1. BIT 286: Web Applications Lecture 04 : Thursday, January 15, 2015 ASP.Net MVC -

2. Examining the Edit Methods and Edit View  http://www.asp.net/mvc/overview/getting- started/introduction/examining-the-edit-methods-and- edit-view http://www.asp.net/mvc/overview/getting- started/introduction/examining-the-edit-methods-and- edit-view  Using Entity Framework attributes to annotate model fields  Using the Html helper (ActionLink method to generate path via routing)  Postbacks  2 nd method with bound object  Redirecting  Anti-forgery token 2

3. Using EF attributes to better define DB table using System; using System.ComponentModel.DataAnnotations; using System.Data.Entity; namespace MvcMovie.Models { public class Movie { public int ID { get; set; } public string Title { get; set; } [Display(Name = "Release Date")] // default was “ReleaseDate” [DataType(DataType.Date)] [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)] public DateTime ReleaseDate { get; set; } public string Genre { get; set; } public decimal Price { get; set; } } public class MovieDBContext : DbContext { public DbSet Movies { get; set; } } 3

4. C# Attributes (aka “Annotations” in Java)  “C# provides a mechanism for defining declarative tags, called attributes, which you can place on certain entities in your source code to specify additional information.”  “Entities” – classes, methods, instance variables, etc.  “The information that attributes contain can be retrieved at run time through reflection. You can use predefined attributes or you can define your own custom attributes. ” -- MSDNreflectionpredefined attributes MSDN  NUnit used these ( [Test], [TestFixture], [Category], etc) 4

5. Date formats  There’s a page for the DisplayFormat attributeDisplayFormat  According to the docs, this can usedocs  Various standard formatting codes for C#’s date&time typesstandard formatting codes for C#’s date&time types  Custom formats (This is what the page is using) Custom formats  For example, "{0:dddd, MMMM d, yyyy}" will produce: Friday, January 1, 1999 5

6. The Html helper class  How to link from, say, the Index page to the Details page?  In Views/Movies/Index.cshtml @Html.ActionLink("Edit", "Edit", new { id=item.ID }) | @Html.ActionLink("Details", "Details", new { id=item.ID }) | @Html.ActionLink("Delete", "Delete", new { id=item.ID }) 6

7. Html.ActionLink method  @Html.ActionLink("Details", "Details", new { id=item.ID }) |  First arg is the text to put on the page  Second arg is the name of the method on this controller to link to  Movies.Details  Third arg is an anonymous object with info needed to build the path  This actually builds the path based on the routing info in App_Data/RouteConfig.cs  You can change your routing and all the links will change  Details at MSDN Details at MSDN  There are other versions if you want to link to a different controller (e.g., back to the overall home page) 7