Asp.Net MVC 之 View

一、使用View Data

首先要在Controller里加代码：

    public class ProductController : Controller    {        //        // GET: /Product/        public ActionResult Index()        {            ViewData["Message"] = "Hello World";            return View();        }    }

 

然后在View里添加代码：

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<ToyStore.Models.Products>" %><asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">    Index</asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">    <h2>Index</h2>    <%=ViewData["Message"] %></asp:Content>

内容就被传递了，但这样由于传入的值可能是任何类型的，所以你要自己做类型转换了，哈哈。

ViewData.Model是可以让你有个强类型的

ViewData.Model = _dataModel.ProductSet.ToList(); 

 

二、预防javascript注入攻击

默认是预防的，如果不想使用看下面的代码：

[ValidateInput(false)]  [AcceptVerbs(HttpVerbs.Post)]  public ActionResult Create([Bind(Exclude="Id")]Product productToCreate)  {      if (!ModelState.IsValid)          return View();        try      {          _dataModel.AddToProductSet(productToCreate);          _dataModel.SaveChanges();            return RedirectToAction("Index");      }      catch      {          return View();      }  } 

 

主要是那个[ValidateInput(false)]

三、可替换的View Engine

Asp.net Mvc里的View Engine是可以替换的，默认的engine是叫做Web Forms View Engine.现在已经有几个开源的View Engine了

http://www.codeplex.com/MVCContrib 可以到这里找找看，一个网站可以同时使用几个View Engine，可以在Global.asax里配置，使用不同的扩展名来区分使用不同View Engine 比如：.aspx页面就使用Web Forms View Engine.

我们也可以自定义一个View Engine,从VirtualPathProviderViewEngine 继承出一个类就可以了。

using System.Web.Mvc;    namespace MvcApplication1.MyViewEngines  {      public class SimpleViewEngine : VirtualPathProviderViewEngine      {          public SimpleViewEngine()          {              this.ViewLocationFormats = new string[] { "~/Views/{1}/{0}.simple", "~/Views/Shared/{0}.simple"};              this.PartialViewLocationFormats = new string[] { "~/Views/{1}/{0}.simple", "~/Views/Shared/{0}.simple" };          }            protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath)          {              var physicalPath = controllerContext.HttpContext.Server.MapPath(viewPath);              return new SimpleView(physicalPath);          }            protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)          {              var physicalPath = controllerContext.HttpContext.Server.MapPath(partialPath);              return new SimpleView(physicalPath);          }      }  } 

在Global.asax里这样写

protected void Application_Start()  {      RegisterRoutes(RouteTable.Routes);        ViewEngines.Engines.Add(new SimpleViewEngine());  } 

 

然后自己写一个view的页面类：

 

namespace MvcApplication1.MyViewEngines  {      public class SimpleView : IView      {          private string _viewPhysicalPath;            public SimpleView(string viewPhysicalPath)          {              _viewPhysicalPath = viewPhysicalPath;          }                   #region IView Members            public void Render(ViewContext viewContext, TextWriter writer)          {              // Load file              string rawContents = File.ReadAllText(_viewPhysicalPath);                // Perform replacements              string parsedContents = Parse(rawContents, viewContext.ViewData);                // Write results to HttpContext              writer.Write(parsedContents);          }           #endregion            public string Parse(string contents, ViewDataDictionary viewData)          {              return Regex.Replace(contents, "//{(.+)//}",m => GetMatch(m, viewData));          }            protected virtual string GetMatch(Match m, ViewDataDictionary viewData)          {              if (m.Success)              {                  string key = m.Result("$1");                  if (viewData.ContainsKey(key))                  {                      return viewData[key].ToString();                  }              }              return string.Empty;          }            }  }

定义一个Controller：

using System.Web.Mvc;    namespace MvcApplication1.Controllers  {      public class SimpleController : Controller      {          public ActionResult Index()          {              ViewData["message"] = "Hello World!";              return View();          }      }  }

 

而页面可以写成：Views/Simple/Index.simple

 

<html>    <head><title>Index Simple View</title></head>    <body>    <h1>{message}</h1>    </body>    </html>  

 

主要看{message}被解析出来了