Building a Reusable Config Class in .NET

Implement qr codes in .NET Building a Reusable Config Class
Building a Reusable Config Class
Quick Response Code barcode library with .net
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in VS .NET applications.
ne of the most common external files you will find with any application is a configuration file. The purpose of a configuration, or config, file is to externalize settings so that they can be adjusted without needing to recompile the application. Though not mandatory, XML is usually the format of choice for creating a config file, and will be the format targeted for the Config class in this chapter to consume.
Integrate qrcode with .net
using visual studio .net topaint qr code in asp.net web,windows application
IN THIS CHAPTER
.net Vs 2010 qr code iso/iec18004 readerfor .net
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.
Defining the XML Resolving dynamic properties Using composition for event dispatching Global accessibility Your Config class in action
Barcode generator with .net
using .net framework crystal toinclude barcode in asp.net web,windows application
Defining the XML
Produce barcode in .net
use .net vs 2010 barcode integration todraw barcode for .net
Before you can get started on your class s architecture, you need to define what your XML will look like. Listing 15.1 is the basic structure you will be using.
Control qr code size on c#.net
to incoporate qr barcode and qr-codes data, size, image with .net c# barcode sdk
LISTING 15.1 < xml version= 1.0 encoding= UTF-8 > <config> <property name= exampleProperty1 value= I am value #1. /> <property name= exampleProperty2 value= I am value #2. /> <property name= exampleProperty3 value= I am value #3. /> </config>
Develop qr bidimensional barcode in .net
use asp.net web denso qr bar code printing toaccess quick response code on .net
Part IV
Control qr data on vb.net
to produce quick response code and qrcode data, size, image with vb.net barcode sdk
Building an Application
Visual Studio .NET gs1 barcode integratingwith .net
use .net vs 2010 ean 128 implementation toproduce ucc - 12 with .net
Depending on the application, these properties could be a lot of things ranging from data refresh intervals to the location of other external files. By standardizing on a format like this, you can write a class that is reusable in all your applications. Should the need ever arise to make a more complicated config file, you can subclass your Config class to handle the exceptions. This chapter looks at that later, but first let s focus on building the class itself.
Compose 2d barcode for .net
use vs .net crystal matrix barcode integrated todeploy matrix barcode in .net
Defining capability requirements
Denso QR Bar Code creation in .net
using .net framework tomake denso qr bar code on asp.net web,windows application
To begin, list the capabilities that you would like your Config class to have. You want the Config class to be pretty versatile, so aim for the following: Load an XML file and provide easy access to the data Dispatch an event once the external data has been loaded and is ready to be used Provide global accessibility throughout an application With your requirements defined, it s time to begin writing some code!
.net Vs 2010 Crystal ansi/aim itf 25 drawerin .net
using barcode writer for .net vs 2010 crystal control to generate, create 2 of 5 image in .net vs 2010 crystal applications.
Loading the XML
UCC.EAN - 128 barcode library on word
use word ucc-128 implementation todraw gs1 128 for word
The core functionality of your Config class revolves around loading XML data from an external document. There are two different approaches we could take to accomplish this: using File and FileStream or using URLLoader.
Ean13+5 printing on .net
use report rdlc ean13 creator tobuild ean-13 with .net
Using File and FileStream
Control ecc200 image for .net c#
generate, create gs1 datamatrix barcode none in visual c# projects
The AIR framework includes a package of useful classes for working with the local filesystem. Using a combination of the File and FileStream classes, you can load the text from the external XML document into your application and then parse it to become native XML as shown in Listing 15.2.
Barcode 3/9 encoder for .net c#
use .net winforms crystal bar code 39 encoder toencode code 3/9 with c#
LISTING 15.2 protected function loadXML(filePath:String):void { var file:File = File.applicationResourceDirectory. resolvePath(filePath); if(file.exists) { var fileStream:FileStream = new FileStream(); fileStream.open(file, FileMode.READ); var xmlData:String = fileStream.readUTFBytes(fileStream. bytesAvailable); fileStream.close(); _xml = new XML(xmlData); } }
Insert bar code on java
use ireport bar code integrating tocreate barcode for java
Building a Reusable Config Class
Control ean128 size for microsoft word
to connect ean / ucc - 14 and ean 128 barcode data, size, image with office word barcode sdk
This approach is fast and works great; however, you limit yourself to using it in a desktop application with this code. Given that a big part of AIR development is the power of reusing code between the Web and the desktop, a better solution might be to use URLLoader instead.
Assign datamatrix with excel spreadsheets
use excel spreadsheets data matrix ecc200 generator tomake data matrix 2d barcode on excel spreadsheets
NOTE
Linear implement for .net c#
use visual studio .net linear generating toinsert 1d for .net c#
In many cases, you sacrifice functionality when favoring reusability of code between the desktop and the Web. Be sure to carefully evaluate your options before settling on a solution for your application.
Using URLLoader
The URLLoader class is not limited to AIR development; you can use it in any ActionScript 3 (AS3) project. For that reason, it s worth considering in this situation given that your Config class would be equally handy in the development of a Web application, as shown in Listing 15.3.
LISTING 15.3 protected function loadXML(filePath:String):void { var loader:URLLoader = new URLLoader(); loader.addEventListener(Event.COMPLETE, onXMLLoadSuccess); loader.load(new URLRequest(filePath)); } protected function onXMLLoadSuccess(event:Event):void { _xml = new XML(URLLoader(event.target).data); }
Something else to consider is the fact that the URLLoader approach is asynchronous, whereas the File/FileStream approach is synchronous. This means that URLLoader begins loading the file and everything else moves on in the mean time. When the file is done loading, an event is dispatched. With the FileStream class, once you begin reading bytes, no other lines of code in the script are executed until the task is complete. This probably isn t a big deal unless the file you are loading is massive. Just food for thought. With these two options in mind, continue using the URLLoader class to manage the loading. Take a look at your Config class with the URLLoader in place in Listing 15.4. Thus far, your class has some basic functionality. An API is present for loading an XML file; if a file is not specified, a default file is used. Additionally, error handling is in place in case a file is not loaded successfully. Currently, the XML is being stored, but there is no way to access it outside of the class. In your capabilities definition, you wanted to serialize the XML data into class properties, making it nice and easy to use. The next section helps you accomplish that.