MVC學習第一章

由於自己也是才學習Web開發，可能寫的東西比較簡單，有興趣的可以看，大牛跟大蝦可以幫忙指出問題，可能裏面專業術語不會太多，畢竟自己也不懂，還請見諒。

1、直接打開VS2010，創建一個新的MVC框架應用程序。

2、創建完成後，系統基本會將基礎工作都做完了，自動生成文件，目錄如下：

3、創建數據模型，在Models文件夾處，右擊添加“新建項”，設置實體數據模型名稱爲“NorthWind.edmx”，按照提示一步一步往下，此處我只用一張表來做例子“Categories”。

4、更改控制器，添加Create、Edit、Detail幾個方法。

namespace MvcApplication1.Controllers
{
        [HandleError]
        public class HomeController : Controller
        {
                NorthwindEntities northWind = new NorthwindEntities();

                public ActionResult Index()
                {
                        var models = northWind.Categories.ToList();

                        return View(models);
                }

                [AcceptVerbs(HttpVerbs.Get)]
                public ActionResult Edit(int id)
                {
                        var models = northWind.Categories.First(c => c.CategoryID == id);
                        return View(models);
                }

                [AcceptVerbs(HttpVerbs.Post)]
                public ActionResult Edit(int categoryId, FormCollection form)
                {
                        var models = northWind.Categories.First(c => c.CategoryID == categoryId);
                        UpdateModel(models, new[] { "CategoryName", "Description" });
                        northWind.SaveChanges();

                        return RedirectToAction("Index");
                }

                [AcceptVerbs(HttpVerbs.Get)]
                public ActionResult Detail(int id)
                {
                        var models = northWind.Categories.First(c => c.CategoryID == id);
                        return View(models);
                }

                [AcceptVerbs(HttpVerbs.Get)]
                public ActionResult Create()
                {
                        Categories category = new Categories();
                        return View(category);
                }

                [AcceptVerbs(HttpVerbs.Post)]
                public ActionResult Create(int categoryId, FormCollection form)
                {
                        var models = northWind.Categories.FirstOrDefault(c => c.CategoryID == categoryId);

                        if (models==null)
                        {
                                Categories category = new Categories();
                                UpdateModel(category, new[] { "CategoryName", "Description" });
                                northWind.AddToCategories(category);
                                northWind.SaveChanges();
                                return RedirectToAction("Index");

                        }
                        else
                        {
                                return RedirectToAction("Create");
                        }                        
                }

                public ActionResult About()
                {
                        return View();
                }
        }
}

5、創建視圖，在相應的控制器處，直接右擊，添加視圖，各項選擇都如下圖。這邊有個主意的地方就是，我一開始的時候選擇強類型視圖，怎麼選擇都是沒有Categories，後來通過網上查詢，發現是自己沒有先編譯生成。

6、在視圖中，自己也嘗試着進行簡單的修改，當然不是CSS跟JS這些啦，畢竟還沒到那層次。主要還是關鍵字的顯示跟隱藏。

@Html.HiddenFor(model => model.CategoryID)

7、測試了ValidationMessageFor與ValidationMessage。

@Html.ValidationMessageFor(model => model.Description)

@Html.ValidationMessage("CategoryName","*")

這兩個的效果大家可以自己測試下。

8、最終效果。

9、遺留問題：

   最後還有2個問題在學習的時候未解決。a、路由：系統自動創建是MapRoute，add的方法我沒試過；b、就是在編輯的時候如果我內容出現<>這種字符，就會報錯。如果<>連寫就是會被自動解析成"&lt;&gt;"，如果是<字段值>，就會報錯"

從客戶端(Description="<Test>")中檢測到有潛在危險的 Request.Form 值。

"。