.net qr code generator Business and Validation Rules in VB.NET

Creator QR Code in VB.NET Business and Validation Rules

Business and Validation Rules
QR Code 2d Barcode Generation In VB.NET
Using Barcode maker for .NET framework Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
www.OnBarcode.com
Decode Denso QR Bar Code In VB.NET
Using Barcode decoder for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
ve now walked through several aspects of the CSLA .NET implementation, including an overview of the framework, base classes, property declarations, object status management, parent-child relationships, and data binding. This chapter will focus on how CSLA .NET supports business and validation rules in a standardized manner. In several previous chapters, I ve made reference to the framework s support for business and validation rules. The rules are invoked when a property is set on an editable business object through the SetProperty() helper method. The business developer can also invoke the rules by explicitly calling the CheckRules() method of the ValidationRules object. As validation rules are broken and unbroken, they are added to and removed from a list of broken rules. Each editable business object always has a list of the currently broken rules. If this list is empty, IsSelfValid is True; otherwise, it is False. Not only is the list used to drive the IsSelfValid property, but it is also used by the IDataErrorInfo implementation for data binding support. The list of broken rules is exposed as a property from the business object, so the list itself can be data bound and displayed to the end user if desired. The CSLA .NET framework includes the infrastructure necessary to associate business and validation rules with properties and to invoke those rules at appropriate points in the object s life cycle. That is the focus of this chapter.
Encoding PDF417 In Visual Basic .NET
Using Barcode maker for Visual Studio .NET Control to generate, create PDF417 image in Visual Studio .NET applications.
www.OnBarcode.com
Print 1D In VB.NET
Using Barcode maker for .NET framework Control to generate, create Linear image in VS .NET applications.
www.OnBarcode.com
Types of Rules
Draw QR Code In VB.NET
Using Barcode drawer for .NET framework Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
www.OnBarcode.com
Barcode Creation In VB.NET
Using Barcode drawer for .NET framework Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
In the CSLA .NET model, business and validation rules are implemented as methods. Each rule is contained in its own method. Rules are then associated with properties of business objects. The BusinessBase class includes code to invoke these rules at appropriate points in the object s lifetime. For example, rules for a property are invoked when that property is changed or when a dependent property is changed. They are also invoked when a new instance of the object is created, and they can be invoked explicitly by your code. Normally, rules are associated with business objects on a per-type basis. This means that all instances of a specific business object type (such as CustomerEdit) will have the same rules associated with the same properties. This is a good thing, because it means that the work of associating the rules to properties is done once for that type, and the information is reused across all instances of the type. That saves both processing time and memory. As an alternative, it is also possible to associate rules with a business object on a per-instance basis. This means that each instance of the business object has its own rules. The associations are set up as the object instance is created, and they are stored in memory for that specific object. Obviously, this can cause performance and memory-consumption issues if you have many instances of a type, so you should avoid this approach as a general rule. CSLA .NET supports this concept, because there are rare cases when rules must vary on a per-instance basis.
Barcode Encoder In VB.NET
Using Barcode drawer for .NET framework Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Code 2 Of 7 Generation In Visual Basic .NET
Using Barcode creation for .NET framework Control to generate, create USS Codabar image in .NET framework applications.
www.OnBarcode.com
CHAPTER 11 BUS IN ESS AN D V ALIDA TION RULES
Denso QR Bar Code Generator In .NET Framework
Using Barcode creator for VS .NET Control to generate, create QR Code 2d barcode image in .NET applications.
www.OnBarcode.com
Painting QR Code In Objective-C
Using Barcode creation for iPhone Control to generate, create QR Code JIS X 0510 image in iPhone applications.
www.OnBarcode.com
Per-type rules must be accessible to all instances of the business object type. Normally, per-type rule methods are Shared, so they are always available to any object instance. It is also possible to implement per-type rule methods as instance methods of a global Singleton object, though this is a more complex technique and offers no clear benefit over the simpler Shared method approach. In this book, I implement Shared rule methods and recommend that approach. Per-instance rule methods need to be accessible only to the specific object instance where they are used. Normally, they are implemented as Private instance methods in the business class, although they can also be Shared methods. I won t use any per-instance rules in this book, and I recommend against their use. Given this basic background on per-type and per-instance rule methods, I ll now discuss the business and validation subsystem in CSLA .NET, starting with a deeper exploration of rule methods and how you implement them.
GS1-128 Generation In None
Using Barcode generation for Office Word Control to generate, create EAN128 image in Microsoft Word applications.
www.OnBarcode.com
QR Code JIS X 0510 Creation In Java
Using Barcode generation for Android Control to generate, create Quick Response Code image in Android applications.
www.OnBarcode.com
QR Code Drawer In .NET
Using Barcode maker for .NET framework Control to generate, create QR Code JIS X 0510 image in Visual Studio .NET applications.
www.OnBarcode.com
European Article Number 13 Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Make Barcode In Java
Using Barcode generator for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Making Barcode In VS .NET
Using Barcode creation for Reporting Service Control to generate, create Barcode image in Reporting Service applications.
www.OnBarcode.com
PDF 417 Creator In Visual Studio .NET
Using Barcode drawer for Reporting Service Control to generate, create PDF417 image in Reporting Service applications.
www.OnBarcode.com
Barcode Creation In None
Using Barcode creation for Online Control to generate, create Barcode image in Online applications.
www.OnBarcode.com
Code 39 Extended Printer In Java
Using Barcode encoder for Android Control to generate, create USS Code 39 image in Android applications.
www.OnBarcode.com
Recognize Code 39 Extended In VS .NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.