Check Properties of a Class-Property that is a List of objects

Question

I have a class and some of the class properties are Lists of classes. I wanna now run through all the elements in the List. But whatever I try I can't grab the objects within the list. Does anyone have a workaround for my problem?

 public class car 
 {
    public int id {get; set;}
    public Tire attribute {get; set;}
 }

 public class Tire
 {
    public int id {get; set;}
    public double value {get; set;}
 }

And here my main that creates some classes and the list:

 public class Program
 {
    static void Main(string[] args)
    {
       Tire black = new Tire()
       {
          id = 5
       };
       Tire red = new Tire()
       {
          id = 8
       };
       Tire purple = new Tire()
       {
          id = 10
       };

       //Create my List
       List<Tire> mylist = new List<Tire>();
       List.Add(black);
       List.Add(red);
       List.Add(purple);


       //Define the car
       car mycar = new car()
       {
          id = 20,
          Tire = mylist
       };

I now wanna run through all the elements in my Tire-property-list, but whatever I do I never get the actual object (black, red and purple) within the List-Property. This is what I tried so far:

var type = car.GetType();
var properties = type.GetProperties();
foreach (var propertyInfo in properties)
{
    if (propertyInfo.ToString().Contains("List"))
    {
        var propValue = propertyInfo.GetValue(this);
        ...

If I Debug and look into the propValue variable I see all my three objects but I can't find a method to actually check them and get their properties again...

Answer 1

There are many problems in your implementation:

When you populate your list:

//Create my List
List<Tire> mylist = new List<Tire>();
List.Add(black);
List.Add(red);
List.Add(purple);

If you want to add your tire in your list, it should be:

//Create my List
List<Tire> mylist = new List<Tire>();
mylist.Add(black);
mylist.Add(red);
mylist.Add(purple);

In your class Structure

Your car has several tires, right? So the class should have a list of tires, not only a tire:

public class Car 
{
    public int Id {get; set;}
    public List<Tire> TireList {get; set;}
}

When you want to instantiate your car

Your mylist is not accessible inside the constructor call, you must set it up once the constructor has been called (or create a constructor that can have a list of tires in parameter):

//Define the car
Car mycar = new Car()
{
    Id = 20
};

mycar.TireList = mylist;

QUICK WORKING DEMO

I did not solved every problem, but here is a working sample (ConsoleApp):

class Program
{
    static void Main(string[] args)
    {
        Tire black = new Tire()
        {
            Id = 5
        };
        Tire red = new Tire()
        {
            Id = 8
        };
        Tire purple = new Tire()
        {
            Id = 10
        };

        //Create my List
        List<Tire> mylist = new List<Tire>();
        mylist.Add(black);
        mylist.Add(red);
        mylist.Add(purple);


        //Define the car
        Car mycar = new Car()
        {
            Id = 20
        };

        mycar.TireList = mylist;

        foreach (var tire in mycar.TireList)
        {
            Console.WriteLine(tire.Id);
        }

        Console.ReadKey();
    }
}

public class Car
{
    public int Id { get; set; }
    public List<Tire> TireList { get; set; }
}

public class Tire
{
    public int Id { get; set; }
    public double Value { get; set; }
}

Note

Last but not least, be careful with the use of caps in the name of your objects