2 Replies Latest reply on May 23, 2016 7:05 AM by Alone A.

    Error in Face selection code

    Alone A.

      Hi everyone

      I try the code available on solidworks API and try to convert it into C# but I am getting error as "NullReferenceException is unhandled"

      Can anyone help me to convert this VBA code to C#


      Original Code:


      Option Explicit

      Sub main()

          Dim swApp               As SldWorks.SldWorks

          Dim swModel             As SldWorks.ModelDoc2

          Dim swSelMgr            As SldWorks.SelectionMgr

          Dim swSelData           As SldWorks.SelectData

          Dim swPart              As SldWorks.PartDoc

          Dim swBody              As SldWorks.Body2

          Dim swFace              As SldWorks.Face

          Dim swEnt               As SldWorks.Entity

          Dim bRet                As Boolean

          Dim vBodies             As Variant


          Set swApp = CreateObject("SldWorks.Application")

          Set swModel = swApp.ActiveDoc

          Set swPart = swModel

          Set swSelMgr = swModel.SelectionManager

          Set swSelData = swSelMgr.CreateSelectData

          vBodies = swPart.GetBodies2(swAllBodies, True)

          Set swBody = vBodies(0)


          Set swFace = swBody.GetFirstFace

          swModel.ClearSelection2 True


          Do While Not swFace Is Nothing

              Set swEnt = swFace

              ' Select through Entity

              bRet = swEnt.Select4(True, swSelData): Debug.Assert bRet

              Set swFace = swFace.GetNextFace


      swModel.ClearSelection2 True

      End Sub



      My Code:


      Following code is followed by series of codes


                      Face2 swFace = null;

                      Body2 swBody = null;

                      //Face2 swFace = default(Face2);

                      //Body2 swBody = default(Body2);

                      Entity swEnt = default(Entity);

                      bool status = false;

                      SelectData swSelData = default(SelectData);              

                      swFace = (Face2)swBody.GetFirstFace();                              // ERROR at line  "NullReferenceException is unhandled"



                      while ((swFace != null))


                          swEnt = (Entity)swFace;               

                          // Select using IEntity

                          status = swEnt.Select4(true, swSelData);


                          swFace = (Face2)swFace.GetNextFace();





      Plz help me to remove this error. Is anything wrong with my code.