pdf417 c# C HAPTE R 2 FRA MEWORK DES IGN in C#.NET

Printing PDF-417 2d barcode in C#.NET C HAPTE R 2 FRA MEWORK DES IGN

C HAPTE R 2 FRA MEWORK DES IGN
PDF417 Maker In Visual C#.NET
Using Barcode creation for .NET framework Control to generate, create PDF 417 image in .NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Recognizer In Visual C#.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Figure 2-13. Classes implementing the validation rules behavior A business object taps into this functionality through methods exposed on BusinessBase. The end result is that a business property is always coded in a consistent manner. In the following example, the highlighted line of code triggers the validation rules behavior: private static PropertyInfo<string> NameProperty = RegisterProperty<string>(new PropertyInfo<string>(typeof(Customer), "Name")); public string Name { get { return GetProperty<string>(NameProperty); } set { SetProperty<string>(NameProperty, value); } } Behind the scenes, the SetProperty() method calls a ValidationRules.CheckRules() method to trigger all rules associated with this property. You can call that method directly if you need to force rules to be checked at other times during the object s life cycle. You ll see more complete use of the validation rules functionality in 17, during the implementation of the sample application. There are three types of functionality displayed in Figure 2-13. The ValidationRules, RuleHandler, RuleArgs, and ValidationException classes manage the rule methods associated with the properties of an object. The BrokenRulesCollection and BrokenRule classes maintain a list of currently broken validation rules for an object. Finally, the CommonRules class implements a set of commonly used validation rules, such as StringRequired.
Draw UPC Symbol In Visual C#
Using Barcode creation for Visual Studio .NET Control to generate, create UPCA image in .NET framework applications.
www.OnBarcode.com
Painting Barcode In Visual C#
Using Barcode generation for VS .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Managing Rule Methods
2D Maker In C#
Using Barcode drawer for Visual Studio .NET Control to generate, create Matrix image in .NET applications.
www.OnBarcode.com
Draw Code128 In Visual C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create Code-128 image in .NET applications.
www.OnBarcode.com
Business rules are defined by a specific method signature as declared in the RuleHandler delegate: public delegate bool RuleHandler(object target, RuleArgs e);
Make PDF 417 In C#
Using Barcode maker for .NET framework Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
GS1 - 12 Maker In C#
Using Barcode maker for VS .NET Control to generate, create UPC-E image in .NET applications.
www.OnBarcode.com
CHAPTER 2 FRAMEWORK DE SIGN
PDF-417 2d Barcode Printer In VB.NET
Using Barcode generator for VS .NET Control to generate, create PDF 417 image in VS .NET applications.
www.OnBarcode.com
PDF 417 Encoder In Java
Using Barcode creation for Android Control to generate, create PDF 417 image in Android applications.
www.OnBarcode.com
There are also two generic variations on this signature: public delegate bool RuleHandler<T>(T target, RuleArgs e); public delegate bool RuleHandler<T, R>(T target, R e); Each business object contains an instance of the ValidationRules object, which in turn maintains a list of rules for each property in the business object. Within ValidationRules there is an optimized data structure that is used to efficiently store and access a list of rules for each property. This allows the business object to request that validation rules for a specific property be executed, or that all rules for all properties be executed. Each rule method returns a Boolean value to indicate whether the rule is satisfied. If a rule is broken, it returns false. A RuleArgs object is passed to each rule method. This object includes a Description property that the rule can set to describe the nature of a broken rule. As ValidationRules executes each rule method, it watches for a response. When it gets a negative response, it adds an item to the BrokenRulesCollection for the business object. On the other hand, a positive response causes removal of any corresponding item in BrokenRulesCollection. Finally, there s the ValidationException class. A ValidationException is not thrown when a rule is broken, since the broken rule is already recorded in BrokenRulesCollection. Instead, ValidationException is thrown by BusinessBase itself in the case that there s an attempt to save the object to the database when it s in an invalid state.
Paint GTIN - 12 In Java
Using Barcode creator for Android Control to generate, create UPCA image in Android applications.
www.OnBarcode.com
Read Barcode In Visual Studio .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
www.OnBarcode.com
Maintaining a List of Broken Rules
Scanning Barcode In Visual C#.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in VS .NET applications.
www.OnBarcode.com
Painting Code 128 In .NET Framework
Using Barcode drawer for ASP.NET Control to generate, create Code 128 Code Set A image in ASP.NET applications.
www.OnBarcode.com
The ValidationRules object maintains a list of rule methods associated with an object. It also executes those methods to check the rules, either for a specific property or for all properties. The end result of that process is that descriptions for broken rules are recorded into the BrokenRulesCollection associated with the business object. The BrokenRulesCollection is a list of BrokenRule objects. Each BrokenRule object represents a validation rule that is currently broken by the data in the business object. These BrokenRule objects are added and removed from the collection by ValidationRules as part of its normal processing. The BusinessBase class uses its BrokenRulesCollection to implement an IsValid property. IsValid returns true only if BrokenRulesCollection contains no items. If it does contain items, the object is in an invalid state. The primary point of interest with the BusinessRulesCollection is that it is designed to not only maintain a list of current broken rules but also to provide read-only access to the UI. This is the reason for implementing a specialized collection object that can change its own data but is seen by the UI as being read-only. On top of that, the base class implements support for data binding so that the UI can display a list of broken rule descriptions to the user by simply binding the collection to a list or grid control. Additionally, the implementation of IDataErrorInfo makes use of the BrokenRulesCollection to return error text for the object or for individual properties. Supporting this interface allows WPF data binding and the Windows Forms DataGridView and ErrorProvider controls to automatically display validation error text to the user.
EAN13 Creator In VS .NET
Using Barcode drawer for Reporting Service Control to generate, create EAN-13 Supplement 5 image in Reporting Service applications.
www.OnBarcode.com
UPC - 13 Printer In None
Using Barcode maker for Office Excel Control to generate, create EAN-13 image in Microsoft Excel applications.
www.OnBarcode.com
Recognize Barcode In VB.NET
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET applications.
www.OnBarcode.com
Print Denso QR Bar Code In None
Using Barcode printer for Online Control to generate, create QR Code JIS X 0510 image in Online applications.
www.OnBarcode.com
UCC - 12 Creation In Objective-C
Using Barcode maker for iPad Control to generate, create UPC Symbol image in iPad applications.
www.OnBarcode.com
Drawing UCC.EAN - 128 In Java
Using Barcode encoder for Java Control to generate, create GS1 128 image in Java applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.