CS411 Quiz & Flashcards: Chapter 24 Short Notes

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Questions and Answers

What is a more robust and loosely coupled version of events?

Execute

Built-in Commands

Commands (correct)

icommand

What does icommand include?

Execute, CanExecute, CanExecuteChanged

How can any object work as a command?

Using User Controls

Implementing Execute method

Extending WPF

Implementing icommand (correct)

Modal Dialogs are necessary to terminate explicitly in order to interact with the main window.

True Signup and view all the answers

WPF Input Events make possible ____________ interactive content.

rich Signup and view all the answers

What does Data Binding allow in XAML?

To bind two different properties together Signup and view all the answers

What does the Binding Object contain?

The Binding Object contains a source and target Object. Signup and view all the answers

Synchronization in binding means binding a single target with multiple sources.

False Signup and view all the answers

Example code of binding shows setting a property path like `Binding.Path = new PropertyPath(____)`.

SelectedItem.Header Signup and view all the answers

Which method can be used for cancellation in tasks?

CancellationSource.Cancel() Signup and view all the answers

What does DOM stand for?

Document Object Model Signup and view all the answers

What is the benefit of using JQuery for web development?

It provides a set of functions to simplify tasks like selecting elements, adding content, and reacting to user actions. Signup and view all the answers

Which of the following are basic selectors in JQuery? (Select all that apply)

By ID Name Signup and view all the answers

JQuery provides automatic looping for handling multiple elements.

True Signup and view all the answers

What method in JQuery is used to hide elements?

fadeOut Signup and view all the answers

Match the following web events with their descriptions:

click, dblclick, mousedown = Web mouse Events load, resize, scroll, unload = Doc/Window Events submit, reset, change, focus, blur = Form Events keypress, keydown, keyup = Keyboard Events Signup and view all the answers

What is the role of JavaScript in AJAX?

To send requests, wait for responses, process responses, and update web pages. Signup and view all the answers

Study Notes

CS411 Short Notes

Chapter 24

Commands are a more robust and loosely coupled version of events.
WPF defines a number of built-in commands.
Any object can work as a command by implementing ICommand.
ICommand includes three methods: Execute, CanExecute, and CanExecuteChanged.
Examples of built-in commands include:
- ApplicationCommands (e.g. Close, Save, Open)
- ComponentCommands (e.g. MoveDown, SelectToEnd)
- MediaCommands (e.g. ChannelDown, IncreaseVolume)
- NavigationCommands (e.g. BrowseBack, GoToPage)
- EditingCommands (e.g. AlignCenter, DecreaseFontSize)

Chapter 25

WPF Window is a Win32 window.
Any number of child windows can be made by instantiating a window-derived class and calling Show.
Child windows get closed or minimized when the parent window is closed or minimized.
Window events include:
- Activated
- Deactivated
StartupUri in XAML is used to specify the first page to be displayed.
System.Environment.GetCommandLineArgs is used to get command-line arguments in WPF.
Application-level events include:
- Startup
- Exit
- Activated
- Deactivated
- SessionEnding

Chapter 26

A wizard is a dialog box with multiple user interfaces.
A page in itself cannot be displayed; a window is an area containing a page.
Navigation-based apps are:
- Windows Explorer
- Media Player
- Photo Gallery
Host windows are:
- NavigationWindow
- Frame
Navigation containers provide:
- Navigating
- History journal
- Navigation-related events
A page can interact with its navigation container using the NavigationService class.

Chapter 27

Browser-based applications are partial-trust applications.
Partial trust means with some restrictions.
Silverlight is cross-platform, but WPF browser-based applications only run on Windows.
In web-based applications, the journal of the application and web browser are integrated.
GAC is a Global Assembly Cache.
ClickOnce applications are cached.
How to open a file from a local system:
- Use OpenFileDialog
Data can be given to any website using:
- URL Parameters
- Cookies
BrowserInteropHelper.Source is used to retrieve the complete URL.
Application.GetCookie is used to retrieve browser cookies.

Chapter 28

Localization means that an application can target more than one language or grammar.
To localize resources, it's necessary to make them embedded resources.
Logical resources are arbitrary .NET objects stored and named in an element's resource properties.
Logical resources can be categorized into:
- Static resources
- Dynamic resources
Dynamic resources allow for subscription to updates of the resource.

Chapter 29

Data binding allows for declaratively binding two different properties in XAML.
A binding object has one source and target object.
Binding binds two properties together and keeps a communication channel open.
PropertyPath can be used to specify the source property.
Synchronization means binding multiple targets with a single source.

Chapter 34

Asynchronous tasks take return quickly.
Asynchronous tasks are non-blocking.
For I/O-bound tasks, we can usually work without threads.
For CPU-bound tasks, we can start and return tasks, which are asynchronous tasks.
Example of CPU-bound asynchronous task:
- GetPrimesCount

Chapter 35

Write downloading code:
- async void Go()
- Use WebClient to download data
- Use await to wait for the task to complete
We can return a task from a void function without explicitly returning it.
If you have to write an asynchronous function, follow three steps:
- Write its totally synchronous version
- Then use await and async
- Then use return and return Task in place of void

Chapter 36

Task combinators:
- Task.WhenAny
- Task.WhenAll
Example of WhenAll in task combinators:
- await Task.WhenAll(Delay1(), Delay2(), Delay3())
There are two types of parallelism:
- Data parallelism
- Task parallelism
Three steps of parallelism:
- Partition problem
- Process
- Combine the results
Data parallelism is easier to perform and scales well, and it's also structured.
Task parallelism is more complex and harder to get right.
Concurrent collections are useful when you want a thread-safe collection.### Parallel Loop State
The ParallelLoopState class has several methods:
- Break()
- Stop()
- IsExceptional (getter)
- IsStopped (getter)
- LowestBreakIteration (getter)
- ShouldExitCurrentIteration (getter)

Concurrent Collections

Concurrent collections are three times slower than normal collections when writing, but not when reading.
Types of concurrent collections:
- ConcurrentStack
- ConcurrentQueue
- ConcurrentBag
- ConcurrentDictionary

HTML, JavaScript, and CSS

HTML is a Hyper Text Markup Language.
JavaScript is built-in and supported by all web browsers.
Web pages have three layers:
- HTML (content/structure)
- CSS (presentation)
- JavaScript (behavioral)
JavaScript was introduced in 1995 and was originally named "LiveScript" before being renamed to "JavaScript" and later to "JScript" by Microsoft for Internet Explorer.
jQuery is a JavaScript library that makes JavaScript programming easier by solving complexity and browser incompatibilities.
HTML basics:
- At least three tags are required: html (root tag), head (containing title, etc.), and body (containing all parts to be rendered in the browser window).
- Tags have specific meanings, such as p (paragraph), em (emphasis), and a (hyperlink).
- Validating HTML means checking if all tags are properly closed.

JavaScript

JavaScript is an interpreted language, meaning each line of code is compiled at runtime.
JavaScript basics:
- Variables are declared using var, and names can start with a letter, $, or _.
- Arrays can be created and manipulated using push, unshift, shift, and pop methods.
- Functions can be declared without specifying a return type.
JavaScript in HTML:
- JavaScript code is included in HTML using the script tag.
- JavaScript can be used to add/remove/change CSS properties, animate elements, and react to user actions.

jQuery

jQuery is a JavaScript library that simplifies tasks such as selecting elements, adding new content, hiding and showing content, and modifying tag attributes.
Benefits of jQuery:
- Small library size (30k compressed)
- Easy to learn
- Used on millions of websites
- Free and open-source
- Large developer community
- Plugins available
jQuery selectors:
- Basic selectors: by class name, by ID name, by tag name
- Advanced selectors: descendent, child, adjacent sibling, attribute
jQuery events:
- Mouse events: click, dblclick, mousedown, etc.
- Document/window events: load, resize, scroll, unload, etc.
- Form events: submit, reset, change, focus, blur, etc.
- Keyboard events: keypress, keydown, keyup, etc.

Ajax

Ajax is a term that allows JavaScript to communicate with the server without leaving the page.
What Ajax can do:
- Display new HTML content without reloading the page
- Submit a form and instantly display the result
- Login without leaving the page
Ajax process:
- Send a request to the server
- Wait for the response
- Process the response
- Update the web page
jQuery simplifies the Ajax process.

JSON

JSON is a JavaScript format for exchanging data.
JSON is a method for exchanging data between JavaScript and the server.
JSON is quick and easy for JavaScript.
JSON objects are similar to JavaScript object literals.
Example of a JSON object:

{
    "firstName": "Frank",
    "lastName": "Smith",
    "phone": "503-555-1212"
}

jQuery provides a getJSON method to retrieve JSON data from the server.

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Short notes on WPF commands, including command implementation and built-in commands. Covers topics such as icommand and Application Commands.

CS411 Chapter 24 Short Notes

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