Asp.Net api接口

using Entity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using Newtonsoft.Json;
using BLL;

namespace WebProject.Web.api
{
    /// <summary>
    /// Login 用户登录
    /// </summary>
    public class Login : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "application/json";
            UserInfoEntity entity = null;
            context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
            using (var reader = new StreamReader(context.Request.InputStream))
            {
                string postJson = reader.ReadToEnd();
                entity = (UserInfoEntity)JsonConvert.DeserializeObject(postJson, typeof(UserInfoEntity));
            }
            SetParameter parameter = new SetParameter();
            if (context.Request.RequestType.ToLower() == "post")
            {
                bool isSuccess = UserInfoBLL.getLogin(entity.Account, entity.Password);
                if (string.IsNullOrEmpty(entity.Account))
                {
                    parameter.state = 0;
                    parameter.msg = "请输入用户名";
                    string strAccount = JsonConvert.SerializeObject(parameter);
                    context.Response.Write(strAccount);
                    return;
                }
                if (string.IsNullOrEmpty(entity.Password))
                {
                    parameter.state = 0;
                    parameter.msg = "请输入密码";
                    string strPassword = JsonConvert.SerializeObject(parameter);
                    context.Response.Write(strPassword);
                    return;
                }
                parameter.Entity.account = entity.Account;
                parameter.Entity.password = entity.Password;
                if (parameter.Entity.password != entity.Password || parameter.Entity.account != entity.Account)
                {
                    parameter.state = 0;
                    parameter.msg = "用户名或密码错误";
                    string strJson = JsonConvert.SerializeObject(parameter);
                    context.Response.Write(strJson);
                    return;
                }
                parameter.state = 1;
                parameter.msg = "登录成功";
                string strSuccess = JsonConvert.SerializeObject(parameter);
                context.Response.Write(strSuccess);
            }
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
        public class SetParameter
        {
            public int state;
            public string msg;
            public ParameterEntity Entity = new ParameterEntity();
        }
        public class ParameterEntity
        {
            public string account { get; set; }
            public string password { get; set; }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Entity
{
    public class UserInfoEntity
    {
        private string account;

        public string Account
        {
            get { return account; }
            set { account = value; }
        }
        private string password;

        public string Password
        {
            get { return password; }
            set { password = value; }
        }
    }
}