Artículo 3. Figura 1

A3F1.cs

public class Machine
{
    public Machine()
    {
    } 

    private string Components { get; set; }

    public List<string> GetComponents()
    {
        return String.IsNullOrEmpty(this.Components) 
            ? new List<string>() 
            : this.Components.TrimEnd(';').Split(';').Select(m => m).ToList();
    }
    private void SetComponents(List<string> components)
    {
        this.Components = string.Join(";", components ?? new List<string>());
    }
    public void AddComponent(string component)
    {
        List<string> components = this.GetComponents();
        if(components.Contains(component))
        {
            return;
        }        
        components.Add(component);
        this.SetComponents(components);
    }
    public void RemoveComponent(string component)
    {
        List<string> components = this.GetComponents();
        components.Remove(component);
        this.SetComponents(components);
    }    
}

public class Component
{
    public Component()
    {
    }

    private string _id;  
    private string _name;
    
    public string GetId()
    {
        return this._id;
    }
    public void SetId(string Id)
    {
        this._id = Id;
    }    
    public string GetName()
    {
        return this._name;
    }
    public void SetName(string name)
    {
        this._name = name;
    }       
}