Question

Why can’t I derive from GridViewRowPresenterBase?

public class GridViewRowPresenterEx : GridViewRowPresenterBase
{
    protected override void OnColumnPropertyChanged(GridViewColumn c, string s)
    {
    }
}

I’m getting the following compile errors:

‘GridViewRowPresenterEx’ does not implement inherited abstract member
System.Windows.Controls.Primitives.GridViewRowPresenterBase.OnColumnPropertyChanged(System.Windows.Controls.GridViewColumn,
string)’

‘GridViewRowPresenterEx.OnColumnPropertyChanged(System.Windows.Controls.GridViewColumn,
string)’: no suitable method found to override

Answer 1

The OnColumnPropertyChanged() method exposed by GridViewRowPresenterBase is internal abstract (you can see it in the source code here).

Unfortunately, there is no way to implement an internal abstract method outside of its original assembly. It looks like GridViewRowPresenterBase was designed to only be derivable by other classes in PresentationFramework.dll.