I would like to use the DebuggerTypeProxy attribute to show, in Debug, a class using Datatable.
I try to better explain what I mean.
I can tell VS to show a class using another proxy class. So if I have a list I can tell him to visualize that list after putting all the data's in a Datatable. So I can use the standard DebugVisualizer for datatables.
There are a few ways to provide custom debugging visualization,
Use [DebuggerDisplay] attribute
[DebuggerDisplay("Point {X}:{Y}")]
public class Point
{ public int X {get;set;} public int Y {get;set;} }
use DebuggerBrowsableDisplay attribute and set the State property to DebuggerBrowsableState.RootHidden - it will alow you to show collections like you have already pressed +
DebuggerTypeProxy attribute - for any custom visualizer.
But personally i wouldnt bother with writing a custom visualizer for the problem that you are describing - there are already debugging products that can do it for you. You can download OzCode, VS extencion that is still free in its beta and use its Reveal feature:
http://o.oz-code.com/features#reveal
It seems to be exactly what you need :)