aspnet
Programming with ASP.NET Programming with ASP.NET
Hà Đ ng H ng
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Objectives
• ASP.NET and the Microsoft® .NET Framework
– “Looking back...“ – Concepts and Architecture
• ASP.NET Application
– Models
• Using Visual Studio .NET
– Visual demos
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Objectives
• ASP.NET and the Microsoft® .NET Framework
– “Looking back...“ – Concepts and Architecture
• ASP.NET Application
– Models
• Using Visual Studio .NET
– Visual demos
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Looking Back: Active Server Pages
• What is ASP?
– Server-side scripting technology – Files containing HTML and scripting code – Access via HTTP requests – Scripting code is interpreted on server side
• What can I do with ASP?
– Easily and quickly create simple Web applications – Generate dynamic Web content – Client-side scripting for validation – Access COM components to extend functionality
• Databases
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What’s Wrong with That?
• Mixes layout (HTML) and logic (scripting code)
•
Interpreting ASP code leads to performance loss
• Uses scripting languages that are not strongly typed
– Microsoft JScript® – Microsoft Visual Basic® Scripting Edition (VBScript)
• Browser compatibility
• No real state management
– No state sharing across Web farms – State is lost when IIS fails
• Update files only when server is down
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ASP.NET Core Concepts
• Separate layout and business logic
• Use services provided by the .NET Framework
• Code is compiled the first time a page is requested
• State management
• Make use of programming languages
– Cross-language integration
• Update files while the server is running!
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Architecture
• The .NET Framework Architecture
• Web Application Model
• Class Hierarchy
• Advantages
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The .NET Framework Architecture
Microsoft .NET Framework
ASP.NET
Windows Forms
Web Forms Web Services
Services Framework
Base
Data
Debug
...
Common Language Runtime
System Services
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Web Application Model
Web Client
IIS
ASP.NET Applications
.NET Framework
Operating System
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Class Hierarchy 1/2
• Namespaces
– Hierarchically structured – Dot-syntax, grouping classes logically – Abstract base classes and class implementations
• You are free to implement your own
– Sample: System.Web.UI.WebControls.Button
namespace
class name
– How to use namespaces:
• Sample:
using MyAlias = System.Web.UI.WebControls
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Class Hierarchy 2/2
System.Object
System.Web.UI.Control
WebControl
System.Web.UI. WebControls
ListControl
Table
ListBox
Button
CheckBoxList
TextBox
...
...
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Advantages
• Execute more quickly
• On-the-fly updates of deployed Web app
• Access to the .NET Framework
• Many programming languages
• Server controls
• Built-in security
•
Integration with Microsoft ADO.NET
• Full support for XML, CSS
• Built-in features for caching, cultures…
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Objectives
• ASP.NET and the Microsoft® .NET Framework
– “Looking back...“ – Concepts and Architecture
• ASP.NET Application
– Models
• Using Visual Studio .NET
– Visual demos
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Parts of a Web Application
• Content
– Web Forms, HTML, images, audio, video, other data
• Program logic
– Executable files, scripts
• Configuration
– Web configuration file, Style sheets, IIS settings
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Parts of ASP.NET App
•
In a completed Web application, the executable portion of the Web form is stored in an executable (.dll) that runs on the server under the control of IIS.
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Application cycle
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Role of .NET Framework
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Objectives
• ASP.NET and the Microsoft® .NET Framework
– “Looking back...“ – Concepts and Architecture
• ASP.NET Application
– Models
• Using Visual Studio .NET
– Visual demos
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The Visual Studio .NET programming environment
• Start page
– contains various panes to make information easier to find and to help simplify some common tasks, such as opening a recent file
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The Visual Studio .NET programming environment
• Visual Studio .NET Windows: two types of
windows: – Document windows: display the content of your application: the forms, Web pages, and code
– Tool windows: display the components you use to
create your application.
• Controls
• database connections
• Classes
• properties
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The Visual Studio .NET programming environment
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The Visual Studio .NET programming environment
• Toolbox
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The Visual Studio .NET programming environment
• Solution Explorer
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Editing Web documents
• Editing HTML
• Editing code (VB.NET, C# …)
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Running a Project
• Toolbar: choosing Start from
the Debug menu
• Keyboard: F5.
ERROR ?? ?
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Results
• Cool webpage!
• Error webpage!
– Known error ->
Correct it
– Unknown error ->
Set breakpoint and Debug
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Getting Help
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Summary
• Web applications – run on a server, – processing user requests for pages and composing those pages using executable code and static resources on the server.
– Web applications can provide dynamic content based on
dynamic server resources, such as a database, and based on user inputs,
– ASP.NET Web applications are made up of content, an
executable, and configuration files.
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Summary
• The content of a Web application is presented through
Web forms. – use HTML components like conventional HTML pages; – they can also respond to user events such as mouse clicks.
• Assemblies
– The Web application' s executable is stored in a .dll file called
an assembly
– are compiled to an intermediate state – the final compilation is done by the CLR just before running the
application.
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Summary
• Visual Studio .NET Start page
– view current product information, to open new or existing
projects, to set user environment preferences, and to sign up for Web hosting services.
• Edit Web Forms pages and HTML pages:
– visually by using the Document window' s Design mode; edit them as text by using the Document window' s HTML mode.
• Set the Help language filter
– view code samples in a single programming language or in
multiple languages.
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