.NET

[#1]

Hey everyone, In AutoCAD, i can type "erase" and then "last" into the commandline and it will automatically select and erase the last object i created. How is this accomplished in C#? I'm generating a polyline to automatically calculate areas, but i would like that polyline to vanish once the area has been measured. Thanks Vince

[#2]

Hi,

There is a SelectLast option:

PromptSelectionResult acSSPrompt;
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
acSSPrompt = ed.SelectLast();

Gaston Nunez

[#3]

Ok that helps, what would i use to delete what i selected with the editor?

Thanks

Vince

[#4]

Hi,

You should start a transaction, get the last object (as entity)  erase it (entity.erase), and commit the transaction and that's it. Like this (not tested, and translated from VB)

[CommandMethod("ELAST")]
public void EraseObj()
{
	Document acDoc = Application.DocumentManager.MdiActiveDocument;
	Database acCurDb = acDoc.Database;
	Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;

	using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction()) {
		PromptSelectionResult acSSPrompt;
		acSSPrompt = ed.SelectLast;
		Entity ent;
		SelectionSet ss = acSSPrompt.Value;

		if (ss.Count > 0) {
			ent = acTrans.GetObject(ss.Item(0).ObjectId, OpenMode.ForWrite);
			ent.Erase();
		}
		acTrans.Commit();
	}
}

Gaston Nunez

[#5]

I have not used it and of course 'not supported' but maybe you can search for

Autodesk.AutoCAD.Internal.Utils.EntLast();

and see if people have had success

[#6]

Thanks for this sample, i'm having an issue with the line:

 ent = acTrans.GetObject(ss.(0).ObjectId, OpenMode.ForWrite);

.

Visual Studio 2010 and AutoCAD 2012 are telling me that there is no definition for ss.item and thus i cannot compile. As i missing  a reference?

Thanks

Vince

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Colors;

[#7]

Thanks jeff, i'll have a look into this as well.

Cheers

Vince

[#8]

Hi,

SelectionSet  it's part of the EditorInput, and I see you are "using" it, so I have no idea why VS is telling you that. Any way the correct sintax is : ss(index).ObjectId without a dot after ss.

Gaston Nunez

[#9]

Ok, so i've got this now:

using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
PromptSelectionResult acSSPrompt;
acSSPrompt = ed.SelectLast();
Entity ent;
SelectionSet ss = acSSPrompt.Value;

if (ss.Count > 0)
{
ent = acTrans.GetObject(ss(0).ObjectId, OpenMode.ForWrite);
ent.Erase();
}
acTrans.Commit();
}
}
}
}

But the error I have is 'ss' is a 'variable' but is used like a 'method'

[#10]

Hi,

My mistake (i'm a vb guy), just change ss(0) by ss[0].

Gaston Nunez