Understanding the Structure and Functioning of an ASP.NET Page, Slides of Computer Programming

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Anatomy of an ASP.NET

Page

My Version

of the Big Picture (1)

ASP Worker (Engine)

Your application Runs

Server

Other applications

User 1 User 2

Session 1 Session 2 Client (Browser)

Request Response

What is an ASP.NET Page?

 Roughly speaking, an ASP.NET page contains  Markup (appears in the .aspx page)  Server-side code that the ASP.NET worker executes (appears in the .aspx page or in a separate code behind page)  The resulting HTML is sent out to the client (browser) by the asp worker process

ASP.NET Coding

 There are two ways to do it  Inline (code appears in the same file as the .aspx file)  Put in a **

ASP.NET Code Behind

 They are matching .aspx and .aspx.cs files that are hopelessly tied together  @Page directives are important  The CodeBehind attribute points to the .cs file  The Language attribute identifies the programming language  VB / C#

ASP.NET Code Behind

Compiling

an

ASP page

(Illustration)

IIS File Mappings

 .asax – application files  .ascx – ASP user controls  .asmx – Web services  .aspx – ASP.NET Web pages

Processing Directives (1)

 Processing directives are used to configure the runtime environment  Directives can appear anywhere on a page but best practices dictate that they appear at the beginning of the page  Directives begin with <%@ and end with %>  Make sure you don’t forget the %>

Processing Directives (2)

 Processing directive are used to configure the runtime environment  Processing directives have the following format: <%@ directive_name attribute=“value” attribute=“value” %>

Processing Directives

( @ Page )

 It can appear only in .aspx pages  Attributes are divided into roughly three categories  Compilation  Page behavior  Page output

 There are other tools to configure the same options beyond processing directives

Processing Directives

Page Compilation

 CodeFile lists the file containing the VB or C# code for the .aspx page  Language describes the programming language for the CodeFile  ClassName explicitly sets the name of the class created upon compilation

Introduction to the Page Class

 The Page class provides the basic behavior for an ASP Web page  It’s objects allow you to reference  The application itself ( Application )  The server itself ( Server )  The HTTP request ( HttpRequest )  The HTTP response ( HttpResponse )  The user’s session ( Session )

Introduction to Page Events

 First, this topic is very important to getting your ASP applications to work  ASP uses the eventing model to  Persist state from one postback to the next  Create static and dynamic controls  Bind control instances to data sources  And much more  As your book says “state is an illusion of continuity”