generic collection with anonymous types

[mironline]

dear friends

I have a problem with generic collection with anonymous types;

my code is :

 public class BASE
    {
    public List<????> CreateCollection(){
        List<????> x = new List<????>;
        object o = Activator.CreateInstance(GetType());
                o = Convert.ChangeType(o, GetType());
        x.Add((????) o);
    return x;
    }
    }
 
    public class class_1 : BASE{.....}
    public class class_2 : BASE{.....}
 
 

Test Code

 
 
    class_1 c = new class_1;
    List<class_1> list1 = c.CreateCollection();
    // I want to get the collection of class_1 with CreateCollection Method;
 
    class_2 c = new class_2;
    List<class_2> list2 = c.CreateCollection();
    // I want to get the collection of class_2 with CreateCollection Method;
 

thank you;

[Christian Binder]

Hi,

you could try to do the following:

  public class BASE {
    protected List<T> CreateCollection<T>() where T : BASE {
      List<T> x = new List<T>();
      object o = Activator.CreateInstance(GetType());
      o = Convert.ChangeType(o, GetType());
      x.Add((T)o);
      return x;
    }
  }
 
   public class class_1 : BASE {
     public List<class_1> CreateCollection() {
       return base.CreateCollection<class_1>();
     }
   }
 
   public class class_2 : BASE {
     public List<class_2> CreateCollection() {
       return base.CreateCollection<class_2>();
     }
   }
 

Your base-class has a generic method, returning a list of anything derived of BASE. It can't be called from outside because of the protected-keyword.

[IanWright]

@mironline
But you never stated what your problem is???