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1.1 ViewData继承了IDictionary<string, object>,因此在设置ViewData属性时,传入key必须要字符串型别,value可以是任意类型。
1.2 ViewData它只会存在这次的HTTP要求而已,而不像Session可以将数据带到下HTTP要求。
public class TestController : Controller { public ActionResult Index() { ViewData["msg"] = "123123"; return View(); } }
@{ ViewBag.Title = "Index"; } <h2>页面</h2> <h2>@ViewData["msg"]</h2>
public class TestController : Controller { public ActionResult Index() { User aa = new User() { Age = 1, Name = "linq" }; //ViewData.Model = aa; return View(aa); } }
@{ ViewBag.Title = "Index"; } @model MvcApplication1.Models.User <h2>页面</h2> <h2>@Model.Age</h2> <h2>@Model.Name</h2>
3.1 严格来说ViewBag和ViewData的区别就是ViewBag是dynamic动态型别
public class TestController : Controller { public ActionResult Index() { User aa = new User() { Age = 1, Name = "linq" }; ViewBag.User = aa; return View(); } }
@{ ViewBag.Title = "Index"; } <h2>页面</h2> <h2>@ViewBag.User.Age</h2> <h2>@ViewBag.User.Name</h2>
4.1 TempData的信息在"一次网页要求内有效"(ActionResult的返回类型必须为RedirectToRouteResult或RedirectToRouteResult类别,除此以外只要有取用的TempData的键值，默认就会在当次网页就要求清除，但你只是单纯设置了TempData的值，并没有读取行为的话，TempData还是会保留到下次使用)
public class TestController : Controller { public ActionResult Index(string msg) { TempData["msg"] = msg; return RedirectToAction("Index2"); } public ActionResult Index2() { return View(); } }
ASP.NET MVC中ViewData、ViewBag和TempData
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原文地址：http://www.cnblogs.com/lgxlsm/p/5484185.html
