//https://blog.csdn.net/qq_21489689/article/details/78973787

 [System.Security.SuppressUnmanagedCodeSecurity]

        [DllImport("accore.dll", EntryPoint = "acedPutSym",

            CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]

        extern static private int acedPutSym(string args, IntPtr result);

        /// <summary>

        /// Set a LISP variable value.

        /// </summary>

        /// <param name="name">The variable name.</param>

        /// <param name="rb">The variable value</param>

        public static void SetLispSym(string name, ResultBuffer rb)

        {

            acedPutSym(name, rb.UnmanagedObject);

        }

        [System.Security.SuppressUnmanagedCodeSecurity]

        [DllImport("accore.dll", EntryPoint = "acedGetSym",

            CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]

        extern static private int acedGetSym(string args, out IntPtr result);

        /// <summary>

        /// Get a LISP variable value.

        /// </summary>

        /// <param name="name">The variable name.</param>

        /// <returns>The variable value or null if failed.</returns>

        public static ResultBuffer GetLispSym(string name)

        {

            IntPtr ip = IntPtr.Zero;

            int status = acedGetSym(name, out ip);

            if (status == (int)PromptStatus.OK && ip != IntPtr.Zero)

            {

                return ResultBuffer.Create(ip, true);

            }

            return null;

        }

        //当然，要读取这个变量，首先要设置或者加载这个变量

        ResultBuffer rb1114c = GetLispSym("dydj");

        float intRetio=;

     foreach (TypedValue val in (System.Collections.IEnumerable)rb1114c)

     {

          intRetio = (float)Convert.ToDouble((val.Value.ToString()));//根据你设置的类型进行转换

     }