net qr code open source REACTIVE EXTENSIONS FOR .NET in Office Word

Drawer QR Code ISO/IEC18004 in Office Word REACTIVE EXTENSIONS FOR .NET

CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
QR Code Creator In None
Using Barcode creation for Microsoft Word Control to generate, create QR image in Office Word applications.
www.OnBarcode.com
Draw Barcode In None
Using Barcode generator for Microsoft Word Control to generate, create Barcode image in Word applications.
www.OnBarcode.com
concepts, to leverage the power of Rx.NET on your own, you will have to understand these features of the .NET framework. The power of Reactive Framework can be applied to deal with a wide range of computational issues. In this chapter, we will focus on the way that the framework deals with a problem that is probably as old as the personal computer: how do you provide a responsive user interface while utilizing the full computational resources available And how can you do so in a manner that makes code readable and easy to manage/maintain
Code 128 Code Set C Creator In None
Using Barcode generation for Word Control to generate, create Code 128 Code Set C image in Word applications.
www.OnBarcode.com
Printing UPC-A Supplement 2 In None
Using Barcode generator for Office Word Control to generate, create UPC Symbol image in Word applications.
www.OnBarcode.com
Introducing Reactive Programming
Barcode Generator In None
Using Barcode printer for Microsoft Word Control to generate, create Barcode image in Word applications.
www.OnBarcode.com
QR Code 2d Barcode Creator In None
Using Barcode generation for Word Control to generate, create QR Code image in Office Word applications.
www.OnBarcode.com
Rx.NET aims to revolutionize reactive programming in the .NET framework. In reactive programming, you register an interest in something and have items of interest handed over, or pushed to the attention of the application, asynchronously, as they become available. A classic example an application that relies heavily on the reactive programming model is the spreadsheet, where an update to a single cell triggers cascading updates to every cell that references it. This concept of having things pushed down as they become available is particularly well suited to applications that use constantly changing data sources, such as the weather application that you will be building later on in this chapter. Reactive programming is often contrasted with interactive programming, where the user asks for something and then waits for it until it is delivered. To help further differentiate these concepts, let s take a look at a car shopping analogy. Usually, when shopping for a car, you go to a car dealership (or look online) and look at different car makes and models. You pick the ones you like and test-drive them. This arrangement is an example of interactive programming, where you asked for a car and got it in return. In a reactive approach, you would send a note to a dealership expressing interest in a certain make and model and then continue going on with your daily routine. The dealer locates items of interest and notifies you when they become available. Let s see if we can carry over this analogy to event processing on Windows Phone 7. For the sample application that you will be building later in this chapter, you will want to read the contents of a text box once it can be determined that no keystroke has occurred a half a second since the previous one. In the sample, this will be taken to mean that the user has finished typing and is ready for the application to do something. If you were to use an interactive approach, you would implement this by wiring up the KeyDown event for the text box, and then checking some sort of timer to see whether enough time had elapsed between keystrokes. In a reactive approach, as you will see shortly, things are much simpler: you express interest in being notified of KeyDown events only after a half-second has elapsed between a user s keystrokes. Once notified of such an event, you take action searching for photos online, in this case. Before you learn how to search for photos in a reactive manner, however, you will walk through several short examples to get a feeling for how Reactive Extensions implement the core Observer pattern, which forms the basis of the Reactive Framework and is described in detail in the following sidebar.
Printing EAN128 In None
Using Barcode encoder for Word Control to generate, create UCC.EAN - 128 image in Word applications.
www.OnBarcode.com
Drawing USPS OneCode Solution Barcode In None
Using Barcode drawer for Microsoft Word Control to generate, create Intelligent Mail image in Office Word applications.
www.OnBarcode.com
CHAPTER 18 REACTIVE EXTENSIONS FOR .NET
Denso QR Bar Code Recognizer In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Generating QR Code JIS X 0510 In Java
Using Barcode creator for Eclipse BIRT Control to generate, create QR-Code image in BIRT reports applications.
www.OnBarcode.com
THE OBSERVER PATTERN
Barcode Maker In None
Using Barcode creator for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
Decode PDF 417 In VS .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
The Observer pattern is a commonly used technique (pattern) in the world of object-oriented software development. At its basis, it has a Subject object that keeps track of all the objects (referred to as Observers) that want to be notified about changes to the Subject s state. All Observers are automatically notified of any changes to the Subject. The power of this pattern comes from not having to query the Subject for specific changes to its state the Subject will promptly let Observers know when it gets modified. For detailed description of the Observer pattern, you can refer to Design Patterns by Gamma et al. or you can read about it on Wikipedia at http://en.wikipedia.org/wiki/Observer_pattern . According to Microsoft DevLabs, where the Reactive Extensions library was developed, the objective of Rx.NET is to enable the composition of asynchronous and event-driven programs. Rx.NET uses observable collections to enable such composition. In Rx.NET, Observable collections perform the role of the Subject in the Observer pattern. Observable collections gather data associated with a given event or an asynchronous method call and notify everyone who has subscribed to these collections of the changes as they occur. This might sound a bit confusing, so let s jump into code that will allow you to start using key features of Rx.NET right away to build awesome Windows Phone 7 applications.
Universal Product Code Version A Generation In Java
Using Barcode encoder for Java Control to generate, create UPC Code image in Java applications.
www.OnBarcode.com
EAN / UCC - 13 Generator In Objective-C
Using Barcode creation for iPad Control to generate, create EAN / UCC - 13 image in iPad applications.
www.OnBarcode.com
GTIN - 12 Drawer In .NET
Using Barcode encoder for VS .NET Control to generate, create UPC Code image in .NET applications.
www.OnBarcode.com
USS Code 39 Generation In None
Using Barcode generation for Software Control to generate, create ANSI/AIM Code 39 image in Software applications.
www.OnBarcode.com
Creating Quick Response Code In .NET
Using Barcode drawer for .NET Control to generate, create QR-Code image in VS .NET applications.
www.OnBarcode.com
Create Code 39 In VS .NET
Using Barcode generator for .NET Control to generate, create Code39 image in VS .NET applications.
www.OnBarcode.com
Decoding EAN / UCC - 13 In Visual C#.NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
USS Code 39 Generation In Java
Using Barcode maker for Java Control to generate, create Code 39 image in Java applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.