遍历类属性以获取子类值

Question

好的，我正在尝试使用反射来遍历一个类以获取该类和子类的所有属性和值。我遇到的问题是获取一个类的值，该类是我正在使用的对象的子类。例如。我想在下面的示例中获取 Teacher 对象的 ClassRoom 属性。

我遇到的另一个问题是如何确定何时获得可包含的属性，例如学生列表，以便我可以让它遍历列表。

例如：

public class Teacher 
{
    public int ID {get;set;}
    public string FullName {get;set;}
    public ClassRoom HomeRoom {get;set;}
    public List<Student> Students {get;set;}
}
public class ClassRoom
{
    public int ID {get;set;}
    public string RoomNumber {get;set;}
}
public class Student
{
    public int ID {get;set;}
    public string FullName {get;set;}
}

private void LoadTeacher()
{
    Teacher thisTeacher = Session["Teacher"] as Teacher;
    Type type = thisTeacher.GetType();

    PropertyInfo[] props = type.GetProperties();
    foreach (PropertyInfo prop in props)
    {
        if (prop.PropertyType.IsClass && prop.PropertyType != typeof(string))
        {
            Type headerType = prop.PropertyType;
            PropertyInfo[] headerProps = headerType.GetProperties();
            //Instantiate an object of the headerType
            object headerObj = Activator.CreateInstance(headerType);
            foreach (PropertyInfo childProp in headerProps)
            {
                if (!childProp.PropertyType.IsClass || childProp.PropertyType == typeof(string))
                {
                    //This object always get loaded with default values, Why?
                    object value = childProp.GetValue(headerObj, null);                                                    
                }
            }
        }
    }
}

Answer 1

   var teacher = new Teacher()
    {
      HomeRoom = new ClassRoom { ID = 12, RoomNumber = "7-1" },
      Students = new List<Student> { new Student{ID =1, FullName = "Smith1"}, new Student{ID=2, FullName = "Smith2"} }
    };
    Console.WriteLine("Teacher");
    Browse(teacher, 1);

 static void Browse(object item, int level = 0)
  {
    if (item == null)
      return;
    var prefix = new string(' ', level * 2);

    var type = item.GetType();
    foreach (var prop in type.GetProperties())
    {
      var value = prop.GetValue(item, null);
      if (value is System.Collections.IEnumerable && !(value is string))
      {
        Console.WriteLine("{0}{1}", prefix, prop.Name);
        foreach (var index_entry in ((System.Collections.IEnumerable)value).OfType<object>().Select((entry, index) => new { entry, index }))
        {
          Console.WriteLine("{0}[{1}]: {2}", prefix, index_entry.index, index_entry.entry);
          Browse(index_entry.entry, level + 1);
        }
      }
      else if (value != null && !value.GetType().IsPrimitive && !(value is string))
      {
        Console.WriteLine("{0}{1}: {2}", prefix, prop.Name, value);
        Browse(value, level + 1);
      }
      else
      {
        Console.WriteLine("{0}{1}: {2}", prefix, prop.Name, value);
      }

    }
  }

输出

Teacher
  ID: 0
  FullName:
  HomeRoom: Program+ClassRoom
    ID: 12
    RoomNumber: 7-1
  Students
  [0]: Program+Student
    ID: 1
    FullName: Smith1
  [1]: Program+Student
    ID: 2
    FullName: Smith2