free pdf417 generator c# AcceptChanges in Visual C#

Encoding PDF 417 in Visual C# AcceptChanges

AcceptChanges
PDF-417 2d Barcode Creator In C#.NET
Using Barcode printer for VS .NET Control to generate, create PDF417 image in VS .NET applications.
www.OnBarcode.com
Recognizing PDF417 In Visual C#.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
AcceptChanges() is actually the simplest of the three methods. If changes are being accepted, it means that the current values in the object are the ones that should be kept, and the most recent snapshot is now meaningless and can be discarded. Like CopyState(), once this method is complete, a virtual AcceptChangesComplete() method is called to allow subclasses to take additional actions. In concept, this means that all AcceptChanges() needs to do is discard the most recent snapshot: _stateStack.Pop(); However, it is important to remember that the object may have child objects, and they need to know to accept changes as well. This requires looping through the object s fields to find any child objects that implement Csla.Core.IUndoableObject. The AcceptChanges() method call must be cascaded to them too. The process of looping through the fields of the object is the same as in CopyState() and UndoChanges(). The only difference is where the method call is cascaded: // the field is undoable so see if it is a child object if (typeof(Csla.Core.IUndoableObject). IsAssignableFrom(field.FieldType)) { object value = field.GetValue(this); // make sure the variable has a value if (value != null) { // it is a child object so cascade the call ((Core.IUndoableObject)value).AcceptChanges(); } } Simple field values don t need any processing. Remember that the idea is that the current values have been accepted so there s no need to change those current values at all.
Data Matrix 2d Barcode Creator In Visual C#.NET
Using Barcode drawer for .NET framework Control to generate, create Data Matrix ECC200 image in VS .NET applications.
www.OnBarcode.com
Printing 2D Barcode In C#.NET
Using Barcode encoder for .NET Control to generate, create Matrix 2D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
BusinessBase Class
Paint Barcode In C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
UPC Code Maker In C#.NET
Using Barcode drawer for .NET Control to generate, create UPC A image in .NET framework applications.
www.OnBarcode.com
The next class listed in Table 3-1 is Csla.Core.BusinessBase. This class will implement most of the functionality for a single editable object, and combines the n-level undo, validation rules, and
Making Barcode In Visual C#.NET
Using Barcode maker for .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Printing MSI Plessey In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create MSI Plessey image in .NET framework applications.
www.OnBarcode.com
CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
PDF-417 2d Barcode Printer In None
Using Barcode creation for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
Encode PDF417 In None
Using Barcode encoder for Software Control to generate, create PDF417 image in Software applications.
www.OnBarcode.com
authorization rules, along with some data binding support. Given that the validation and authorization classes are later in the chapter, you may need to look forward in the chapter to see the full implementation of each feature. Like all base classes, this class must be serializable and abstract. It inherits from UndoableBase (and therefore also from BindableBase): namespace Csla.Core { [Serializable()] public abstract class BusinessBase : Csla.Core.UndoableBase, System.ComponentModel.IEditableObject, System.ComponentModel.IDataErrorInfo, ICloneable } Not only does this class inherit from UndoableBase, but it also implements System. ComponentModel.IEditableObject and System.ComponentModel.IDataErrorInfo to provide data binding support. It also implements System.ICloneable, and so the object will have a Clone() method. This class pulls together a lot of functionality. The goal is to abstract all this functionality into a set of easily understood behaviors that simplify the creation of business objects. Table 3-3 lists the functional areas. Table 3-3. Functional Areas Implemented in Csla.Core.BusinessBase
Recognize PDF-417 2d Barcode In .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Scanner In VS .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Functional Area
Barcode Scanner In Visual C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Decoding Code 3/9 In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Tracking object status N-level undo
EAN13 Creation In None
Using Barcode encoder for Excel Control to generate, create GS1 - 13 image in Microsoft Excel applications.
www.OnBarcode.com
Code-128 Creator In Objective-C
Using Barcode creation for iPad Control to generate, create Code 128C image in iPad applications.
www.OnBarcode.com
Description
Make Barcode In Objective-C
Using Barcode encoder for iPad Control to generate, create Barcode image in iPad applications.
www.OnBarcode.com
Encode PDF417 In Java
Using Barcode creator for Java Control to generate, create PDF-417 2d barcode image in Java applications.
www.OnBarcode.com
Keeps track of whether the object is new, old, dirty, clean, or marked for deletion Provides access to the underlying n-level undo functionality implemented in UndoableBase, and implements the IEditableObject interface Implement behaviors so the object can function as either a stand-alone object, a parent object, or a child of another object or collection Provide abstract access to the validation rules behavior (discussed later in the chapter) and implement the IDataErrorInfo interface Provide abstract access to the authorization rules behavior (discussed later in the chapter) Implements the ICloneable interface
Code-128 Recognizer In Visual C#
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Code 3/9 Generator In VS .NET
Using Barcode maker for VS .NET Control to generate, create Code 39 image in Visual Studio .NET applications.
www.OnBarcode.com
Root, parent, and child behaviors
Validation rules
Authorization rules Cloning
s Tip
Of course, there will also be code in BusinessBase to support data access a topic discussed in 4. In this chapter, the focus is on the behaviors that support the creation of the user interface and the implementation of non-data access business logic.
Tracking Object Status
All editable business objects should keep track of whether the object has just been created, whether its data has been changed, or whether it has been marked for deletion. Using the validation rules functionality, the object can also keep track of whether it s valid. Table 3-4 lists the object status properties in BusinessBase.
Copyright © OnBarcode.com . All rights reserved.