I'm using the ModelDoc2.SelectionManager to obtain the currently selected component in an assembly. With that I get the ModelDoc2 of the selected component, then the ModelDocExtension, and finally the CustomPropertyManager from that. I use the CustomPropertyManager to query some of the custom properties and then use it to add a new one. The properties I query are all correct for the selected part so I know I am working with the correct component. I use the CustomPropertyManager's Add2 function to add a new property and it returns a 1 implying it was added successfully. If I click the More Properties button to view the component's custom properties, I see my newly added property in the list. From the File Menu I select Save All & then close the assembly. I immediately open the same assembly back up, select the same component, view its custom properties, and the new property I just added is no longer listed!

Anyone have any ideas what the problem is?

Thanks!

Below is the code I'm calling. I use the same code for dealing with both Part files and Assemblies. It works fine for Part files (AsmMode=false), but behaves as described above for Assemblies. In this case my parameters have the following values: CustPropName="TEST_PROPERTY", CustPropVal="true", AsmMode=true, swMdlDoc=null

static public bool SetCustomProperty(string CustPropName, string CustPropVal, bool AsmMode = false, ModelDoc2 swMdlDoc = null)

{

    try

    {

          if (swMdlDoc == null)

          {

              swMdlDoc = (ModelDoc2)iSwApp.ActiveDoc;

          }

          CustomPropertyManager swPropMgr;

          if (AsmMode)

          {

              // Need to obtain the active feature's ModelDoc SelectionManager

              SelectionMgr swSelMgr = (SelectionMgr)swMdlDoc.SelectionManager;

              int cnt = swSelMgr.GetSelectedObjectCount2(-1);

              if (cnt > 1)

              {

                    MessageBox.Show("Please ensure that only the object you are attempting to set Custom Property data for is currently selected.",

                                        "Multiple Objects Selected", MessageBoxButtons.OK, MessageBoxIcon.Information);

                    return false;

              }

              if (cnt == 0)

              {

                    ModelDocExtension swMdlExt = swMdlDoc.Extension;

                    swPropMgr = (CustomPropertyManager)swMdlExt.CustomPropertyManager[""];

              }

              else

              {

                    Component2 swSelComp = (Component2)swSelMgr.GetSelectedObjectsComponent3(1, -1);

                    ModelDoc2 swSelMdlDoc = (ModelDoc2)swSelComp.GetModelDoc2();

                    ModelDocExtension swSelMdlExt = swSelMdlDoc.Extension;

                    swPropMgr = (CustomPropertyManager)swSelMdlExt.CustomPropertyManager[""];

              }

          }

          else

          {

              ModelDocExtension swMdlExt = swMdlDoc.Extension;

              swPropMgr = (CustomPropertyManager)swMdlExt.CustomPropertyManager[""];

          }

          bool PropertyExists = false;

          int WasAdded = 0;

          object[] nms = (object[])swPropMgr.GetNames();

          foreach(string nm in nms)

          {

              if (string.Compare(nm, CustPropName, true) == 0)

              {

                    PropertyExists = true;

                    break;

              }

          }

          DocumentEventHandler.In_BK_ITEM_DESC_Reset = true;

          if (PropertyExists)

          {

              swPropMgr.Set(CustPropName, CustPropVal);

          }

          else

          {

              WasAdded = swPropMgr.Add2(CustPropName, (int)swCustomInfoType_e.swCustomInfoText, CustPropVal);

          }

          DocumentEventHandler.In_BK_ITEM_DESC_Reset = false;

          return WasAdded == 0 ? false : true;

    }

    catch(Exception)

    {

          return false;

    }

}