JsonRequestBehavior.AllowGet 在当前上下文中不存在

Question

我正在使用 asp.net MVC 核心，我将在 kendo 下拉列表中从 SQL 读取数据。 我也安装了 Newtonsoft.Json 库。我看到下拉列表，但无法在下拉列表中加载数据。我的代码如下：

我的模型位于models>Airports.cs:

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

namespace plan_1.Models
{
public class Airport: BaseEntity  
   { 
    public int Id { get; set; }
    public string Iata { get; set; }
    public string Icao { get; set; }
    public string LogoUrl { get; set; }
    public int IsBased { get; set; }
    public int CityId { get; set; }
    public virtual City City { get; set; }

    public Airport()
    {
        this.Terminals = new 
          HashSet<Terminal>();
    }
     public ICollection<Terminal> Terminals 
     { get; set; }
   }
}

我的控制器位于 Controllers>planController.cs ：

using System.Linq;
using Microsoft.AspNetCore.Mvc;
using plan_1.Models;
using Newtonsoft.Json;
namespace plan_1.Controllers
{
 public class planController : Controller
 {        
    public ActionResult Index()
    {
        return View();
    }
    public JsonResult GetAirPort()
    {
      plan_1Context dbContext = new 
      plan_1Context();

        return 
        Json(dbContext.AirPorts.Select(O => 
        new { _Id = O.Id, Origin = O.Iata 
        }), 
     JsonRequestBehavior.AllowGet);
    }
  }
}

我在views>plan>index.cshtml中的视图如下：

@model IEnumerable<plan_1.Models.Airport>
@{
 ViewData["Title"] = "Planing";
 }

 <div>

    <h4>Origin:</h4>


    @(Html.Kendo().DropDownList()
                .Name("Origin")
                .HtmlAttributes(new { style 
    = "width:100%" })
                .OptionLabel("Select 
     category...")
                .DataTextField("Iata")
                .DataValueField("Id")
                .DataSource(source =>
                {
                    source.Read(read =>
                    {                  
read.Action("GetAirPorts", 
       "planController");
                    });
                })

    )
</div>


also, I should mix the airplane model by 
the plan model, I think I should use the 
view model to mix them.

Please help what should I do? It is days 
that I am looking for the answer

Answer 1

            .DataTextField("Iata")
            .DataValueField("Id")

是您在下拉列表中定义的 id 和值，但是您从控制器传回 _Id 和 Origin。我建议更改其中任何一个以匹配，以便它可以绑定到模型。我还建议在您的下拉列表中添加.AutoBind(true)。