Views

Razor in MVC (View)

Eyal VardiCEO E4D Solutions LTDMicrosoft MVP Visual C#blog: www.eVardi.com

Agenda

Razor Syntax

Master-Page View

Partial View

Helper Classes

Razor Syntax

Razor Design Goals

Compact, Expressive, and Fluid

Easy to Learn

Is not a new language

Works with any Text Editor

Has great Intellisense

Unit Testable

What To Choose?

ASPX vs. Razor

Single Statement Blocks

@{ var total = 7; }@{ var myMessage = "Hello World"; } <p>The value of your account is: @total </p><p>The value of myMessage is: @myMessage</p>

Multi-Statement Block

@{ var greeting = "Welcome to our site!"; var weekDay = DateTime.Now.DayOfWeek; var greetingMessage = greeting + " Today is: " + weekDay;}

<p>The greeting is: @greetingMessage</p>

Lines of Content

@for( int i=0 ; i < 3 ; i++ ){ @:Line <b>@i</b> of content <br/>}

// Option II

@for( int i=0 ; i < 3 ; i++ ){ <text> Line <b>@i</b> of content <br/> </text> }

Code Comments

@{ @* This is a comment. *@ @* var theVar = 17; *@ }

@* This is a multiline code comment. It can continue for any number of lines. *@

@* A one-line code comment. *@

@{ // This is a comment. var myVar = 17; /* This is a multi-line comment that uses C# commenting syntax. */ }

Master Page

RenderPage

@Html.Partial()

<html> <body> @Html.Partial("PartialIndex");

@RenderBody()

</body></html>

E4D.cshtml

Master Page

<!DOCTYPE html><html> <body> <div id="Header">My Header</div> <div id="main"> @RenderBody() </div> </body></html>

E4D.cshtml

@{ Layout = "~/Views/Shared/E4D.cshtml"; ViewBag.Title = "Home Page";}<h2>@ViewBag.Message</h2><p> @{ for( int i=0 ; i < 5 ; i++ ) { <b>Hello World.</b><br/> } }</p>

Index.cshtml

Master Page

The _ViewStart File

Can be used to define common view code that you want to execute at the start of each View’s rendering.

@{ Layout = "~/Views/Shared/E4D.cshtml";}

_ViewStart.cshtml

Layout Section

<html> <head>ASP.NET MVC 3.0</head> <body> @RenderSection("Header") @RenderBody() @RenderSection("Footer", required: false) </body> </html>

E4D.cshtml

@{ Layout = "~/Views/Shared/_Layout.cshtml"; } <html> <head>ASP.NET MVC 3.0</head> <body> @section Header { <div>Header content</div> } <div>Body Content</div> @section Footer { <div>Footer content</div> } </body> </html>

Index.cshtml

Master Page & Sections

IsSectionDefined method

The IsSectionDefined method returns true if a child content page defined a section.

<html> <body> @RenderBody() @if ( IsSectionDefined("OptionalContent") ) { @RenderSection("OptionalContent") } else { <div>Default content</div> } </body></html>

E4D.cshtml

Use Razor Inline Templates

public static class SectionExtensions { private static readonly object _o = new object(); public static HelperResult RenderSection( this WebPageBase page, string sectionName, Func<object, HelperResult> defaultContent) { if (page.IsSectionDefined(sectionName)) return page.RenderSection(sectionName); else return defaultContent(_o); } }

<body> ... @this.RenderSection( "Footer", @<div>Default content</div>) </body>

Passing Data to Layout Pages

PageData Collection<html> <head>@PageData["Title"]</head> <body> @RenderSection("Header") @RenderBody() @RenderSection("Footer", required: false) </body> </html>

E4D.cshtml

@{ Layout = "~/Views/Shared/_Layout.cshtml"; @PageData["Title"] = “Passing Datat to Layout”; } <html> <head>ASP.NET MVC 3.0</head> <body> @Section("Header"){ <div>Header content</div> } <div>Body Content</div> @Section("Footer"){ <div>Footer content</div> } </body> </html>

Index.cshtml

HTML Helper

HtmlHelper Class

Helper methods and extensions are called using the Html property of the view, which is an instance of the HtmlHelper class. Extension methods for the HtmlHelper class are in the

System.Web.Mvc.Html namespace.

@Html.CheckBox("Test it");

Basic HTML Helpers

ActionLink

BeginForm

CheckBox

DropDownList

Hidden

ListBox

Password

RadioButton

TextArea

TextBox

Basic HTML Helpers

Advance HTML Helpers

Chart Renders a chart, offering the same features as the chart control in

ASP.NET 4.

WebGrid Renders a data grid, complete with paging and sorting functionality.

Crypto Uses hashing algorithms to create properly salted and hashed

passwords.

WebImage

WebMail

Advance HTML Helpers

@helper Syntax

@helpers Across Multiple Views

Custom HTML Helper

public static class LabelExtensions{ public static string Label( this HtmlHelper helper, string target, string text) { return String .Format("<label for='{0}'>{1}</label>", target, text); }}

TagBuilder Class

Represents a class that is used by HTML helpers to build HTML elements.

public static class ImageHelper{ public static MvcHtmlString Image(this HtmlHelper helper, string id, string url, string alt) { var builder = new TagBuilder("img"); builder.GenerateId(id);

// Add attributes builder.MergeAttribute("src", url); builder.MergeAttribute("alt", alt); return new MvcHtmlString( builder.ToString(TagRenderMode.SelfClosing) ); }}

Custom HTML Helper

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