看此代码求解释！

Question

 public class login : IHttpHandler    {        public void ProcessRequest(HttpContext context)        {            //验证用户名密码            string loginName = context.Request.Form["loginName"];            base64 b6 = new base64();            string password = b6.decodeBase64(context.Request.Form["password"]);             loginReturn lr = new loginReturn();             int userId = SSO.Operate.ValidateUserInfo(loginName, password);            if (userId > 0)            {                SSORequest ssorequest = new SSORequest();                //获取用户Model，并将相应的值赋给SSORequest                if (Authentication.CreateAppToken(ssorequest))                {                    lr.userId = userId;                    lr.AA_Token = ssorequest.AA_Token;                    context.Response.Write(JsonHelper.JsonSerializer(lr));                }            }            lr.userId = -1;            lr.AA_Token = "";            context.Response.Write(JsonHelper.JsonSerializer(lr));        }         public bool IsReusable        {            get            {                return false;            }        }    }}

Answer 1

你哪些地方看不懂？