.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) > 0)
                    {

                    }
                }


                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=" 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>