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.net training in gandhinagar C#/.NET Basics 2 Some code is from “C# in a Nutshell” and “Programming C#” http://shreedhoon.com/training/aspNetTraining.php

This week • Event Handling and delegates • ASP.NET Web Forms • ASP.NET Web Services http://shreedhoon.com/training/aspNetTraining.php

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 http://shreedhoon.com/training/aspNetTraining.php

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 http://shreedhoon.com/training/aspNetTraining.php

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(); } } http://shreedhoon.com/training/aspNetTraining.php

Delegate (3) Delegate reference 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 Encapsulated method http://shreedhoon.com/training/aspNetTraining.php

Multicast Delegate using System; // From C# In A Nutshell delegate void MethodInvoker(); // define delegate class class Test { static void Main() { // create a Test object // and call its constructor new Test(); } http://shreedhoon.com/training/aspNetTraining.php

Test() { MethodInvoker m = null; m += new MethodInvoker(Foo); // overloaded += m += new MethodInvoker(Goo); // delegate holds m(); // pointers to two } // methods MethodInvoker void Foo() m void Goo() http://shreedhoon.com/training/aspNetTraining.php

void Foo() { Console.WriteLine("Foo"); } void Goo() { Console.WriteLine("Goo"); } } Output: Foo Goo http://shreedhoon.com/training/aspNetTraining.php

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 standard browser http://shreedhoon.com/training/aspNetTraining.php

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” file http://shreedhoon.com/training/aspNetTraining.php

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. http://shreedhoon.com/training/aspNetTraining.php

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 http://shreedhoon.com/training/aspNetTraining.php

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 http://shreedhoon.com/training/aspNetTraining.php

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) http://shreedhoon.com/training/aspNetTraining.php

Web Form Step-by-step(1) (1) Start with a simple C# program – Divider.cs using 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)); } } http://shreedhoon.com/training/aspNetTraining.php

Web Form Step-by-step(2) (2)Compile to a .dll csc –t:library Divider.cs • Run .NET New Project choose C# select .NET Web Application enter location: http://localhost/ADivider http://shreedhoon.com/training/aspNetTraining.php

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 http://shreedhoon.com/training/aspNetTraining.php

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” http://shreedhoon.com/training/aspNetTraining.php

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. http://shreedhoon.com/training/aspNetTraining.php

ASP.NET Web Services(2) (1) Start with a simple C# program – Divider.cs using 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)); } } http://shreedhoon.com/training/aspNetTraining.php

ASP.NET Web Services(3) (2)Compile to a .dll csc –t:library Divider.cs • Run .NET New Project choose C# select ASP .NET Web Service enter location: http://localhost/ADividerWS http://shreedhoon.com/training/aspNetTraining.php

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 client http://shreedhoon.com/training/aspNetTraining.php

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