【基础】一个简单的MVC实例及故障排除

Controller:

 public ActionResult Index()
        {
            string setting = "ApplicationServices";
            var connString = System.Web.Configuration.WebConfigurationManager.ConnectionStrings[setting];
            SqlConnection conn = new SqlConnection(connString.ConnectionString);
            SqlCommand cmd;
            SqlDataReader datar;
            string str_sql = "select * from T_category;";
            conn.Open();
            cmd = new SqlCommand(str_sql, conn);
            datar = cmd.ExecuteReader();
            List<string> list_categoery = new List<string>();
            while (datar.Read())
            {
                list_categoery.Add(datar["category_name"].ToString());
            }
            conn.Close();
            ViewBag.Categories = list_categoery;

            str_sql = "select * from T_product;";
            conn.Open();
            cmd = new SqlCommand(str_sql, conn);
            datar = cmd.ExecuteReader();
            productModel pm = new productModel();
            while (datar.Read())
            {
                pm.product_name = datar["Product_name"].ToString();
                pm.product_description = datar["Product_description"].ToString();
                pm.product_image = datar["Product_image"].ToString();
                pm.product_document = datar["Product_document"].ToString();
            }
            conn.Close();
            return View(pm);
        }

View:

@model MvcApplication2.Models.productModel


@{
    Layout = null;
}

<div id="categories">
                    <ul>
                        @foreach (var cate in (ViewBag.Categories) as IEnumerable<string>)
                            {
                                <li>@cate</li>
                            }
                    </ul>
                </div>

 <section id="isBIM_models">
                <div>
                    <div id="Section_one">
                        <div id="One_product">
                            <div id="product_image">
                                <img src="~/image/isBIM_product/@(Model.product_image).jpg"/>
                            </div>
                            <div id="product_description">
                                <p>简介：<br />@Model.product_description</p>
                            </div>
                            <div class="clearfix"></div>
                            <div id="product_source">
                               <a href="~/DLL/@(Model.product_name)_DLL_2015.dll">下载</a>
                                <input type="button" id="downloadbutton"/>
                               @*<a href="~/Home/download">Click to get file</a>*@
                                
                            </div>
                        </div>
                    </div>
                </div>
            </section>

 （view中只列出了绑定模型字段的部分）

Model:

 public class productModel
    {
        public productModel() { }
        public int product_id { get; set; }
        public string product_name { get; set; }
        public string product_description { get; set; }
        public string product_image { get; set; }
        public string product_document { get; set; }

    }

如果运行时遇到这样的报错：Microsoft.CSharp.RuntimeBinder.RuntimeBinderException

则在Assemblyinfo.cs中添加一句：

[assembly: InternalsVisibleTo("MvcApplication2.Controllers")]