Partial Class with Virtual Properties?

Question

Is it possible to have virtual properties within a partial class? In my scenario, we have auto-generated classes that are used by our Micro-ORM and map exactly to our database tables.

We often wish to extend these classes, however, so using partial keyword is absolutely fine in this case.

I have a situation, though, whereby I want to override the auto generated getter in a partial class.

eg:

public partial class MyClass {
   public int MyProperty{ get; set; }
}

.. I'd like to override the get and implement some custom logic without manipulating the auto-generated code. This is vital.

Thanks.

So you have autogenned non-virtual properties with no obvious extensibility hook and you want to "override" those with your own custom implementation in a select few cases? — Jon, Feb 12 '13 at 13:48
have you considered wrapping that propery in a new propety, and add the logic you need? — Jens Kloster, Feb 12 '13 at 13:53
I don't see any way that is possible using partial classes. You could however make the new class inherit from the auto-generated one and simply "overwrite" the property with the `new` keyword. Then it would depend upon which class instance you queried for the value returned. — John Willemse, Feb 12 '13 at 13:53
I should say that I would be happy to change the template for auto-generated classes to use virtual or some such if needed. I appreciate that just now, it would appear they classes are not suited to this type of thing. — pierre, Feb 12 '13 at 14:33

score 0 · Accepted Answer · answered Feb 12 '13 at 14:02

Maybe you can modify autogenerated classes to put gets and sets in other file. Example:

// file: MyClass_1.cs
public partial class MyClass
{
   public int MyProperty
   {
      get { this.MyPropertyGet(); }
      set { this.MyPropertySet(value); }
   }
}

And in other file:

// file: MyClass_2.cs
public partial class MyClass
{
   private int _myProperty;

   private int MyPropertyGet()
   {
      return _myProperty;
   }

   private void MyPropertySet(int value)
   {
      _myProperty = value;
   }
}

This would be a viable solution, though I will have to alter the auto-generated code creation to accommodate such a change. — pierre, Feb 12 '13 at 15:59

Partial Class with Virtual Properties?

1 Answers1