Question

I’m in the process of creating a framework in which I provide the base class and the implementers of the framework will inherit from the base class and provide additional properties and methods. In the base class, I would like to have a way of observing when a property value is changed. The property can be from the base class or in any of the subclasses. I know that through reflection, I can determine the list of properties from any instance, but is there a way I can track the property changing value?

Here is a very simplistic example of what I am saying:

public class BaseClass
{
    public string BaseClassProperty { get; set; }

    public void DoSomethingWhenEitherPropertyGetsChanged()
    {

    }
}

public class SubClass : BaseClass
{
    public string SubClassProperty { get; set; }
}

What can I do to have DoSomethingWhenEitherPropertyGetsChanged get executed when either of the properties has it’s value changed.

Answer 1

You can use notifypropertyweaver for this purpose. It does exactly what you want. Here’s a link:

• notifypropertyweaver

From the open source home page:

Uses IL weaving (via http://www.mono-project.com/Cecil) to inject INotifyPropertyChanged code into properties.

• No attributes required
• No references required
• No base class required
• Supports .net 3.5, .net 4, Silverlight 3, Silverlight 4, Silverlight 5 and Windows Phone 7
• Supports client profile mode