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03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
03 view fundamentals
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03 view fundamentals

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Transcript

  1. View Fundamentals1
  2. 2 The Views mission is simple: show theuser the model›  The Controller instantiates the model and sends it to the view. The view simply draws it›  It just has to know how to turn the model into HTML
  3. 3 The View is rendered from theControllerpublic ActionResult Whatever()!{! return View();!}!›  Assumes view name is the same as the action›  Looks for it in ›  Views/ControllerName ›  Views/Shared
  4. 4 You can specify the name of theview and controller›  SpecifyActionpublic ActionResult Whatever()!{! return View("New");!}!›  Action and Controllerpublic ActionResult Whatever()!{! return View("~/Views/Other/Other.cshtml");!}!
  5. Hands-on view rendering
  6. Passing data to the view1.  ViewData2.  ViewBag3.  Use strongly-typed views
  7. 7 ViewData›  A dictionary<string, object>›  To set in the controllerViewData["Focus"] = new Person() {! FirstName="Leslie", ! LastName="Winkle", ! Occupation="Experimental Physicist" !};!›  To read in the view@{!var person = (Person) ViewData["Focus"];!}!
  8. ViewBag is a Dynamic object›  In controller action:ViewBag.Greeting = "Hello World";!return View();!›  In view:<p>@ViewBag.Greeting</p>!
  9. Hands-on passing data to the view
  10. Strongly-typed views›  In view, add a new top line@model Person›  … or …@model ICollection<Person>›  Then the page recognizes the properties of that class<p>Name: @Model.FirstName @Model.LastName</p><p>@Model.Occupation</p>
  11. We pass the model to the viewpublic ActionResult DoSomething(){ var p = new Person() { FirstName = "Amy", MiddleName = "Farrah", LastName = "Fowler", Occupation = "Neurobiologist" }; return View(model);}
  12. Hands-on strongly-typed views
  13. 13 Conclusion›  The controller generates data to present to the user›  It presents that through the view›  So we must get data from the controller to the view through ›  ViewData ›  ViewBag ›  Strongly-typed Views

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