Home > Articles > Programming > Visual Studio

Programming Within the CSLA

Rocky Lhotka's Component-based Scalable Logical Architecture is a robust .NET development framework for creating powerful data-aware business objects that originate anywhere in the enterprise. Bob Reselman and Mark Gendein provide an overview of CSLA, its pros and cons, and a sample project demonstrating CSLA basics.
Like this article? We recommend

An architecture that can provide fully functional, data-aware objects that behave consistently regardless of network infrastructure and distributed environment is one of the ongoing dreams of programmers and application architects working in client/server settings. In many ways this dream has come true with the introduction of Component-based Scalable Logical Architecture (CSLA).

The CSLA framework created by Rockford (Rocky) Lhotka provides a business object architecture in which any object can be created and stored from anywhere, anytime—regardless of whether the consuming application is Windows Forms–based or web browser–based. In addition to consistent client behavior, CSLA works transparently with regard to back-end data access, whether the network protocol is based on web services, .NET Remoting, or .NET Enterprise Services. Lastly, the framework provides built-in functionality that alleviates many of the common chores of fundamental enterprise programming. For example, CSLA gives you an easy way to implement roles-based read/write access permissions to an object's property; to apply business rules validation; and to save data within a hierarchical parent-child relationship by saving the parent only.

This article shows you the conceptual basics of CSLA and illustrates them with some C# code examples. CSLA uses the factory design pattern extensively, so you'll come away with a firm operational understanding of the pattern. Finally, we'll discuss some of the strengths and weaknesses of CSLA.

We assume that you have at least intermediate knowledge of C# and have created distributed applications. If you've created a web-based .NET application using ADO.NET, you're in good shape. You should be familiar with object-oriented programming concepts such as abstract classes, method overriding, and the use of static fields and methods.

Consider the fundamental principle of CSLA—it is a framework for distributed programming that provides a set of base classes from which you derive business classes that are relevant to the needs of your application domain. These base classes allow derived objects to be constructed from anywhere within the enterprise network, and the mechanisms to get and save data from anywhere within the enterprise network. To get a clear, high-level appreciation of CSLA, you need to understand two core concepts. The first is the way that CSLA implements the factory design pattern. The second is the nature and use of the CSLA DataPortal.

Understanding CSLA and the Factory Pattern

CSLA uses the factory pattern to allow the framework to create very powerful business objects, so that much of an object's construction is hidden from the application programmer using the business object. With the factory pattern, you never new an object directly. Instead, you ask a factory for the object that you want and it is provided by way of a calling method in the factory object.

Mr. Lhotka uses a variation of the factory pattern in CSLA called class-in-charge. In this model, the object of interest itself is a factory, but constructed so that the factory's object constructors are declared private, and creation methods are declared as static and provide an instance of the object itself. Listing 1 and Figure 1 illustrate the concept behind the class-in-charge variation of the factory design pattern.

The code in Listing 1 is from the Music Catalog sample project that we created for this article (CogArtTechMusic.zip). This sample project shows you how CSLA uses the factory pattern to construct objects that know how to return instances of themselves. In addition, the sample code demonstrates the internals of CSLA data management. For the project code, along with installation notes and instructions, download the source file.

Listing 1 CSLA use of the factory pattern

/*****************************************
* Get an instance of a Catalog object by
* calling the static GetCatalog(string countryOfBand) 
* creation method. NOTE: The Catalog object contains a
* Bands property, which is a collection of Band objects. 
******************************************/
Catalog catalog = Catalog.GetCatalog("USA");
BandsList bands = catalog.Bands;
Figure 1

Figure 1 The factory design pattern allows you to provide a high degree of construction functionality, yet present a very simple interface to those using your CSLA business objects.

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

Overview


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information


To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information


Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children


This site is not directed to children under the age of 13.

Marketing


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information


If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information


Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020