Missing regen after editing a block definition, or after its undo

[stefanome]

I have a command that changes the definition of a block.

After executing the command, the already existing instance of the block doesn't show the update until a REGEN is executed. 

I have added Editor.Regen() at the end of the function, right after it has finished updating the block definition, and now I see the updated block.

The problem is that if, after executing the command, I undo, the block definition goes back to its previous condition, but the existing instance doesn't show the update until a manual REGEN. Again, the undo doesn't know that a REGEN is required.

The command already has the CommandFlags.Redraw flag.

Is adding the Editor.Regen() the correct solution?

If yes, how do I make sure the block is regenerated after undo?

[ActivistInvestor · Accepted solution]

Autodesk.AutoCAD.Internal.CoreUtils.SetUndoRequiresRegen(Darabase db)

[stefanome]

Thank you, that's exactly what I need!

It's a little scary that searching for it in the whole autodesk.com doesn't find any matches: https://www.google.com/search?q=site%3Aautodesk.com+SetUndoRequiresRegen

Where and how did you find this function?

[ActivistInvestor]

It is an undocumented API that was intended for internal use only. The primary means of discovering this kind of stuff is by using a decompiler/disassembler like IlSpy

[stefanome]

I'm not decompiler ready yet!

For the time being I'm happy that you gave me the correct solution.

And I'm happy that I wasn't missing some obvious piece of documentation.