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Compare Selected Objects and Their Persistent Reference IDs Example (C#)

This example shows how to determine if two selected entities are the same entities and if those entities have the same persistent IDs.

NOTE: Using IModelDocExtension::IsSamePersistentID and ISldWorks::IsSame might be helpful when your application is passed two entities that it didn't select, and your application needs to know if they're the same entity.

//----------------------------------------------------------------------------
// Preconditions: 
// 1. Open a part document is open and select two
//    different entities (e.g., face, edge, vertex, etc.).
// 2. Open the Immediate window.
//
// Postconditions:
// 1. Compares the selected entities.
// 2. Examine the code and Immediate window.
//------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System;
using System.Diagnostics;
 
namespace Macro1CSharp.csproj
{
    partial class SolidWorksMacro
    {
        public void Main()
        {
 
            ModelDoc2 swModel = default(ModelDoc2);
            SelectionMgr swSelMgr = default(SelectionMgr);
            ModelDocExtension swModelDocExt = default(ModelDocExtension);
            object selObj1 = null;
            object selObj2 = null;
            object selObjPID1 = null;
            object selObjPID2 = null;
 
            swModel = (ModelDoc2)swApp.ActiveDoc;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            swModelDocExt = swModel.Extension;
 
            // Get the selected objects 
            selObj1 = swSelMgr.GetSelectedObject6(1, -1);
            selObj2 = swSelMgr.GetSelectedObject6(2, -1);
            Debug.Print("Compare the selected objects:");
            switch (swApp.IsSame(selObj1, selObj2))
            {
                case 0:
                    Debug.Print(" Selected objects are not the same.");
                    break;
                case 1:
                    Debug.Print(" Selected objects are the same.");
                    break;
                case -1:
                    Debug.Print(" Unable to determine if selected objects are the same.");
                    break;
            }
 
            Debug.Print("");
 
            Debug.Print("Compare the same objects:");
            switch (swApp.IsSame(selObj1, selObj1))
            {
                case 0:
                    Debug.Print(" Selected objects are not the same.");
                    break;
                case 1:
                    Debug.Print(" Selected objects are the same.");
                    break;
                case -1:
                    Debug.Print(" Unable to determine if selected objects are the same.");
                    break;
            }
 
            Debug.Print("");
 
            // Get the persistent reference IDs of the 
            // selected objects 
            selObjPID1 = swModelDocExt.GetPersistReference3(selObj1);
            selObjPID2 = swModelDocExt.GetPersistReference3(selObj2);
            Debug.Print("Compare the persistent reference IDs of the selected objects:");
            switch (swModelDocExt.IsSamePersistentID(selObjPID1, selObjPID2))
            {
                case 0:
                    Debug.Print(" Selected objects do not have the same persistent reference ID.");
                    break;
                case 1:
                    Debug.Print(" Selected objects do have the same persistent reference ID.");
                    break;
                case -1:
                    Debug.Print(" Unable to determine if the selected objects have the same persistent reference ID.");
                    break;
            }
 
            Debug.Print("");
 
            Debug.Print("Compare the persistent reference IDs of the same objects:");
            switch (swModelDocExt.IsSamePersistentID(selObjPID1, selObjPID1))
            {
                case 0:
                    Debug.Print(" Selected objects do not have the same persistent reference ID.");
                    break;
                case 1:
                    Debug.Print(" Selected objects do have the same persistent reference ID.");
                    break;
                case -1:
                    Debug.Print(" Unable to determine if the selected objects have the same persistent reference ID.");
                    break;
            }
        }
        public SldWorks swApp;
    }
}


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