带有类值的下拉列表

本文关键字：下拉列表 | 更新日期: 2023-09-27 18:08:50

My class:

public class Transport
{
    public virtual int Id { get; set; }    
    public virtual Class.CarModel Modelis { get; set; }
}

和

 public class CarModel
 {
     public virtual int Id { get; set; }
     public virtual string model_name { get; set; } 
 }

控制器:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using NHibernate;
using NHibernate.Linq;
using web_nt.Models;
using System.Web.Mvc;
using Npgsql;
namespace web_nt.Controllers
{
    public class TransportController : Controller
    {
        public ActionResult Index()
        {            
            using (ISession session = NHIbernateSession.OpenSession())
            {
                //ICriteria.SetMaxResult();
                var index = session.Query<Transport>().ToList() ;
                return View(index);
            }
        }
    public ActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Create(Transport item)
    {
        try
        {
            using (ISession session = NHIbernateSession.OpenSession())
            {
                using (ITransaction transaction = session.BeginTransaction())
                {
                  //  item.owner = item.Vartotojas.Id;
                    //item.travel_type = item.Vartotojas.name;
                    session.Save(item);
                    transaction.Commit();
                }
            }
            return RedirectToAction("Index");
        }
        catch (Exception exception)
        {
            return View();
        }
    }
    public ActionResult Edit(int id)
    {
        using (ISession session = NHIbernateSession.OpenSession())
        {
            var item = session.Get<Transport>(id);
            return View(item);
        }
    }

    [HttpPost]
    public ActionResult Edit(int id, Transport item)
    {
        try
        {
            using (ISession session = NHIbernateSession.OpenSession())
            {
                var tabletoUpdate = session.Get<Transport>(id);
                tabletoUpdate.model = item.model;                    
                using (ITransaction transaction = session.BeginTransaction())
                {
                    session.Save(tabletoUpdate);
                    transaction.Commit();
                }
            }
            return RedirectToAction("Index");
        }
        catch
        {
            return View();
        }
    }

    public ActionResult Details(int id)
    {
        using (ISession session = NHIbernateSession.OpenSession())
        {
            var item = session.Get<Transport>(id);
            return View(item);
        }
    }
    public ActionResult Delete(int id)
    {
        using (ISession session = NHIbernateSession.OpenSession())
        {
            var item = session.Get<Transport>(id);
            return View(item);
        }
    }

    [HttpPost]
    public ActionResult Delete(int id, Transport item)
    {
        try
        {
            using (ISession session = NHIbernateSession.OpenSession())
            {
                using (ITransaction transaction = session.BeginTransaction())
                {
                    session.Delete(item);
                    transaction.Commit();
                }
            }
            return RedirectToAction("Index");
        }
        catch (Exception exception)
        {
            return View();
        }
    }
}

}

我想让DropDownListFor成为Modelis类。在Create View中发送值Id，显示值model_name。我该怎么做呢?控制器用户Nhibernate。Nhibernate是完成映射的地方。但基本上所有的功能和视图管理都在这里。

带有类值的下拉列表

您需要创建SelectListItem s:

public IEnumerable<SelectListItem> GetCarModels()
{
    var list = new List<SelectListItem>();
    foreach (var car in GET_CARS())
    {
        list.Add(new SelectListItem()
            {
                Value = car.Id.ToString(),
                Text = car.model_name
            });
    }
    return list;
}

作为第二个参数传递给DropDownListFor:

@Html.DropDownListFor(m => m.Modelis, LIST_FROM_ABOVE)

更短的版本可能是:

public SelectList GetCarModels()
{
    return new SelectList(GET_CARS(), "Id", "model_name")
}

和View:

@Html.DropDownListFor(m => m.Modelis, CarModels)
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