using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using NXOpen;

using NXOpen.Utilities;

using NXOpen.UF;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            Session theSession = Session.GetSession();

            UFSession theUfSession = UFSession.GetUFSession();

            UFUi theUFUi = theUfSession.Ui;

            string path = @"D:\test model\_asm1.prt";

            NXOpen.Tag obj = NXOpen.Tag.Null;

            UFPart.LoadStatus LoadStatus;

            theUfSession.Part.Open(path, out obj, out LoadStatus);

            NXOpen.Part part = theSession.Parts.Display;

            try

            {

                foreach (Expression p in part.Expressions)

                {

                    if ("a" == p.Name)

                    {

                        p.RightHandSide = "4";

                        //part.Expressions.Edit(p, "ab*cd*ef+5");

                        p.EditComment("测试");

                    }

                }

                //Expression exp = part.Expressions.Create("a=1");

            }

            catch(Exception ex)

            {

                Console.WriteLine(ex.Message);

            }

            theUfSession.Part.Save();

            theUfSession.Part.CloseAll();

        }

    }

}