doc.Descendants("Scientist")
         where
            (s.Name == null || s.Name == value.Element("Name")?.Value) &&
         (s.AuthorName == null || s.AuthorName == value.Element("AuthorName")?.Value) &&
         (s.Faculty == null || s.Faculty == value.Element("Faculty")?.Value) &&
         (s.AuthorPosition == null || s.AuthorPosition == value.Element("AuthorPosition")?.Value) &&
         (s.Gender == null || s.Gender == value.Element("Gender")?.Value) &&
         (s.Age == null || == value.Element("Age")?.Value)
         select value).ToList();

   foreach (var obj in match)
   {
    Scientist sc = new Scientist();
    sc.Name = obj.Element("Name")?.Value ?? string.Empty; 
    sc.AuthorName = obj.Element("AuthorName")?.Value ?? string.Empty; 
    sc.Faculty = obj.Element("Faculty")?.Value ?? string.Empty; 
    sc.AuthorPosition = obj.Element("AuthorPosition")?.Value ?? string.Empty; 
    sc.Gender = obj.Element("Gender")?.Value ?? string.Empty; 
    sc.Age = obj.Element("Age")?.Value ?? string.Empty; 
    _s.Add(sc);
            }
   return _s;
  }
    }

Answer 1

请尝试以下解决方案。

c#

void Main()
{
    var result = Search(new Scientist
    {
        Name = "Роботи сучасності", 
        Age = "78"
    }, "https://raw.githubusercontent.com/Yuliia-1102/Lab-xml-linq-/main/Labaratory_2/Scientists.xml");
    Console.WriteLine(result);
}

public static List<Scientist> Search(Scientist s, string path)
{
    var doc = XDocument.Load(path);

    List<Scientist> Scientists = doc.Descendants("Scientist")
        .Where(x => x.Descendants("Name").Any(c => c?.Value == s.Name)
            || x.Descendants("AuthorName").Any(c => c?.Value == s.AuthorName)
            || x.Descendants("Faculty").Any(c => c?.Value == s.Faculty) 
            || x.Descendants("AuthorPosition").Any(c => c?.Value == s.AuthorPosition) 
            || x.Descendants("Gender").Any(c => c?.Value == s.Gender)
            || x.Descendants("Gender").Any(c => c?.Value == s.Gender)
            ||  x.Descendants("Age").Any(c => c?.Value == s.Age))
      .Select(x => new Scientist()
      {
          Name = x.Element("Name")?.Value,
          AuthorName = x.Element("AuthorName")?.Value,
          Faculty = x.Element("Faculty")?.Value,
          AuthorPosition = x.Element("AuthorPosition")?.Value,
          Gender = x.Element("Gender")?.Value,
          Age = x.Element("Age")?.Value
      }).ToList();
    return Scientists;
}

[XmlRoot(ElementName = "Scientist")]
public class Scientist
{
    [XmlElement(ElementName = "Name")]
    public string Name { get; set; }

    [XmlElement(ElementName = "AuthorName")]
    public string AuthorName { get; set; }

    [XmlElement(ElementName = "Faculty")]
    public string Faculty { get; set; }

    [XmlElement(ElementName = "AuthorPosition")]
    public string AuthorPosition { get; set; }

    [XmlElement(ElementName = "Gender")]
    public string Gender { get; set; }

    [XmlElement(ElementName = "Age")]
    public string Age { get; set; }
}

输出