public void StringEncodeNoFlag()
        {
            var msg = new DefaultMessage
            {
                Sequence = 1,
                Payload  = "Open".GetBytes(),
            };
            var str = msg.Encode(null, false);

            Assert.Equal("4,1:Open", str);

            var msg2 = new DefaultMessage
            {
                Reply    = true,
                Sequence = 1,
                Payload  = "执行成功".GetBytes(),
            };
            var str2 = msg2.Encode(null, false);

            Assert.Equal("12,1:执行成功", str2);
        }