C#windows服务 弹出一个ui窗体程序无法获取管理员权限

我现在有window服务运行中弹出ui窗体程序的需求，网上来找了代码，运行之后虽然能弹出ui窗体，但是因为没有管理员模式，无法启动端口监听，明明我服务创建的是系统管理员
代码如下

try
            {
                string appStartPath = runCommand;
                IntPtr userTokenHandle = IntPtr.Zero;
                ApiDefinitions.WTSQueryUserToken(ApiDefinitions.WTSGetActiveConsoleSessionId(), ref userTokenHandle);

                ApiDefinitions.PROCESS_INFORMATION procInfo = new ApiDefinitions.PROCESS_INFORMATION();
                ApiDefinitions.STARTUPINFO startInfo = new ApiDefinitions.STARTUPINFO();
                startInfo.cb = (uint)Marshal.SizeOf(startInfo);

                ApiDefinitions.CreateProcessAsUser(
                    userTokenHandle,
                    appStartPath,
                    "",
                    IntPtr.Zero,
                    IntPtr.Zero,
                    false,
                    0,
                    IntPtr.Zero,
                    null,
                    ref startInfo,
                    out procInfo);

                if (userTokenHandle != IntPtr.Zero)
                    ApiDefinitions.CloseHandle(userTokenHandle);

                int _currentAquariusProcessId = (int)procInfo.dwProcessId;
                currentAquariusProcessId = _currentAquariusProcessId;
                error = "";
                return true;
            }
            catch (Exception e)
            {
                error = e.Message;
            }
            return false;