Hide Table of Contents

Undo Feature and Fire Undo Post-Notify Event Example (C#)

This example shows how to fire an undo post-notification in a part.

// Preconditions: Open public_documents\samples\tutorial\api\cstick.sldprt.
// Postconditions:
// 1. Creates a cut-extrude feature on the top face of the
//    candlestick.
// 2. Undoes the cut-extrude feature and fires an undo post-notification.
// 3. Click OK to close the message box.
// 4. Deletes the cut-extrude sketch and all absorbed features.
// NOTE: Because the part 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 UndoPostNotifyCSharp.csproj


    partial class SolidWorksMacro


        public PartDoc swPart;

        public void Main()


            ModelDoc2 swModel;

            ModelDocExtension swModelDocExt;

            SketchManager swSketchManager;

            SketchSegment swSketchSegment;

            FeatureManager swFeatureManager;

            Feature swFeature;

            bool boolstatus = false;


            Hashtable openPart;


            swModel = (ModelDoc2)swApp.ActiveDoc;


            // Set up event notification

            swPart = (PartDoc)swModel;

            openPart = new Hashtable();



            // Create a cut-extrude feature on the

            // top face of the candlestick

            swModelDocExt = swModel.Extension;

            boolstatus = swModelDocExt.SelectByID2("", "FACE", 0.00140404215739, 0.2199999999999, 0.001897848026772, false, 0, null, 0);

            swSketchManager = swModel.SketchManager;

            swSketchSegment = swSketchManager.CreateCircle(0.0, 0.0, 0.0, 0.01296, -0.006347, 0.0);


            boolstatus = swModelDocExt.SelectByID2("Arc1", "SKETCHSEGMENT", 0, 0, 0, false, 0, null, 0);

            swFeatureManager = swModel.FeatureManager;

            swFeature = swFeatureManager.FeatureCut(true, false, false, 0, 0, 0.01, 0.01, false, false, false,

            false, 0.01745329251994, 0.01745329251994, false, false, false, false, false, true, true




            // Undo the cut-extrude feature



            // Fire undo notification


            // Select the circle and delete it

            boolstatus = swModelDocExt.SelectByID2("Arc1", "SKETCHSEGMENT", 0, 0, 0, false, 0, null, 0);

            boolstatus = swModelDocExt.DeleteSelection2((int)swDeleteSelectionOptions_e.swDelete_Absorbed);





        public void AttachEventHandlers()





        public void AttachSWEvents()


            swPart.UndoPostNotify += this.swPart_UndoPostNotify;



        public int swPart_UndoPostNotify()


            //Show message after undo action occurs

           // NOTE: Because the message box might 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;



        /// <summary>

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

        /// </summary>

        public SldWorks swApp;



Provide feedback on this topic

SOLIDWORKS welcomes your feedback concerning the presentation, accuracy, and thoroughness of the documentation. Use the form below to send your comments and suggestions about this topic directly to our documentation team. The documentation team cannot answer technical support questions. Click here for information about technical support.

* Required

Subject:   Feedback on Help Topics
Page:   Undo Feature and Fire Undo Post-Notify Event Example (C#)
*   I acknowledge I have read and I hereby accept the privacy policy under which my Personal Data will be used by Dassault Systèmes

Print Topic

Select the scope of content to print:


We have detected you are using a browser version older than Internet Explorer 7. For optimized display, we suggest upgrading your browser to Internet Explorer 7 or newer.

 Never show this message again

Web Help Content Version: API Help (English only) 2019 SP05

To disable Web help from within SOLIDWORKS and use local help instead, click Help > Use SOLIDWORKS Web Help.

To report problems encountered with the Web help interface and search, contact your local support representative. To provide feedback on individual help topics, use the “Feedback on this topic” link on the individual topic page.