ASP MVC

1_ Structure of master file

ASP
<%@ Master Language="C#" Inherits="System.Web.Mvc.ViewMasterPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title><asp:ContentPlaceHolder ID="TitleContent" runat="server" /></title>
</head>
<body>
  <h1>My MVC Application</h1>

  <asp:ContentPlaceHolder ID="MainContent" runat="server" />
</body>
</html>

2_ Structure of view file

ASP
<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    My Home Page
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    Hello
</asp:Content>

   MasterPageFile has to refer to the location of the master file
   asp:Content with ContentPlaceHolderID TitleContent is referenced as master page title
   asp:Content with ContentPlaceHolderID MainContent  is referenced as master page content

3_ Controller file content

C#
  using System.Web.Mvc;
  public class HomeController : Controller
  {
      public ActionResult Index()
      {
          return View();  // returned View will be ~/Home/Index.aspx
      }
  }

4_ How to pass data between controller and View in ASP MVC 2

C#
   ViewData["MyText"] = "from HomeController";

and extend asp:Content element with ContentPlaceHolderID="MainContent" as below

ASP
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    Hello <%: ViewData["MyText"]%>
</asp:Content>

5_ How to pass data between controller and View in ASP MVC 4

In MVC 4, you can use ViewBag

Assign the value in the controller

C#
ViewBag.MyMessage="hello";

and read it in the view

CSHTML
@ViewBag.MyMessage

6_ What are the basic files that need to be added to an empty app

Add Views/Shared/Site.Master - xHTML site that hosts any site, e.g. Index.aspx as ContentControl 
Add Views/Home/Index.aspx - embedded content
Add Controllers/HomeController.cs - controller for views under Views/Home  
global.asax.cs - created by Visual Studio

7_ How to pass data between controller and View with model in ASP MVC 2

C#
public class MyModel
{
    public string MyMessage { get; set; }
}

In the controller, create new instance of MyModel class, set the property and pass to the view

C#
public ActionResult Index()
{
    var model = new MyModel();
    model.MyMessage = "hello model";
    return View(model);
}

You need to update the view:
1. tell the view page about the type of the model in the inherits section, "AspMvcDemo1.Models.MyModel"
2. use any model class property - intellisense works here, but if you make a typo, compiler will not catch it!

ASP
<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<AspMvcDemo1.Models.MyModel>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
        MyMessage: <%: Model.MyMessage %>
</asp:Content>

8_ How to pass data between controller and View with model in ASP MVC 4

MVC 4 approach in .cshtml

CSHTML
@model AspMvcDemo1.Models.MyModel
...
MyMessage: @Model.MyMessage

9_ Describe application object with event handlers

ASP
public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start() { }
    protected void Application_End() { }

    // Application_BeginRequest
    // Application_EndRequest
    // Application_AuthenticateRequest
    
    void Application_Error(object sender, EventArgs e)
    {
        Exception exc = Server.GetLastError();
        ...
        Server.ClearError();
    }

    void Session_Start(object sender, EventArgs e) { }
    void Session_End(object sender, EventArgs e) { }
 }

10_ How to navigate between pages?

ASP
  <%: Html.ActionLink("TextVisibleToUser", "NameofMethodInController", "ControllerName", new { @myParamName = "abc" } )%>

11_ How to create a link that points out of project

If you need to create a link that points out of the project where you cannot use @Html.ActionLink that requires controllers and views, you can use @Html.Raw

CSHTML
  @Html.Raw("<a href=\"" + Model.Link + "\">Go here</a>")

12_ Describe routing section for one page

Routing is defined global.asax.cs. This file gets created by Visual Studio and it gets populated with default routing. You can add another routing or modify default routing.

C#
public static void RegisterRoutes(RouteCollection routes)
{
    routes.MapRoute(
        "Default", // Route name - has to be unique
        "{controller}/{action}/{id}", // URL with parameters
        new { controller = "Home", action = "Index", id = UrlParameter.Optional } // defaults if URL does not contain all sections, e.g. /Home will use /Home/Index
    );
}

13_ Describe attribute routing options

you need to call MapMvcAttributeRoutes()

C#
public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapMvcAttributeRoutes();
    
    // you can still use classic definition here
}
...
public class PersonsController : Controller
{
    // /people will handled by PersonsController
    [Route("people")] 
    public ActionResult View(string id) {...}
}

C#
[RoutePrefix("people")]    // prefix for all actions
[Route("{action=index}")]  // default route  
public class PersonsController : Controller
{
    // /people/id 
    [Route("Id"), name="personById"]  // named route  
    public PersonActionResult View(string id)   {...}
}

..

// named route 
<a href="@Url.RouteUrl("personById")">Person by id</a>

14_ How to use bundles

BundleConfig.cs is created by Visaul Studio under App_Start folder

C#
public class BundleConfig
{
    // For more information on bundling, visit http://go.microsoft.com/fwlink/?LinkId=301862
    public static void RegisterBundles(BundleCollection bundles)
    {
        bundles.Add(new StyleBundle("~/Content/css").Include(
                  "~/Content/bootstrap.css",
                  "~/Content/Site.css"
                  ));

         bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
                   "~/Scripts/jquery-{version}.js"));
    }
}

Defined bundles can be rendered e.g. in Views/Shared/_Layout.cshtml

CSHTML
<html>
<head>
  ...
  @Styles.Render("~/Content/css")
</head>
<body>
  ...
  @Scripts.Render("~/bundles/jquery")
</body>
</code>

15_ How to use sections

web page Template is stored in shared/_layout.cshtml

CSHTML
<html>
<body>
@RenderBody();  // includes view content that is not included in section(s) 

@IsSectionDefined("mySection")
{
  @RenderSection("mySection");  // includes specific section
}
else { ... }

@RenderSection("mySection", required:false);  // skips if section does not exist
<body>
<html>

page details are in myview.cshtml that gets embedded into _layout.cshtml

CSHTML
@section mySection {
a html content
}

16_ How to use partial pages

CSHTML
<html>
<body>
@Html.Partial("CompanyName");  // includes HTML from myPartialView 
<body>
<html>

CompanyName.cshtml

CSHTML
<h1>Company One</h1>
@ ... another code

17_ How to read arguments passed through ?argName=argValue

It is still possible to pass arguments to the controller like http://myserver/mysite?personId=1

C#
string myArgValue = Request.QueryString["personId"];   //   myArgValue = 1

18_ How to read and write session variables

In a controller code you can use Session, which is collection of values

C#
   this.Session["userId"] = 123;

19_ How to write and read cookie (for userName)

Write cookie inside the controller processing the request after user clicks the Login button

C#
public class LoginController : Controller 
{
  public ActionResult Login(string userName, string password)
  {
    this.Response.Cookies.Add(new System.Web.HttpCookie("userName", userName));
  }
}

Read cookie when login page gets loaded

C#
public class LoginController : Controller
{
    public ActionResult Index()
    {
      HttpCookie cookie = this.Request.Cookies["userName"];
      if (cookie != null)
      {
          ViewBag.UserName = cookie.Value;
      }
      else
      {
          ViewBag.UserName = string.Empty;
      }
    }
}

20_ How to authenticate users

IIS: Windows Authentication must be enabled, Anynomous MUST be disabled

CMD
<system.web>
  <authentication mode="Windows" />
</system.web>

C#
// inside controller (or view) 
string userName = this.Request.LogonUserIdentity.Name;

// alternatively you can use shortcut
string userName = this.User.Identity.Name;

21_ How to display collection with model

C#
public ActionResult Index()
{
    List<Person> people = new List<Person>();
    people.Add(new Person() { Name = "Paul", Height=178 });
    people.Add(new Person() { Name = "George", Height=182 });
    return View(people);
}

You need to update the view to describe type that will hold the collection as List<"AspMvc2Empty.Models.Person">

ASP
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<List<AspMvc2Empty.Models.Person>>" %>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

   <table>
    <% foreach (var item in Model) {%>

       <tr>
       
           <td> <%: item.Name %> </td>

           <td> <%: item.Height %> </td>
       
       </tr>

    <% } %>

    </table>

</asp:Content>

or in MVC 4 with Razor syntax

CSHTML
@model List<AspMvcBasics.Models.Person>
@{
    ViewBag.Title = "People";
}
<table>
    @foreach (var item in Model)
    {
        <tr>
            <td>
                @item.Name
            </td>
            <td>
                @item.Height
            </td>
        </tr>
    }
</table>

22_ Create Login form

If the form contain a ListBox, it necessary to pass data to feed the ListBox

C#
public class LoginController : Controller
{
    public ActionResult PrepareLogin()
    {
        // data for list box
        SelectList selection = new SelectList(
        new[] { 
                new { Value = "A", Text = "Team A" }, 
                new { Value = "B", Text = "Team B" }, 
                new { Value = "C", Text = "Team C" }, 
            },
        "Value",
        "Text"
        );

        return View(selection);
    }
 }

Code in the view could look like below

CSHTML
@model SelectList
@using (Html.BeginForm("HandleLogin", "Login"))
{
  User name: @Html.TextBox("userName", "JohnFirst")
  Password: @Html.Password("password")
  
  Remember me: @Html.CheckBox("rememberUserName", false)
  
  @Html.RadioButton("server", "s1", true) @:Server 1
  @Html.RadioButton("server", "s2", false ) @:Server 2
  
  @Html.ListBox("team", Model, new { size = 20 } )
  
  <input type="submit" value="Login" />
}

Note: when RadioButton is inside a container (div, td) then @: must be ommited

Wenn uses clicks "Login", the action called will the Index method in HomeController and values from input elements will be passed as arguments.

C#
public class LoginController : Controller
{
    public ActionResult HandleLogin(string userName, string password, 
         string rememberUserName, string server, string team)
    {
      ....
      return View();
    }
 }

23_ Asscociate style with a textbox in a form

C#
@Html.TextBox("userName", (string)ViewBag.UserName, new { @class = "k-textbox" } )

24_ Display PDF file content, e.g. PDF

In order to display content of file like PDF it necessary that an Action returns content of the file. It can be achieved with FilePathResult, FileContentResult or FileStreamResult.

C#
public FilePathResult Report()
{
    return new FilePathResult(@"c:\myfolder\myfile.pdf", "application/pdf");
}

// The FileContentResult approach enables file deletion in case the file was generated 
public FileContentResult Report()
{
  byte[] content = System.IO.File.ReadAllBytes(@"c:\myfolder\myfile.pdf");
  System.IO.File.Delete(@"c:\myfolder\myfile.pdf");
  return new FileContentResult(content, "application/pdf");
}

25_ Debugging remote requests