.NET Mvc中ViewBag、ViewData、TempData如何使用

ViewBag 　　获取动态视图数据字典　　　　　　作用：给视图传递数据，不需要转换类型，由系统动态解析，比ViewData执行性能要差

ViewData 　  获取或设置视图数据的字典　　　　        给视图传递数据，需要转换成相应的类型，编写没有ViewBag方便，可读性强

TempData     临时数据的字典　　　　　　　　　　　  给控制器或视图传递数据，需要和ViewData一样进行类型转换，可以在多个控制器或页面传值，但是只能读取一次就为null了

后台代码

 //
         // GET: /CommonStudy/

         public ActionResult Index()
         {
             var model = Sxy.BLL.CradInfo.GetList("", "");

             this.ViewBag.SecondModelList = model.ToList();
             //自定义数据
             this.ViewData["ThirdModel"] = model.FirstOrDefault();
             //缓存,在下一个控制器可以取到当前的数据，但是只能去一次就释放了
             this.TempData["IndexCache"] = model.ToList();

             //只能被取一次，不管是视图使用还是控制器使用，只要其中一个使用了，当前临时缓存就为null了
             this.TempData["Temp"] = "设置一个缓存";

             return View(model);
         }

         //
         // GET: /CommonStudy/Create

         public ActionResult Create()
         {
             //获取IndexCache
             var tempData = this.TempData["IndexCache"];
             //转换成实例象
             var model = tempData as List<Sxy.Model.CradInfo>;
             var tempData2 = this.TempData["IndexCache"];
             //在当前控制存储，给后面一个控制器使用
             this.TempData["CreateCache"] = tempData2;

             //由于前面视图有使用到了这个临时缓存，现在已取不到了
             var temp = this.TempData["Temp"];

             return View();
         }

   //
         // POST: /CommonStudy/Create

         [HttpPost]
         public ActionResult Create(Sxy.Model.CradInfo model)
         {
             try
             {
                 // TODO: Add insert logic here
                 var tempData2 = this.TempData["IndexCache"];
                 var createCache = this.TempData["CreateCache"];
                 if (ModelState.IsValid)
                 {
                     if (Sxy.BLL.CradInfo.Add(model) > )
                     {

                     }
                 }

                 return RedirectToAction("Index");
             }
             catch
             {
                 return View();
             }
         }

前台代码

 @model IEnumerable<Sxy.Model.CradInfo>

 @{
     ViewBag.Title = "Index";
 }

 <h2>Index</h2>

 <p>
     @Html.ActionLink("Create New", "Create")
     @*临时数据*@
     @this.TempData["Temp"]

 </p>
 <table>
     <tr>
         <th>
             @Html.DisplayNameFor(model => model.userId)
         </th>
         <th>
             @Html.DisplayNameFor(model => model.carNumber)
         </th>
         <th>
             @Html.DisplayNameFor(model => model.carQueryPassword)
         </th>
         <th>
             @Html.DisplayNameFor(model => model.createTime)
         </th>
         <th></th>
     </tr>
     @*默认返回的Model*@
     @foreach (var item in Model)
     {
         <tr>
             <td>
                 @Html.DisplayFor(modelItem => item.userId)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => item.carNumber)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => item.carQueryPassword)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => item.createTime)
             </td>
             <td>
             @Html.ActionLink("Edit", "Edit", new { id = item.id }) |
             @Html.ActionLink("Details", "Details", new { id = item.id }) |
             @Html.ActionLink("Delete", "Delete", new { id = item.id })
             </td>
         </tr>
     }

     <tr>
         <td colspan="5">
             <hr />
         </td>

     </tr>
     @*自定义ViewData*@
     @foreach (var item in ViewData["SecondModelList"] as List<Sxy.Model.CradInfo>)
     {
         <tr>
             <td>
                 @Html.DisplayFor(modelItem => item.userId)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => item.carNumber)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => item.carQueryPassword)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => item.createTime)
             </td>
             <td>
                 @Html.ActionLink("Edit", "Edit", new { id = item.id }) |
             @Html.ActionLink("Details", "Details", new { id = item.id }) |
             @Html.ActionLink("Delete", "Delete", new { id = item.id })
             </td>
         </tr>
     }

     <tr>
         <td style="width: auto">
             <hr />
         </td>

     </tr>

     @{ var ThirdModel = ViewData["ThirdModel"] as Sxy.Model.CradInfo;
         <tr>

             <td>
                 @Html.DisplayFor(modelItem => ThirdModel.userId)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => ThirdModel.carNumber)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => ThirdModel.carQueryPassword)
             </td>
             <td>
                 @Html.DisplayFor(modelItem => ThirdModel.createTime)
             </td>
             <td>
                 @Html.ActionLink("Edit", "Edit", new { id = ThirdModel.id }) |
             @Html.ActionLink("Details", "Details", new { id = ThirdModel.id }) |
             @Html.ActionLink("Delete", "Delete", new { id = ThirdModel.id })
             </td>
         </tr>

     }

 </table>