Question

我正在尝试在我的视图中填充下拉列表，但我不知道正确的lambda表达式是否正常工作。请参阅以下代码：

@model Website.Models.modelTeamSelect


<h2>MatchSelect.cshtml</h2>

@using (Ajax.BeginForm("_PartialTeams",
    new
    {
        model = this.Model
    },
    new AjaxOptions
    {
        HttpMethod = "POST",
        UpdateTargetId = "divMatchScheduler",
        InsertionMode = InsertionMode.Replace
    }))
{

    <div id="divMatchScheduler">
         @Html.LabelFor(m => m.modelMatch.HomeTeam)
         @Html.DropDownListFor(m => m.modelMatch.HomeTeam, new SelectList
    {
      Items = Model.teams.Select(t => t.TeamName)  
    })
         @Html.LabelFor(m => m.modelMatch.AwayTeam)

         @Html.LabelFor(m => m.modelMatch.MatchDate)
         @Html.TextBoxFor(m => m.modelMatch.MatchDate)
    </div>

     <input type="submit" value="Add Match" name="btnSubmit" />


}

此语法错误

@Html.DropDownListFor(m => m.modelMatch.HomeTeam, new SelectList
    {
      Items = Model.teams.Select(t => t.TeamName)  
    })

我的模型由视图及其包含的集合使用

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

namespace Website.Models
{
    public class modelMatch
    {
       public Guid MatchID { get; set; }

       public Guid AwayTeamID { get; set; }
       public string AwayTeam { get; set; }

       public Guid HomeTeamID { get; set; }
       public string HomeTeam { get; set; }

       public DateTime MatchDate { get; set; }
    }
}

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

namespace Website.Models
{
    public class modelTeamSelect
    {
        public modelTeamSelect()
        {
            teams = new List<modelTeam>();
            team = new modelTeam();
            modelMatch = new Models.modelMatch();
            modelMatches = new List<modelMatch>();
        }

        public List<modelTeam> teams { get; set; }
        public modelTeam team { get; set; }
        public modelMatch modelMatch { get; set; }
        public List<modelMatch> modelMatches { get; set; }

        public string message { get; set; }
    }
}

摘要

如何使用我模型中的列表集合填充dropdownlist？

Answer 1

对于大多数情况，您需要使用SelectList @Html.DropDownListFor(m => m.modelMatch.HomeTeam, new SelectList(Model.teams, "dataValueField", "dataTextField"))来填充下拉列表。

dataValueField

dataTextField和modelTeam是{{1}}模型中的属性，将用作下拉列表的值和文本。

Answer 2

@{
    <br />
    ViewBag.TeamList = Model.teams.Select(t => t.TeamName);
    <br />
}   

<br />

@Html.DropDownListFor(m => m.modelMatch.HomeTeam, ViewBag.TeamList as SelectList)

Answer 3

您还可以创建HtmlHelperExtensions类来绑定下拉列表。

public static IEnumerable<SelectListItem> ObtenerPais(this HtmlHelper helper)
        {
            var cnx = new dbLenorExampleEntities();

            var resultado = cnx.PAIS.ToList()
                .Select(e => new SelectListItem
                {
                    Text = e.NOMBRE,
                    Value = Convert.ToString(e.ID_PAIS)
                }).ToList();

            //if (Default)
            resultado.Insert(0, new SelectListItem
            {
                Text = "-- Seleccionar --",
                Value = ""
            });

            return resultado;
        }

使用它：

@Html.DropDownListFor(model => model.ID_ENTIDAD, Html.ObtenerPais(Default: true))

希望这有帮助

MVC 4 - 使用模型列表填充下拉列表

3 个答案: