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Undo Deleted Note and Fire Undo Pre- and Post-Notify Events Example (C#)

This example demonstrates firing Undo pre- and post-notification events in a drawing document.

// Preconditions: Open public_documents\samples\tutorial\AutoCAD\7550-021.slddrw.
// Postconditions:
// 1. Selects and deletes the note in Drawing View1.
// 2. Undoes the deleted note.
// 3. Fires pre-notification event indicating that an undo action is about to
//    occur and fires post-notification event indicating that an undo
//    action occurred.
// 4. Click OK to close each message box.
// NOTE: Because the drawing is used elsewhere, do not save changes.

using SolidWorks.Interop.sldworks;

using SolidWorks.Interop.swconst;

using System;

using System.Collections;

using System.Windows.Forms;

namespace UndoPostNotifyDrawingCSharp.csproj


partial class SolidWorksMacro


    public DrawingDoc swDrawing;


    public void Main()


        ModelDoc2 swModel = default(ModelDoc2);

        ModelDocExtension swModelDocExt = default(ModelDocExtension);

        bool boolstatus = false;

        Hashtable openDrawing = default(Hashtable);


        swModel = (ModelDoc2)swApp.ActiveDoc;

        swModelDocExt = (ModelDocExtension)swModel.Extension;


        // Event notification

        swDrawing = (DrawingDoc)swModel;

        openDrawing = new Hashtable();



        // Activate the drawing view that contains

        // the note you want to delete

        boolstatus = swDrawing.ActivateView("Drawing View3");

        boolstatus = swModelDocExt.SelectByID2("DetailItem77@Drawing View3", "NOTE", 0.3058741216774, 0.1870419466786, 0, false, 0, null, 0);


        // Delete the selected note



        // Undo deletion of note



        // Post-notification is fired


        // Rebuild the drawing




    public void AttachEventHandlers()





    public void AttachSWEvents()


        swDrawing.UndoPostNotify += this.swDrawing_UndoPostNotify;

        swDrawing.UndoPreNotify += this.swDrawing_UndoPreNotify;



    private int swDrawing_UndoPostNotify()


        // Display message after Undo

        // NOTE: Because the message box may be displayed

        // behind an opened window, you might not see it.

        // If so, then check the Taskbar.        

        MessageBox.Show("An undo post-notification event has been fired.");

        return 1;



    private int b()


        // Display message after Undo

        // NOTE: Because the message box may be displayed

        // behind an opened window, you might not see it.

        // If so, then check the Taskbar.

        MessageBox.Show("An Undo pre-notification event has been fired.");

        return 1;



    /// <summary>

    /// The SldWorks swApp variable is pre-assigned for you.

    /// </summary>

    public SldWorks swApp;





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