Difference between revisions of "OOP Class9"
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[[Category:Object Oriented Programming]] | [[Category:Object Oriented Programming]] | ||
+ | ==Private instance data members - accessors== | ||
+ | Microsoft has stared calling private variables with accessors Properties | ||
+ | |||
+ | Private class memebers the use get and set keyword to set and retrieve data. Get and set are known as accessor methods private members are helpful when you want to also do other things when a data member is changed or change the rutern value under certain conditions. C# Programmer's Reference - Accessors http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csref/html/vclrfaccessorspg.asp. Lastly accessor also make read only and write only variables possible | ||
+ | |||
+ | <csharp>//private string color read/write | ||
+ | private string color; | ||
+ | |||
+ | public string Color | ||
+ | { | ||
+ | get | ||
+ | { | ||
+ | return color; | ||
+ | } | ||
+ | set | ||
+ | { | ||
+ | color = value; | ||
+ | } | ||
+ | } | ||
+ | |||
+ | //private string color read only | ||
+ | private string color; | ||
+ | |||
+ | public string Color | ||
+ | { | ||
+ | get | ||
+ | { | ||
+ | return color; | ||
+ | } | ||
+ | }</csharp> | ||
+ | |||
+ | |||
+ | Another property that is a good candidate for a private instance data member is the dogs age | ||
+ | |||
+ | <csharp> | ||
+ | private string age; | ||
+ | |||
+ | public int Age | ||
+ | { | ||
+ | //age can only be accessed with get there is no set accessor | ||
+ | //age must be set with HappyBirthday() | ||
+ | get | ||
+ | { | ||
+ | return age; | ||
+ | } | ||
+ | } | ||
+ | |||
+ | public int HappyBirthday() | ||
+ | { | ||
+ | age++; | ||
+ | return age; | ||
+ | } | ||
+ | |||
+ | |||
+ | </csharp> | ||
+ | |||
+ | ==About aspx== | ||
+ | |||
+ | [[VS Web Projects]] | ||
+ | |||
+ | {{Anatomy of an aspx page}} | ||
+ | |||
+ | ==Simple Aspx Page== | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class8/Aspx/hello.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/Aspx/hello.aspx hello.aspx] | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class8/Aspx/hello2.aspx | ||
+ | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/Aspx/hello2.aspx hello2.aspx] | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class8/Aspx/Label.aspx | ||
+ | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/Aspx/Label.aspx Label.aspx] | ||
+ | |||
+ | In class | ||
+ | Build three hello aspx pages similar to the ones above | ||
+ | |||
+ | ==Dogs on the web== | ||
+ | [http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class8/DogWeb DogWeb] | ||
+ | |||
+ | |||
+ | |||
+ | {{HTML and HTTP}} | ||
+ | |||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class9/htmlForms.html [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/htmlForms.html htmlForms.html - source] | ||
+ | |||
+ | ==Courses on the Web== | ||
+ | [http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class8/StudentWeb Student Web] | ||
+ | |||
+ | ==Response Object== | ||
+ | |||
+ | Response.Write() | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class10/Response/Response1.aspx | ||
+ | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class10/Response/Response1.aspx Response1.aspx - source] | ||
+ | |||
+ | Response.End() | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class10/Response/Response2.aspx | ||
+ | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class10/Response/Response2.aspx Response2.aspx - source] | ||
+ | |||
+ | Response.Clear() | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class10/Response/ResponseClear.aspx | ||
+ | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class10/Response/ResponseClear.aspx ResponseClear.aspx - source] | ||
+ | |||
+ | Response.Flush() | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class10/Response/ResponseFlush.aspx | ||
+ | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class10/Response/ResponseFlush.aspx ResponseFlush.aspx - source] | ||
+ | |||
+ | |||
+ | ===Debugging with response object=== | ||
+ | |||
+ | Using the response buffer can be extreemely usefull for debugging. Sometime you may have to setup a small debug system to help catch errors in object that do not inherit from System.UI.Page. | ||
+ | |||
+ | Response.Flush() | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class10/Response/ResponseDebug.aspx | ||
+ | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class10/Response/ResponseDebug.aspx ResponseDebug.aspx - source] | ||
+ | |||
+ | ==Home Work== | ||
+ | |||
+ | Convert one of your classes to work as an aspx page. | ||
+ | |||
+ | Have a nice break.... | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ==Web Forms== | ||
+ | Examples of Web Forms | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class9/aspForms.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/aspForms.aspx aspForms.aspx - Source] | ||
+ | |||
+ | '''todo''' examples of all the html elements and how they react to form submits | ||
+ | |||
+ | ==Persisting Data== | ||
+ | |||
+ | ===POST and GET=== | ||
+ | |||
+ | http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class9 | ||
+ | |||
+ | an asps page posting to itself | ||
+ | |||
+ | '''GET''' | ||
+ | |||
+ | Simple get page | ||
+ | http://iam.colum.edu/oop/classsource/class9/simpleGet.html [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/simpleGet.html source] | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class9/simpleGet.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/simpleGet.aspx source] | ||
+ | |||
+ | '''POST''' | ||
+ | |||
+ | Simple post page http://iam.colum.edu/oop/classsource/class9/simplePost.html [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/simplePost.html source] | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class9/simplePost.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/simplePost.aspx source] | ||
+ | |||
+ | Simple post page http://iam.colum.edu/oop/classsource/class9/simplePostValues.html [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/simplePostValues.html source] | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class9/simplePostValues.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/simplePostValues.aspx source] | ||
+ | |||
+ | |||
+ | '''ASP POSTBACK''' | ||
+ | |||
+ | http://iam.colum.edu/oop/classsource/class9/postBack.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/postBack.aspx source] | ||
+ | |||
+ | {{ASPX csharp commands}} | ||
+ | |||
+ | ==Home Work== | ||
+ | |||
+ | Create a web page with a button that uses your class. | ||
Revision as of 14:26, 16 June 2009
Contents
Private instance data members - accessors
Microsoft has stared calling private variables with accessors Properties
Private class memebers the use get and set keyword to set and retrieve data. Get and set are known as accessor methods private members are helpful when you want to also do other things when a data member is changed or change the rutern value under certain conditions. C# Programmer's Reference - Accessors http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csref/html/vclrfaccessorspg.asp. Lastly accessor also make read only and write only variables possible
<csharp>//private string color read/write private string color;
public string Color {
get { return color; } set { color = value; }
}
//private string color read only private string color;
public string Color {
get { return color; }
}</csharp>
Another property that is a good candidate for a private instance data member is the dogs age
<csharp> private string age;
public int Age {
//age can only be accessed with get there is no set accessor //age must be set with HappyBirthday() get { return age; }
}
public int HappyBirthday() {
age++; return age;
}
</csharp>
About aspx
Anatomy of an aspx page
Page Directive The page directive must be on the first line of an aspx page. It consists of Name/Value Pairs and sets parameters that will be used throughout the execution of the page ie. the language.
<%@ Page language="c#" debug="True" trace="False"%>
C# Code may be embedded in the page using script tags similar to javascript
<script language="c#" runat="server">
</script>
Notice the runat attribute is set to 'server'. This is what makes the code execute on the server rather than be parsed by the client.
Console applications start executing in the main method
<csharp>public static void Main() {}</csharp>
The .Net Framework can also execute on the web. Rather than having a Main method a web page starts it's execution with a method called Page_Load
<csharp>public Page_Load { }</csharp>
There are actually several method that are executed in an aspx page.
http://samples.gotdotnet.com/quickstart/aspplus/
Simple Aspx Page
http://iam.colum.edu/oop/classsource/class8/Aspx/hello.aspx hello.aspx
http://iam.colum.edu/oop/classsource/class8/Aspx/hello2.aspx hello2.aspx
http://iam.colum.edu/oop/classsource/class8/Aspx/Label.aspx Label.aspx
In class Build three hello aspx pages similar to the ones above
Dogs on the web
HTML and HTTP
Http is a stateless protocol. There is mo mechanism built in to the protocol that allows the server to remeber clients or requests. An http simply responds to http verbs GET, POST, PUT, DEL, TRACE etc. contained in RFC 2068 HTTP/1.1
regular html forms post information using forms in 2 ways with a get or a post http request.
Get
- Get send information to the server using the URI. Limited to 1024 character in some browsers and servers.
Example http://iam.colum.edu/oop/classsource/class9/simpleGet.html simpleGet.html - source
The simpleGet.html pages form has the action of 'simpleGet.aspx' this mean that when the form is submitted the browser will request the 'simpleGet.aspx' with whatever parameters are in the form. Since the method = get these pararmeters will show up are query string parameters
URI and querystring parameters
URI - Universal Resource Identifier http://src.doc.ic.ac.uk/computing/internet/rfc/rfc1630.txt RFC1630
Http URI
Protcol | Host | Port | Path | File | Fragment identifier | Querystring |
---|---|---|---|---|---|---|
http:// | info.cern.ch | :8000 | /imaginary/test/ | file.html | #link | ?test=yes |
Post
- Post posts the variables in the HTTP Header.
Example http://iam.colum.edu/oop/classsource/class9/simplePost.html simplePost.html - source
FirstName: LastName: Header Name Value HttpMethod GET Connection keep-alive Keep-Alive 300 Accept text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Accept-Encoding gzip,deflate Accept-Language en-us,en;q=0.5 Cookie ASP.NET_SessionId=ezfgw255ix0zd5yogj3eawej Host imdev Referer http://imdev/infod/jeff/ User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1
REST
- Representational state transfer
https://www.ibm.com/developerworks/webservices/library/ws-restful/
http://www.infoq.com/articles/rest-introduction
http://iam.colum.edu/oop/classsource/class9/htmlForms.html htmlForms.html - source
Courses on the Web
Response Object
Response.Write()
http://iam.colum.edu/oop/classsource/class10/Response/Response1.aspx Response1.aspx - source
Response.End()
http://iam.colum.edu/oop/classsource/class10/Response/Response2.aspx Response2.aspx - source
Response.Clear()
http://iam.colum.edu/oop/classsource/class10/Response/ResponseClear.aspx ResponseClear.aspx - source
Response.Flush()
http://iam.colum.edu/oop/classsource/class10/Response/ResponseFlush.aspx ResponseFlush.aspx - source
Debugging with response object
Using the response buffer can be extreemely usefull for debugging. Sometime you may have to setup a small debug system to help catch errors in object that do not inherit from System.UI.Page.
Response.Flush()
http://iam.colum.edu/oop/classsource/class10/Response/ResponseDebug.aspx ResponseDebug.aspx - source
Home Work
Convert one of your classes to work as an aspx page.
Have a nice break....
Web Forms
Examples of Web Forms
http://iam.colum.edu/oop/classsource/class9/aspForms.aspx aspForms.aspx - Source
todo examples of all the html elements and how they react to form submits
Persisting Data
POST and GET
http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class9
an asps page posting to itself
GET
Simple get page http://iam.colum.edu/oop/classsource/class9/simpleGet.html source
http://iam.colum.edu/oop/classsource/class9/simpleGet.aspx source
POST
Simple post page http://iam.colum.edu/oop/classsource/class9/simplePost.html source
http://iam.colum.edu/oop/classsource/class9/simplePost.aspx source
Simple post page http://iam.colum.edu/oop/classsource/class9/simplePostValues.html source
http://iam.colum.edu/oop/classsource/class9/simplePostValues.aspx source
ASP POSTBACK
http://iam.colum.edu/oop/classsource/class9/postBack.aspx source
Events in c# and aspx
Event handlers
OnClick
http://iam.colum.edu/oop/classsource/class9/events/events1.aspx events1.aspx - source
OnCommand
http://iam.colum.edu/oop/classsource/class9/events/events2.aspx events2.aspx - source
http://iam.colum.edu/oop/classsource/class9/events/events3.aspx events3.aspx - source
<csharp>
<%@ Page language="c#" debug="True" trace="false"%>
<script language="c#" runat="server">
Dog fido; public void Page_Load() { fido = new Dog(); }
public void Button1_OnClick(Object sender, EventArgs e) { Response.Write("Hello from Button1_OnClick"); lblBark.Text = fido.Bark(); }
public class Dog { public string Name; // the dog's name public int Age; // the dog's age public int Weight; // the dog's weight public string BarkSound; // the sound of the dog's bark
public Dog() { BarkSound = "Woof!!!"; }
public string Bark() { return this.BarkSound; } public void Eat() { //put eat code here } }
</script>
Home Work
Create a web page with a button that uses your class.
Motorvehicle Diagram
http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class7/MotorvehicleRace
Windows forms
Events
- events from a windows form or web page are handled by event handlers. Events are raised when a user interacts with interface elements and handled by the event handlers.
http://www.csharphelp.com/archives/archive253.html
Examaple of event handlers and classes
http://iam.colum.edu/oop/MotorvehicleRace.zip
<csharp> private void button1_Click(object sender, EventArgs e)
{ Console.WriteLine("button1 Clicked"); MessageBox.Show("button1 Clicked"); }
</csharp>
Create a windows form with a button the uses your class.
<csharp> using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms;
namespace WindowsDog {
public partial class Form1 : Form { Dog fido; public Form1() { InitializeComponent(); fido = new Dog(); }
private void btnBark_Click(object sender, EventArgs e) { lblBark.Text = fido.Bark(); }
public class Dog { public string Name; // the dog's name public int Age; // the dog's age public int Weight; // the dog's weight public string BarkSound; // the sound of the dog's bark
public Dog() { BarkSound = "Woof!!!"; }
public string Bark() { return this.BarkSound; } public void Eat() { //put eat code here } } }
} </csharp>
Home Work
Put your class in a windows form. Use and event to call one of your methods.