MVC 4 - 與型號列表填充下拉列表

Question

我想在我的視圖中填充dropdownlistfor，我不知道它正確的lambda表達式的工作。請參見下面的代碼：

@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" /> 


} 

這個語法錯誤

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

我的模型正在使用的視圖和收集它包含

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

如何使用我的模型中的列表集合來填充dropdownlist？

Answer 1

對於大多數情況下，您會希望使用this overload的SelectList填充下拉菜單。

@Html.DropDownListFor(m => m.modelMatch.HomeTeam, new SelectList(Model.teams, "dataValueField", "dataTextField")) 

dataValueField和dataTextField是從你modelTeam模型將被用作值和文本的下拉菜單中的屬性。

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

您還可以創建HtmlHelperExtensions類來綁定下拉列表。

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; 
     } 

及使用它：

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

希望這有助於