Introduction to ASP.NET and Web Forms
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1 Introduction to ASP.NET and Web Forms This material is based on the original slides of Dr. Mark Sapossnek, Computer Science Department, Boston University, Mosh Teitelbaum, evoch, LLC, and Joe Hummel, Lake Forest College Outline Background ASP.NET Overview Programming Model Programming Basics Server Controls Data Binding Conclusion
2 Background Web Architecture Client PC/Mac/Unix/... + Browser Request: Network HTTP, TCP/IP Response: <html>.</html> Server Web Server Background Web Development Technologies Client-side technologies XHTML, CSS, DOM, JavaScript Server-side technologies ASP (Active Server Pages) ASP.NET is the next generation of ASP
3 Background What is ASP? Server-side programming technology Consists of static HTML interspersed with script ASP intrinsic objects (Request, Response, Server, Application, Session) provide services Commonly uses ADO to interact with databases Application and session variables Application and session begin/end events ASP manages threads, database connections. Background What is ASP? HTTP request (form data, HTTP header data) HTTP response HTML, XML ASP page (static HTML, server-side logic)
4 Background Example: HelloWorld.asp <html> <head><title>helloworld.asp</title></head> <body> <form method= post"> <input type="submit" id=button1 name=button1 value="push Me" /> <% if (Request.Form("button1") <> "") then Response.Write "<p>hello, the time is " & Now() end if %> </form> </body> </html> Background ASP Challenges Coding overhead (too much code) Everything requires writing code! Code readability (too complex; code and UI intermingled) Maintaining page state [After submit button is clicked, if we click the back button, we expect to maintain scroll position, maintain which control had focus, and restore focus, or allow server code to focus a new control ] requires more code Session state scalability and availability Limited support for caching, tracing, debugging, etc. Performance and safety limitations of script
5 Outline Background ASP.NET Overview Programming Model Programming Basics Server Controls Data Binding Conclusion ASP.NET Overview ASP.NET provides services to allow the creation, deployment, and execution of Web Applications and Web Services Like ASP, ASP.NET is a server-side technology Web Applications are built using Web Forms Web Forms are designed to make building web-based applications as easy as building Visual Basic applications
6 ASP.NET Overview Goals Keep the good parts of ASP and improve the rest Simplify: less code, easier to create and maintain Multiple, compiled languages Fast Scalable Manageable Available Customizable and extensible Secure Tool support ASP.NET Overview Key Features Web Forms Web Services Built on.net Framework Simple programming model Maintains page state Multibrowser support XCOPY deployment XML configuration Complete object model Session management Caching Debugging Extensibility Separation of code and UI Security Simplified form validation Cookieless sessions
7 ASP.NET Overview Example: HelloWorld.aspx Page language="c#" %> <html> <head></head> <script runat="server"> public void B_Click (object sender, System.EventArgs e) { Label1.Text = "Hello, the time is " + DateTime.Now; } </script> <body> <form method="post" runat="server"> <asp:button onclick="b_click" Text="Push Me runat="server /> <br> <asp:label id=label1 runat="server" /> </form> </body> </html> ASP.NET Overview Architecture ASP.NET is built upon.net Framework Internet Information Server (IIS)
8 ASP.NET Overview Architecture Internet Information Server (IIS) IIS MMC Snap-In (Internet Services Manager) Tool to manage IIS Virtual Directories Provides a mapping between URL and file path E.g., on my machine the URL: maps to the file path: C:\cs6910Summer06 ASP.NET Overview Architecture VB C++ C# JScript Common Language Specification ASP.NET: Web Services and Web Forms ADO.NET: Data and XML Base Classes Windows Forms Visual Studio.NET Common Language Runtime
9 Outline Background ASP.NET Overview Programming Model Programming Basics Server Controls Data Binding Conclusion Programming Model Controls and Events Server-side programming model Based on controls and events Just like Visual Basic Not data in, HTML out Higher level of abstraction than ASP Requires less code More modular, readable, and maintainable
10 Programming Model Controls and Events Button Button code... List List code... Text Text code... Browser ASP.NET Event handlers Programming Model ASP.NET Object Model User code executes on the web server in page or control event handlers Controls are objects, available in server-side code Derived from System.Web.UI.Control The web page is an object too Derived from System.Web.UI.Page which is a descendant of System.Web.UI.Control A page can have methods, properties, etc.
11 Programming Model Postbacks A postback occurs when a page generates an HTML form whose values are posted back to the same page A common technique for handling form data In ASP and other server-side technologies the state of the page is lost upon postback... Unless you explicitly write code to maintain state This is tedious, bulky and error-prone Programming Model Postbacks Maintain State By default, ASP.NET maintains the state of all server-side controls during a postback Can use method="post" or method="get" Server-side control objects are automatically populated during postback No state stored on server Works with all browsers
12 Programming Model Server-side Controls Multiple sources of controls Built-in 3 rd party User-defined Controls range in complexity and power: button, text, drop down, calendar, data grid, ad rotator, validation Can be populated via data binding Programming Model Automatic Browser Compatibility Controls can provide automatic browser compatibility Can target UpLevel or DownLevel browsers UpLevel browsers support additional functionality, such as JavaScript and DHTML DownLevel browsers support HTML 3.2
13 Programming Model Automatic Browser Compatibility IE 4 Button Menu Text Netscape Button Menu Text IE 5.5 Button Menu Text Button Control Menu Control Text Control Button code... Menu code... Text code... IE 6 Button Menu Text... ASP.NET Event handlers Programming Model Code-behind pages Two styles of creating ASP.NET pages Controls and code in.aspx file Controls in.aspx file, code in code-behind page Supported in Visual Studio.NET Code-behind pages allow you to separate the user interface design from the code Allows programmers and designers to work independently <%@ Codebehind= WebForm1.cs Inherits=WebApplication1.WebForm1 %>
14 Programming Model Automatic Compilation Just edit the code and hit the page ASP.NET will automatically compile the code into an assembly Compiled code is cached in the CLR Assembly Cache Subsequent page hits use compiled assembly If the text of the page changes then the code is recompiled Works just like ASP: edit, save and run Programming Model Automatic Compilation
15 Outline Background ASP.NET Overview Programming Model Programming Basics Server Controls Data Binding Conclusion Programming Basics Page Syntax The most basic page is just static text Any HTML page can be renamed.aspx Pages may contain: Directives: Page Language= C# %> Server controls: <asp:button runat= server > Code blocks: <script runat= server > </script> Data bind expressions: <%# %> Server side comments: <%-- --%> Render code: <%= %> and <% %> Use is discouraged; use <script runat=server> with code in event handlers instead
16 Programming Basics The Page Directive Lets you specify page-specific attributes, e.g. AspCompat: Compatibility with ASP Buffer: Controls page output buffering CodePage: Code page for this.aspx page ContentType: MIME type of the response ErrorPage: URL if unhandled error occurs Inherits: Base class of Page object Language: Programming language Trace: Enables tracing for this page Transaction: COM+ transaction setting Only one page directive per.aspx file Programming Basics Server Control Syntax Controls are declared as HTML tags with runat= server attribute <input type=text id=text2 runat= server /> <asp:calendar id=mycal runat= server /> Tag identifies which type of control to create Control is implemented as an ASP.NET class The id attribute provides programmatic identifier It names the instance available during postback Just like Dynamic HTML
17 Programming Basics Server Control Properties Tag attributes map to control properties <asp:button id= c1" Text="Foo" runat= server > <asp:listbox id= c2" Rows="5" runat= server > Tags and attributes are case-insensitive Control properties can be set programmatically c1.text = Foo ; c2.rows = 5; Programming Basics Maintaining State By default. controls maintain their state across multiple postback requests Implemented using a hidden HTML field: VIEWSTATE Works for controls with input data (e.g. TextBox, CheckBox), non-input controls (e.g. Label, DataGrid), and hybrids (e.g. DropDownList, ListBox) Can be disabled per control or entire page Set EnableViewState= false Lets you minimize size of VIEWSTATE
18 Programming Basics Maintaining State Example: MaintainingState.aspx Programming Basics Server Code Blocks Server code lives in a script block marked runat= server <script language="c#" runat=server> <script language="vb" runat=server> <script language="jscript" runat=server> Script blocks can contain Variables, methods, event handlers, properties They become members of a custom Page object
19 Programming Basics Page Events Pages are structured using events Enables clean code organization Avoids the Monster IF statement Less complex than ASP pages Code can respond to page events e.g. Page_Load, Page_Unload Code can respond to control events Button1_Click Textbox1_Changed Programming Basics Page Event Lifecycle Initialize Restore Control State Load Page Control Events 1. Change Events 2. Action Events Save Control State Render Unload Page Page_Init Page_Load Textbox1_Changed Button1_Click Page_Unload
20 Programming Basics Page Loading Page_Load fires at beginning of request after controls are initialized Input control values already populated protected void Page_Load(Object s, EventArgs e) { message.text = textbox1.text; } Programming Basics Page Loading Page_Load fires on every request Use Page.IsPostBack to execute conditional logic If a Page/Control is maintaining state then need only initialize it when IsPostBack is false protected void Page_Load(Object s, EventArgs e) { if (! Page.IsPostBack) { // Executes only on initial page load Message.Text = "initial value"; } // Rest of procedure executes on every request }
21 Change Events Programming Basics Server Control Events By default, these execute only on next action event E.g. OnTextChanged, OnCheckedChanged Change events fire in random order Action Events Cause an immediate postback to server E.g. OnClick Works with any browser No client script required, no applets, no ActiveX Controls! Programming Basics Wiring Up Control Events Control event handlers are identified on the tag <asp:button onclick="btn1_click runat=server> <asp:textbox onchanged="text1_changed runat=server> Event handler code protected void btn1_click(object s, EventArgs e) { Message.Text = Button1 clicked ; }
22 Programming Basics Event Arguments Events pass two arguments: The sender, declared as type object Usually the object representing the control that generated the event Allows you to use the same event handler for multiple controls Arguments, declared as type EventArgs Provides additional data specific to the event EventArgs itself contains no data; a class derived from EventArgs will be passed Programming Basics Page Unloading Page_Unload fires after the page is rendered Don t try to add to output Useful for logging and clean up protected void Page_Unload(Object s, EventArgs e) { MyApp.LogPageComplete(); }
23 Programming Basics Import Directive Adds code namespace reference to page Avoids having to fully qualify.net types and class names Equivalent to the C# using directive Import Namespace="System.Data" %> Import Namespace="System.Net" %> Import Namespace="System.IO" %> Programming Basics Page Class The Page object is always available when handling server-side events Provides a large set of useful properties and methods, including: Application, Cache, Controls, EnableViewState, EnableViewStateMac, ErrorPage, IsPostBack, IsValid, Request, Response, Server, Session, Trace, User, Validators DataBind(), LoadControl(), MapPath(), Validate()
24 Outline Background ASP.NET Overview Programming Model Programming Basics Server Controls Data Binding Conclusion Server Controls ASP.NET ships with ~50 built-in controls Organized into logical families HTML controls Controls / properties map 1:1 with HTML Web controls Richer functionality More consistent object model
25 Server Controls HTML Controls Work well with existing HTML designers Properties map 1:1 with HTML table.bgcolor ="red ; Can specify client-side event handlers Good when quickly converting existing pages Derived from System.Web.UI.HtmlControls.HtmlControl Supported controls have custom class, others derive from HtmlGenericControl Server Controls HTML Controls Supported controls <a> <img> <form> <table> <tr> <td> <th> <select> <textarea> <button> <input type=text> <input type=file> <input type=submit> <input type=button> <input type=reset> <input type=hidden>
26 Server Controls HTML Controls Example: HTMLControls.aspx Basic page lifecycle with HTML Controls Consistent object model Server Controls Web Controls Label1.BackColor = Color.Red; Table.BackColor = Color.Blue; Richer functionality E.g. AutoPostBack, additional methods Automatic uplevel/downlevel support E.g. validation controls Strongly-typed; no generic control Enables better compiler type checking
27 Server Controls Web Controls Web controls appear in HTML markup as namespaced tags Web controls have an asp: prefix <asp:button onclick="button1_click runat=server> <asp:textbox onchanged="text1_changed runat=server> Defined in the System.Web.UI.WebControls namespace This namespace is automatically mapped to the asp: prefix Server Controls Web Controls Web Controls provide extensive properties to control display and format, e.g. Font BackColor, ForeColor BorderColor, BorderStyle, BorderWidth Style, CssClass Height, Width Visible, Enabled
28 Server Controls Web Controls Four types of Web Controls Intrinsic controls List controls Rich controls Validation controls Server Controls Intrinisic Controls Correspond to HTML controls Supported controls <asp:button> <asp:radiobutton> <asp:imagebutton> <asp:linkbutton> <asp:image> <asp:hyperlink> <asp:label> <asp:textbox> <asp:panel> <asp:checkbox> <asp:table> Specify AutoPostBack=true to make change events cause a postback
29 Server Controls List Controls Controls that handle repetition Supported controls <asp:dropdownlist> <asp:listbox> <asp:radiobuttonlist> <asp:checkboxlist> <asp:repeater> <asp:datalist> <asp:datagrid> Server Controls CheckBoxList & RadioButtonList Provides a collection of check box or radio button controls Can be populated via data binding <asp:checkboxlist id=check1 runat="server"> <asp:listitem>item 1</asp:ListItem> <asp:listitem>item 2</asp:ListItem> <asp:listitem>item 3</asp:ListItem> <asp:listitem>item 4</asp:ListItem> <asp:listitem>item 5</asp:ListItem> </asp:checkboxlist>
30 Server Controls Intrinisic & Simple List Controls Example: WebControls.aspx Assorted intrinsic and list controls with AutoPostBack Server Controls Rich Controls Custom controls with rich functionality Supported Controls <asp:calendar> <asp:adrotator> More will be added 3 rd party controls are coming Example: RichControls.aspx
31 Server Controls Validation Controls Rich, declarative validation Validation declared separately from input control Extensible validation framework Supports validation on client and server Automatically detects uplevel clients Avoids roundtrips for uplevel clients Server-side validation is always done Prevents users from spoofing Web Forms Server Controls Validation Controls <asp:requiredfieldvalidator> Ensures that a value is entered <asp:rangevalidator> Checks if value is within minimum and maximum values <asp:comparevalidator> Compares value against constant, another control or data type <asp:regularexpressionvalidator> Tests if value matches a predefined pattern <asp:customvalidator> Lets you create custom client- or server-side validation function <asp:validationsummary> Displays list of validation errors in one place
32 Server Controls Validation Controls Validation controls are derived from System.Web.UI.WebControls.BaseValidator, which is derived from the Label control Validation controls contain text which is displayed only if validation fails Text property is displayed at control location ErrorMessage is displayed in validation summary Server Controls Validation Controls Validation controls are associated with their target control using the ControlToValidate property <asp:textbox id=textbox1 runat=server /> <asp:requiredfieldvalidator id="req1" ControlToValidate="TextBox1" Text="Required Field" runat=server /> Can create multiple validation controls with the same target control
33 Server Controls Validation Controls Page.IsValid indicates if all validation controls on the page succeed void Submit_click(object s, EventArgs e) { if (Page.IsValid) { Message.Text = "Page is valid!"; } } Server Controls Validation Controls Display property controls layout Static: fixed layout, display won t change if invalid Dynamic: dynamic layout None: no display; can still use ValidationSummary and Page.IsValid Type property specifies expected data type: Currency, Date, Double, Integer, String
34 Server Controls Validation Controls Can force down-level option Only server-side validation Page Language="c#" ClientTarget="DownLevel" %> Server Controls Validation Controls Example: ValidationControls.aspx
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