.Net training In gandhinagar

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C#/.NET

Basics 2Some code is from “C# in a

Nutshell” and “Programming C#”

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.net training in gandhinagar

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This week

• Event Handling and delegates• ASP.NET Web Forms• ASP.NET Web Services

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Event Handling Model

• Delegates listen for the events and call registered handlers

• Each component has a delegate for every event it can raise

• We register a method with the delegate and the delegate will call the method asynchronously

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Delegates (1)

• A Button, for example, needs to notify some object when it is pushed

• We don’t want to hardwire (in the button) which object to call

• A delegate is a reference type used to encapsulate a method with particular parameter types

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Delegate (2)using System;delegate String Foo(String x); // create a delegate class

class Test {

public static void Main() { Foo f = new Foo(ConvertToUpperCase); // create a delegate object String answer = f("abcd"); // call the method in the // object Console.WriteLine(answer); } public static String ConvertToUpperCase(String s) { return s.ToUpper(); }}

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Delegate (3)public class Form1 : System.Windows.Forms.Form {

private System.Windows.Forms.Button multiplyButton;

public void foo() { this.multiplyButton = new System.Windows.Forms.Button(); this.multiplyButton.Text = "Multiply";

this.multiplyButton.Click += new System.EventHandler(this.multiplyButton_Click); } private void multiplyButton_Click(object sender, System.EventArgs e)

{textBox3.Clear();string op1Str = op1.Text;string op2Str = op2.Text;

: }

Delegate reference

Delegate

Encapsulatedmethod

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Multicast Delegateusing System; // From C# In A Nutshelldelegate void MethodInvoker(); // define delegate class class Test { static void Main() { // create a Test object // and call its constructor new Test(); }

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Test() {

MethodInvoker m = null; m += new MethodInvoker(Foo); // overloaded += m += new MethodInvoker(Goo); // delegate holds m(); // pointers to two } // methods

m

MethodInvokervoid Foo()

void Goo()

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void Foo() { Console.WriteLine("Foo"); } void Goo() { Console.WriteLine("Goo"); }}

Output:FooGoo

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ASP.NET Web Forms (1)

• Web Forms bring rapid appplication development to the web

• Similar technology is available on J2EE platforms (struts, Java Server Faces)

• Drag and drop development for the web tier – write event handlers as in Windows

Forms• User interacts with the sever via a

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ASP.NET Web Forms (2)

• Web pages are dynamically generated• Standard HTML is sent to the browser• Notepad would work but Visual Studio

makes life easy• The user interface code is in an .aspx file• The logic (C# code) is stored in a separate

file (containing event handling code)• Every .aspx file has this “code-behind” file04/26/23

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ASP.NET Web Forms (3)

• Postback events are handled on the server with an HTTP request. For example, the submit button is clicked.

• Non-postback events are not handled by the server immediately. For example, text is entered into a form or the mouse is moved.

• State is automatically added to an otherwise stateless protocol. .NET maintains the user’s session.

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Web Form Life Cycle

• Complicated series of activities similar to what is found in J2EE struts and JSF

• For this class let’s just say that a lot of pre- and post-processing goes on for each web request

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Creating A Web Form(1)

• Prerequisites: IIS and Front Page Server Extensions (use Internet Service Manager and right click on the web site/All Tasks/Configure Server Extensions)

• Start/Microsoft Visual Studio .NET/ New Project/Visual C#/ASP.NET Web Application/BinomialTreeWebApp

• Generated code goes into c:\Inetpub\wwwroot\BinomialTreeWebApp

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Creating A Web Form(2)

• Two files generated - The .aspx file holds the HTML - The aspx.cs file holds the C#• To see the C# code right click the form

and select view code• Note that you can see the design view or

the HTML view (tabs on bottom)

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Web Form Step-by-step(1)(1) Start with a simple C# program – Divider.csusing System;

public class Divider {

public int divide(int a, int b) { return a / b; } public static void Main(String[] args) {

Divider s = new Divider(); Console.WriteLine(s.divide(10,5)); }}

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Web Form Step-by-step(2)

(2) Compile to a .dll csc –t:library Divider.cs

(3) Run .NET New Project choose C# select .NET Web Application enter location: http://localhost/ADivider

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Web Form Step-by-step(3)

(4) Paint the screen in design mode(5) Right click to get to backing code(6) Add a reference to the .dll with

Project/Add Reference(7) Use the class

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Web Services

“The internet is evolving from a collection of isolated web sites and applications into a general communication bus for distributed applications.”

Pradeep Tapadiya, author of “.NET Programming”

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ASP.NET Web Services(1)

0) Check if IIS is running by attempting to visit http://localhost

1) If it's not running click Start/Settings/Control Panel/Add Remove Programs/ Add Remove Windows Components and enable IIS.2) If .NET was installed after IIS reconfigure IIS by

running aspnet_regiis.exe /i from a command prompt.

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ASP.NET Web Services(2)(1) Start with a simple C# program – Divider.csusing System;

public class Divider {

public int divide(int a, int b) { return a / b; } public static void Main(String[] args) {

Divider s = new Divider(); Console.WriteLine(s.divide(10,5)); }}

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ASP.NET Web Services(3)

(2) Compile to a .dll csc –t:library Divider.cs

(3) Run .NET New Project choose C# select ASP .NET Web Service enter location: http://localhost/ADividerWS

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ASP.NET Web Services(4)

(4) Add a reference to the .dll with Project/Add Reference

(5) Edit the web service sample so that it provides the correct signature and calls

the divide method(6) Get the WSDL document from a browser(7) Run wsdl, compile the result, and write a

client04/26/23

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