asp.net朱勇项目个人博客(3)

引文:按照书上的项目，我们最后实现管理端的三个增删改查的功能即可,相对与三个增删改查，文章，分类和留言，这里我们所需要用的的关联的一个表就是文章表，因为文章表每一个文章的增加显示和修改都需要对应的一个分类，也就是这三个增删改查稍微复杂的一个点.
 

第一部分:

我们首先来实现文章的增删改查功能:

首先我们添加控制器，按照我的步骤添加如下的控制器。

在控制部分需要修改的代码就是这个一个，我们需要有一个分页的实现，然后还要有一个关于Category的一个Id关联，

然后在创建和编辑的时候我们也需要对代码进行一下关联的修改 

这是控制器代码: 

  private Model2 db = new Model2();

        // GET: admin/Articles
        public ActionResult Index(int? page)
        {
            int pageIndex = page ?? 1;
            int pageSize = 2; 

            var orderedArticles = db.Articles.OrderBy(a => a.Id).Include(a=>a.Category); // 假设按 Id 升序排序

            IPagedList<Article> p1 = orderedArticles.ToPagedList(pageIndex, pageSize);


            return View(p1);
        }

        // GET: admin/Articles/Details/5
        public ActionResult Details(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Article article = db.Articles.Find(id);
            if (article == null)
            {
                return HttpNotFound();
            }
            
            return View(article);
        }

        // GET: admin/Articles/Create
        public ActionResult Create()
        {
            ViewBag.Category_Id = new SelectList(db.Categories,"Id","Name");
            return View();
        }

        
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create([Bind(Include = "Id,Title,Content,CategoryName,addDate,Hit,Category_Id")] Article article)
        {
            if (ModelState.IsValid)
            {
                article.addDate= DateTime.Now;
                db.Articles.Add(article);
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            ViewBag.Category_Id = new SelectList(db.Categories, "Id", "Name",article.Category_Id);

            return View(article);
        }

        // GET: admin/Articles/Edit/5
        public ActionResult Edit(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Article article = db.Articles.Find(id);

            if (article == null)
            {
                return HttpNotFound();
            }
            ViewBag.Category_Id = new SelectList(db.Categories, "Id", "Name", article.Category_Id);
            return View(article);
        }

        // POST: admin/Articles/Edit/5
        // 为了防止“过多发布”攻击，请启用要绑定到的特定属性；有关
        // 更多详细信息，请参阅 https://go.microsoft.com/fwlink/?LinkId=317598。
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit([Bind(Include = "Id,Title,Content,CategoryName,addDate,Hit,Category_Id")] Article article)
        {
            if (ModelState.IsValid)
            {
                article.addDate = DateTime.Now;

                db.Entry(article).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            ViewBag.Category_Id = new SelectList(db.Categories, "Id", "Name", article.Category_Id);
            return View(article);
        }

        // GET: admin/Articles/Delete/5
        public ActionResult Delete(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Article article = db.Articles.Find(id);
            if (article == null)
            {
                return HttpNotFound();
            }
            return View(article);
        }

        // POST: admin/Articles/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public ActionResult DeleteConfirmed(int id)
        {
            Article article = db.Articles.Find(id);
            db.Articles.Remove(article);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                db.Dispose();
            }
            base.Dispose(disposing);
        }
    }

 然后这个是列表显示页的视图代码

<p class="p">
    @Html.ActionLink("创建文章", "Create")
</p>
<table class="table">
    <tr>
        <th>
            @*@Html.DisplayNameFor(model => model.Title)*@
            标题
        </th>
        <th>
            @* @Html.DisplayNameFor(model => model.Content)*@
            内容
        </th>
        <th>
            @*@Html.DisplayNameFor(model => model.addDate)*@
            添加日期
        </th>
        <th>
            @* @Html.DisplayNameFor(model => model.Hit)*@
            浏览量
        </th>
        <th>
            @* @Html.DisplayNameFor(model => model.Category_Id)*@
            分类
        </th>
        <th></th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Title)
            </td>
            <td class="content-width">
                @Html.DisplayFor(modelItem => item.Content)
            </td>

            <td>
                @Html.DisplayFor(modelItem => item.addDate)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Hit)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Category.Name)
            </td>
            <td>
                @Html.ActionLink("编辑", "Edit", new { id = item.Id }) |
                @Html.ActionLink("详情", "Details", new { id = item.Id }) |
                @Html.ActionLink("删除", "Delete", new { id = item.Id })
            </td>
        </tr>

    }

</table>
<div class="pager">
    @Html.PagedListPager(Model, page => Url.Action("Index", new { page }),
       PagedListRenderOptions.ClassicPlusFirstAndLast)
</div>

这个是创建页的控制器代码 

<h2>新建文章</h2>

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
       
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.Label("文章标题", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Title, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.Label("文章内容", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.TextAreaFor(model => model.Content, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Content, "", new { @class = "text-danger" })
            </div>
        </div>


        <div class="form-group">
            @Html.Label("分类", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("Category_Id", String.Empty)
                @Html.ValidationMessageFor(model => model.Category_Id, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="保存" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("返回列表", "Index")
</div>

这是编辑页的控制器代码:
 

<h2>文章编辑</h2>

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">


    <div class="form-group">
        @Html.Label("标题", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Title, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.Label("文章内容", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.TextAreaFor(model => model.Content, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Content, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.Label("分类", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownList("Category_Id", String.Empty)
            @Html.ValidationMessageFor(model => model.Category_Id, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="保存" class="btn btn-default" />
        </div>
    </div>
</div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

然后剩下的两个增删改查就不需要做过多的操作，只需要按视图模型生成即可