.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>