Tecnomatix PDPS 开发 显示所选物体类型

以下为相关代码，PDPS开发入门必备：
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    public class testSelectionType:TxButtonCommand
    {
        private string messageFormat = ".Net API type={0}";

        public testSelectionType() { }
        public override string Category
        {
            get { throw new NotImplementedException(); }
        }

        public override void Execute(object cmdParams)
        {
            getTypeLarge();
        }



        private void getTypeLarge()
        {
            TxObjectList selectedObjects = TxApplication.ActiveSelection.GetItems();//[0] as ITxObject;
            if (selectedObjects.Count > 0)
            {
                ITxObject selectedObject = selectedObjects[0];
                TxMessageBox.Show(string.Format(messageFormat, selectedObject.GetType().ToString()), Name, MessageBoxButtons.OK, MessageBoxIcon.Information);

                if (selectedObject is ITxGroup)
                {
                    TxGroup group = selectedObject as TxGroup;
                    TxObjectList list = group.GetDirectDescendants(new TxNoTypeFilter());
                    foreach(ITxObject objectInList in list)
                    {
                        MessageBox.Show(objectInList.Name);
                    }
                }



                var externalId = "external-id-of-the-object";
                var txObject = TxApplication.ActiveDocument.GetObjectByProcessModelId(new TxProcessModelId(externalId)) as Tecnomatix.Planning.ITxPlanningObject;
                var prototypeObject = txObject.GetField("prototype") as Tecnomatix.Planning.ITxPlanningObject;
                var planningType = prototypeObject.PlanningType;
                //string planningType = planningObject.PlanningType;
                TxMessageBox.Show(string.Format(messageFormat, planningType.ToString()), Name, MessageBoxButtons.OK, MessageBoxIcon.Information);

            }
        }

        public override string Name
        {
            get { return StringTable1.Name_Type; }
        }


    }