.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
1 // 2 // GET: /CommonStudy/ 3 4 public ActionResult Index() 5 { 6 var model = Sxy.BLL.CradInfo.GetList("", ""); 7 8 this.ViewBag.SecondModelList = model.ToList(); 9 //自定义数据 10 this.ViewData["ThirdModel"] = model.FirstOrDefault(); 11 //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 12 this.TempData["IndexCache"] = model.ToList(); 13 14 //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 15 this.TempData["Temp"] = "设置一个缓存"; 16 17 return View(model); 18 } 19 20 21 // 22 // GET: /CommonStudy/Create 23 24 public ActionResult Create() 25 { 26 //获取IndexCache 27 var tempData = this.TempData["IndexCache"]; 28 //转换成实例象 29 var model = tempData as List<Sxy.Model.CradInfo>; 30 var tempData2 = this.TempData["IndexCache"]; 31 //在当前控制存储，给后面一个控制器使用 32 this.TempData["CreateCache"] = tempData2; 33 34 //由于前面视图有使用到了这个临时缓存，现在已取不到了 35 var temp = this.TempData["Temp"]; 36 37 return View(); 38 } 39 40 // 41 // POST: /CommonStudy/Create 42 43 [HttpPost] 44 public ActionResult Create(Sxy.Model.CradInfo model) 45 { 46 try 47 { 48 // TODO: Add insert logic here 49 var tempData2 = this.TempData["IndexCache"]; 50 var createCache = this.TempData["CreateCache"]; 51 if (ModelState.IsValid) 52 { 53 if (Sxy.BLL.CradInfo.Add(model) > 0) 54 { 55 56 } 57 } 58 59 60 return RedirectToAction("Index"); 61 } 62 catch 63 { 64 return View(); 65 } 66 }
前台代码
1 @model IEnumerable<Sxy.Model.CradInfo> 2 3 @{ 4 ViewBag.Title = "Index"; 5 } 6 7 <h2>Index</h2> 8 9 <p> 10 @Html.ActionLink("Create New", "Create") 11 @*临时数据*@ 12 @this.TempData["Temp"] 13 14 </p> 15 <table> 16 <tr> 17 <th> 18 @Html.DisplayNameFor(model => model.userId) 19 </th> 20 <th> 21 @Html.DisplayNameFor(model => model.carNumber) 22 </th> 23 <th> 24 @Html.DisplayNameFor(model => model.carQueryPassword) 25 </th> 26 <th> 27 @Html.DisplayNameFor(model => model.createTime) 28 </th> 29 <th></th> 30 </tr> 31 @*默认返回的Model*@ 32 @foreach (var item in Model) 33 { 34 <tr> 35 <td> 36 @Html.DisplayFor(modelItem => item.userId) 37 </td> 38 <td> 39 @Html.DisplayFor(modelItem => item.carNumber) 40 </td> 41 <td> 42 @Html.DisplayFor(modelItem => item.carQueryPassword) 43 </td> 44 <td> 45 @Html.DisplayFor(modelItem => item.createTime) 46 </td> 47 <td> 48 @Html.ActionLink("Edit", "Edit", new { id = item.id }) | 49 @Html.ActionLink("Details", "Details", new { id = item.id }) | 50 @Html.ActionLink("Delete", "Delete", new { id = item.id }) 51 </td> 52 </tr> 53 } 54 55 <tr> 56 <td colspan="5"> 57 <hr /> 58 </td> 59 60 </tr> 61 @*自定义ViewData*@ 62 @foreach (var item in ViewData["SecondModelList"] as List<Sxy.Model.CradInfo>) 63 { 64 <tr> 65 <td> 66 @Html.DisplayFor(modelItem => item.userId) 67 </td> 68 <td> 69 @Html.DisplayFor(modelItem => item.carNumber) 70 </td> 71 <td> 72 @Html.DisplayFor(modelItem => item.carQueryPassword) 73 </td> 74 <td> 75 @Html.DisplayFor(modelItem => item.createTime) 76 </td> 77 <td> 78 @Html.ActionLink("Edit", "Edit", new { id = item.id }) | 79 @Html.ActionLink("Details", "Details", new { id = item.id }) | 80 @Html.ActionLink("Delete", "Delete", new { id = item.id }) 81 </td> 82 </tr> 83 } 84 85 <tr> 86 <td style="width: auto"> 87 <hr /> 88 </td> 89 90 </tr> 91 92 93 @{ var ThirdModel = ViewData["ThirdModel"] as Sxy.Model.CradInfo; 94 <tr> 95 96 <td> 97 @Html.DisplayFor(modelItem => ThirdModel.userId) 98 </td> 99 <td> 100 @Html.DisplayFor(modelItem => ThirdModel.carNumber) 101 </td> 102 <td> 103 @Html.DisplayFor(modelItem => ThirdModel.carQueryPassword) 104 </td> 105 <td> 106 @Html.DisplayFor(modelItem => ThirdModel.createTime) 107 </td> 108 <td> 109 @Html.ActionLink("Edit", "Edit", new { id = ThirdModel.id }) | 110 @Html.ActionLink("Details", "Details", new { id = ThirdModel.id }) | 111 @Html.ActionLink("Delete", "Delete", new { id = ThirdModel.id }) 112 </td> 113 </tr> 114 115 } 116 117 118 119 </table>
