None of them. It's a really unfortunate development that so many schools are emphasizing 'design patterns' as if they're some of the most important concepts in all of computer science, churning out students who have been trained to t. What are the benefits of using design patterns in software development. If you see design patterns details in forums and articles and use them. It seems that the task can be achieved in a simpler w. What is Gang of Four (GOF)? In 1994, four authors Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides published a book titled Design Patterns - Elements of Reusable Object-Oriented Software which initiated the concept of Design Pattern in Software development. These authors are collectively known as Gang of Four (GOF). According to these.
The .NET Design Pattern Framework 4.5 comes with a unique reference app named Patterns in Action. It is built on a 4-tier pattern architecture using numerous design patterns and best practices.
Patterns in Action demonstrates, in great detail and with 100% source code, how to build a flexible multi-tier pattern-based architecture that supports any UI technology: ASP.NET MVC, WPF, and Windows Forms.
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Each UI communicates with the application via the exact same service tier (the Facade Pattern). You are getting 4 completely functional apps built on ASP.NET MVC, ASP.NET Web Forms, Windows Forms, and WPF.
See images of each UI platform below:
Did you notice the difference among these UIs? And yet, they are:
- Built on the exact same multi-tier pattern architecture,
- Consume the exact same Service layer, and
- Talk to the exact same database.
Quite remarkable!
So how does one build something like this? Below is an image of the Patterns in Action solution which shows the organization of the projects and the layers within the solution.
The red arrows show the 4 layers: presentation, service, business, and data (they are numbered 1 through 4).
The presentation layer itself supports 4 different UI platforms, one project for each. What is most interesting is that each UI accesses the same service, the same business, and the same data layers below.
The next diagram depicts the entire architectural stack:
The Presentation layer supports 4 different UI technologies, two of which are web applications that use the browser. To get to the database, each of the UIs needs to go through the other 3 layers starting with the Service layer and then down via the Business and Data layers all the way to the database.
Gang Of Four China
Delorme serial emulator windows 10. The Data layer offers 3 different providers to get to the database: ADO.NET, Linq to SQL, and Entity Framework. A web.config value determines which one is used. Swapping out data providers is made easy by using the DAO (Data Access Object) pattern.
Gang Of Four Design Patterns
Let's look at the patterns and practices used to build this solution. Here's an overview:
Gang Of Four Software Development Group
Gang Of Four Software Development Management
The yellow Convention over configuration box represents a best practice paradigm that is fundamental to the entire solution. Applying convention over configuration greatly simplifies the entire application stack making it easier and faster to build.
Next, we see numerous green boxes, each representing a design pattern, scattered throughout the solution. They come from 3 major pattern categories: Gang Of Four patterns, Fowler's Enterprise patterns, and the Model-View family of patterns. All are reviewed and discussed in depth in this package.