在 ASP.NET MVC 中引用 JSON 的命名空间

Question

我正在尝试为我的 repository.cs 使用 json，但它一直给我错误“在当前上下文中不存在”。我想我缺少一个名称空间，但我不确定要使用哪个名称空间。我曾尝试使用命名空间“using system.web.mvc”，但它只纠正了“JsonRequestBehavior”，并在“Json”上显示“当前上下文中不存在”的错误消息

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using Dapper;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;
using Mis324Assignments.Models;

namespace Mis324Assignments.DataRepository
{
    public class BirdRepository
    {
        private SqlConnection connection;

        //Constructor to handle connection    
        public BirdRepository()
        {
            string connectString = ConfigurationManager.ConnectionStrings["Birds"].ToString();
            connection = new SqlConnection(connectString);
        }

        //To view all person details using generic list       
        public List<BirdModel> GetRandom()
        {
            using (IDbConnection db = connection)
            {
                string sql = "SELECT TOP 4 Id, Name, ImageName, Description FROM BirdDetails ORDER BY newid()";
                List<BirdModel> birds = db.Query<BirdModel>(sql).ToList();
                return birds;
            }
        }

        //Get one person by id (for update & details)
        public BirdModel GetOneBird(int id)
        {
            using (IDbConnection db = connection)
            {
                string sql = "select Id, Name, ImageName, Description FROM BirdDetails where id = @Id";
                //need to parameterize ID to avoid sql injection attacks.
                BirdModel bird = db.Query<BirdModel>(sql, new { id }).SingleOrDefault();
                return bird;
            }
        }

        public List<ColorModel> GetColors()
        {
            using (IDbConnection db = connection)
            {
                string sql = "SELECT ColorID, Name FROM Colors ORDER BY Name";
                List<ColorModel> colors = db.Query<ColorModel>(sql).ToList();
                return colors;
            }
        }

        public List<BirdModel> GetByColor(string colorID)
        {
            using (IDbConnection db = connection)
            {
                string sql = "select d.Id, d.Name, d.ImageName " 
                            +" from BirdDetails d, birdColors c " +" where d.Id = c.Id " 
                            +" and c.ColorID = @colorID " 
                            +" order by d.Name";
                List<BirdModel> birds = db.Query<BirdModel>(sql, new { colorID }).ToList();
                return birds;  

            }
        }

        public List<BirdModel> SearchName(string id)
        {
            using (IDbConnection db = connection)
            {
                string wildcard = '%' + id + '%';
                string sql = "select Id, Name, ImageName from BirdDetails where Name like @wildcard";
                List<BirdModel> birds = db.Query<BirdModel>(sql, new { wildcard }).ToList();
                return Json(birdRep.SearchName(id), JsonRequestBehavior.AllowGet);
            }
        }
    }
}

Answer 1

System.Web.Helpers 是您要查找的命名空间。

编辑：您需要从继承自 System.Web.Mvc.Controller 的类中调用该方法

Answer 2

您是否尝试过使用 Json.net？请参阅上一个问题的答案：

https://stackoverflow.com/a/31535517/6262021

编辑：跟进 DmiHawk 的回答：

   public class User: Controller {

}