Navisworks二次开发——属性增加

 ModelItemCollection oMC_NET = Autodesk.Navisworks.Api.Application.ActiveDocument.CurrentSelection.SelectedItems;
            ComApi.InwOpState10 oState = ComApiBridge.State;
            if (oMC_NET.Count > 0)
            {
                ComApi.InwOpSelection comSelectionOut =
                ComApiBridge.ToInwOpSelection(oMC_NET);
                ComApi.InwSelectionPathsColl oPaths = comSelectionOut.Paths();
                ComApi.InwOaPath3 oPath = (ComApi.InwOaPath3)oPaths.Last();
                ComApi.InwGUIPropertyNode2 propn =
                  (ComApi.InwGUIPropertyNode2)oState.GetGUIPropertyNode(oPath, true);
                ComApi.InwOaPropertyVec newPvec =
                  (ComApi.InwOaPropertyVec)oState.ObjectFactory(
                ComApi.nwEObjectType.eObjectType_nwOaPropertyVec, null, null);
                ComApi.InwOaProperty erectionDatesP = (ComApi.InwOaProperty)oState.ObjectFactory(
                ComApi.nwEObjectType.eObjectType_nwOaProperty, null, null);
                erectionDatesP.name = "Erection Date";
                erectionDatesP.UserName = "Erection Date_UserName";
                erectionDatesP.value = "na";
                newPvec.Properties().Add(erectionDatesP);
                ComApi.InwOaProperty bolttorqueDatesP = (ComApi.InwOaProperty)oState.ObjectFactory(
                ComApi.nwEObjectType.eObjectType_nwOaProperty, null, null);
                bolttorqueDatesP.name = "Bolt Torque Date";
                bolttorqueDatesP.UserName = "Bolt Torque Date_UserName";
                bolttorqueDatesP.value = "na";
                newPvec.Properties().Add(bolttorqueDatesP);
                ComApi.InwOaProperty inspectionDatesP = (ComApi.InwOaProperty)oState.ObjectFactory(
                ComApi.nwEObjectType.eObjectType_nwOaProperty, null, null);
                inspectionDatesP.name = "Inspection Date";
                inspectionDatesP.UserName = "Inspection Date_UserName";
                inspectionDatesP.value = "na";
                newPvec.Properties().Add(inspectionDatesP);
                propn.SetUserDefined(0, "Construction Dates",
                     "Construction Dates_InteralName", newPvec);

            }