前台post通过web api向数据库中添加数据

这是后台代码，利用ORM 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using NPoco;
namespace WebApi4._0练习.Models
{
    [TableName("webApiTest")]
    [PrimaryKey("Id")]
    public class UserModels
    {
        //属性
        public string ModeKey { get; set; }

        public string ModeValue { get; set; }
    }
}

 public ApiResult PostAdd([FromBody] UserModels user)
        {
            try
            {
                using( IDatabase db = new Database("connStringName"))
                {
                  //UserModels u = new UserModels()
                  //{
                  // ModeKey = "[email protected]",
                  // ModeValue = "j"
                  //};
                 //var ModeKey=Request.Form["ModeKey"];
               db.Insert(user);
               }
            }
           catch(Exception ex)
            {
                //Console.WriteLine(ex.Message);
            }
            finally
            {
                
            }

            return new ApiResult { IsSucceed = true, ReturnValue = "1" };
        }


 
        

            ModeKey  :
              
            


            ModeValue: