NXOpen弹出选择对话框函数

　　   /// <summary>
        /// 选择面对话框
        /// </summary>
        /// <param name="selected_face">返回被选中面</param>
        public void SelectFace(out Face selected_face)
        {
            try
            {
                UI theUI = UI.GetUI();
                NXObject obj;
                string message = "请选择面";
                string title = "请选择面";
                Selection.SelectionScope scope = Selection.SelectionScope.WorkPart;
                bool keepHighlighted = false;
                Selection.SelectionType[] typeArray = new Selection.SelectionType[1] { Selection.SelectionType.Faces };
                Point3d cursor;
                theUI.SelectionManager.SelectObject(message, title, scope, keepHighlighted, typeArray, out obj, out cursor);
                selected_face = (Face)obj;
            }
            catch
            {
                selected_face = null;
            }
        }