小编Rai*_*ght的帖子

这是我的模型:

public class NewsCategoriesModel {
    public int NewsCategoriesID { get; set; }        
    public string NewsCategoriesName { get; set; }
}

我的控制器:

public ActionResult NewsEdit(int ID, dms_New dsn) {
    dsn = (from a in dc.dms_News where a.NewsID == ID select a).FirstOrDefault();
    var categories = (from b in dc.dms_NewsCategories select b).ToList();
    var selectedValue = dsn.NewsCategoriesID;
    SelectList ListCategories = new SelectList(categories, "NewsCategoriesID", "NewsCategoriesName",selectedValue);

    // ViewBag.NewsCategoriesID = new SelectList(categories as IEnumerable<dms_NewsCategory>, "NewsCategoriesID", "NewsCategoriesName", dsn.NewsCategoriesID);
    ViewBag.NewsCategoriesID = ListCategories;
    return View(dsn);
}

然后我的看法:

@Html.DropDownList("NewsCategoriesID", (SelectList)ViewBag.NewsCategoriesID)

当我运行时, …

我想通过布局和我的方式显示所有页面的类别:这里我的模型(NewsCategoriesModel)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Security;


namespace GiaoXuKeSat.Models
{
    public class NewsCategoriesModel
    {
        public int NewsCategoriesID { get; set; }
        public string NewsCategoriesName { get; set; }
    }
}

这里是Partialview(_NewsCategories)

@using System.Linq;


@using System.Linq;
@model IEnumerable<GiaoXuKeSat.Models.dms_NewsCategory>

@foreach (var item in Model) {
  <ul id="dmsMenuULUL">
     <li>@item.NewsCategoriesName</li>
</ul>     
}

然后我将部分视图打印到布局

@Html.Partial("_NewsCategories");

但是我没有将Object引用设置为对象的实例.在

@foreach (var item in Model) {