pdf417 barcode generator c# Note in C#

Encoder PDF-417 2d barcode in C# Note

Note
Encode PDF 417 In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
PDF-417 2d Barcode Recognizer In Visual C#
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
In many CSLA .NET applications, the data access code is directly embedded within the business object. While this arguably blurs the boundary between layers, it often provides the best performance and the simplest code.
Generating PDF-417 2d Barcode In C#.NET
Using Barcode maker for VS .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
Creating Barcode In Visual C#
Using Barcode creation for VS .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
The examples in this book use a formal data access layer created using LINQ to SQL, but the same architecture supports creation of a DAL that uses raw ADO.NET or many other data access technologies.
2D Barcode Encoder In Visual C#
Using Barcode generator for .NET Control to generate, create 2D image in .NET applications.
www.OnBarcode.com
Code 128A Creator In Visual C#.NET
Using Barcode creator for .NET framework Control to generate, create Code 128 Code Set B image in .NET applications.
www.OnBarcode.com
Supporting Physical N-Tier Models
Generating QR Code ISO/IEC18004 In Visual C#
Using Barcode creator for .NET framework Control to generate, create Quick Response Code image in Visual Studio .NET applications.
www.OnBarcode.com
ANSI/AIM ITF 25 Printer In Visual C#.NET
Using Barcode maker for VS .NET Control to generate, create ANSI/AIM ITF 25 image in .NET framework applications.
www.OnBarcode.com
The question that remains then is how to support physical n-tier models if the UI-oriented and dataoriented behaviors reside in one object. UI-oriented behaviors almost always involve a lot of properties and methods, with a very finegrained interface with which the UI can interact in order to set, retrieve, and manipulate the values of an object. Almost by definition, this type of object must run in the same process as the UI code itself, either on the Windows client machine with WPF or Windows Forms or on the web server with Web Forms.
PDF417 Printer In None
Using Barcode creator for Word Control to generate, create PDF 417 image in Office Word applications.
www.OnBarcode.com
PDF417 Printer In VB.NET
Using Barcode maker for .NET Control to generate, create PDF417 image in .NET applications.
www.OnBarcode.com
C HAPTE R 2 FRA MEWORK DES IGN
Read ECC200 In Visual C#.NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
QR Printer In Objective-C
Using Barcode encoder for iPhone Control to generate, create Denso QR Bar Code image in iPhone applications.
www.OnBarcode.com
Conversely, data-oriented behaviors typically involve very few methods: create, fetch, update, delete. They must run on a machine where they can establish a physical connection to the data store. Sometimes this is the client workstation or web server, but often it means running on a physically separate application server. This point of apparent conflict is where the concept of mobile objects enters the picture. It s possible to pass a business object from an application server to the client machine, work with the object, and then pass the object back to the application server so that it can store its data in the database. To do this, there needs to be some black-box component running as a service on the application server with which the client can interact. This black-box component does little more than accept the object from the client and then call methods on the object to retrieve or update data as required. But the object itself does all the real work. Figure 2-9 illustrates this concept, showing how the same physical business object can be passed from application server to client, and vice versa, via a generic router object that s running on the application server. In 1, I discussed anchored and mobile objects. In this model, the business object is mobile, meaning that it can be passed around the network by value. The router object is anchored, meaning that it will always run on the machine where it s created. In the framework, I ll refer to this router object as a data portal. It will act as a portal for all data access for all the objects. The objects will interact with this portal in order to retrieve default values (create), fetch data (read), update or insert data (update), and remove data (delete). This means that the data portal will provide a standardized mechanism by which objects can perform all create, read, update, delete (CRUD) operations. The end result will be that each business class will include a factory method that the UI can call in order to load an object based on data from the database, as follows: public static Customer GetCustomer(string customerId) { return DataPortal.Fetch<Customer>( new SingleCriteria<Customer, string>(customerId)); }
Barcode Drawer In .NET
Using Barcode drawer for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
GTIN - 128 Creation In VS .NET
Using Barcode maker for .NET framework Control to generate, create USS-128 image in Visual Studio .NET applications.
www.OnBarcode.com
Figure 2-9. Passing a business object to and from the application server
Code 3/9 Generator In None
Using Barcode generator for Office Excel Control to generate, create ANSI/AIM Code 39 image in Excel applications.
www.OnBarcode.com
Encoding Data Matrix In VS .NET
Using Barcode maker for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
www.OnBarcode.com
CHAPTER 2 FRAMEWORK DE SIGN
Reading ANSI/AIM Code 128 In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
GS1 - 13 Generation In None
Using Barcode creation for Microsoft Excel Control to generate, create EAN / UCC - 13 image in Office Excel applications.
www.OnBarcode.com
Notice how the data portal concept abstracts the use of WCF, and so this code is far simpler than the WCF code used earlier in the chapter. The actual data access code will be contained within each of the business objects. The data portal will simply provide an anchored object on a machine with access to the database server and will invoke the appropriate CRUD methods on the business objects themselves. This means that the business object will also implement a method that will be called by the data portal to actually load the data. That method will look something like this: private void DataPortal_Fetch(SingleCriteria<Customer, string> criteria) { // Code to load the object's fields with data goes here } The UI won t know (or need to know) how any of this works, so in order to create a Customer object, the UI will simply write code along these lines: var cust = Customer.GetCustomer("ABC"); The framework, and specifically the data portal, will take care of all the rest of the work, including figuring out whether the data access code should run on the client workstation or on an application server. Using the data portal means that all the logic remains encapsulated within the business objects, while physical n-tier configurations are easily supported. Better still, by implementing the data portal correctly, you can switch between having the data access code running on the client machine and placing it on a separate application server just by changing a configuration file setting. The ability to change between 2- and 3-tier physical configurations with no changes to code is a powerful and valuable feature.
Create Code 128B In Java
Using Barcode generator for Java Control to generate, create Code 128 Code Set B image in Java applications.
www.OnBarcode.com
Painting DataMatrix In None
Using Barcode drawer for Software Control to generate, create Data Matrix image in Software applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.