Finally! An easy-to-follow Guide for .NET 3.5 Architects
building Applications with Design Patterns
Design Pattern FrameworkTM 3.5
Includes
Gang of Four ,
Enterprise and
SOA patterns.
New in Release 3.5:
WPF ,
WCF ,
LINQ ,
Business Rules ,
Membership ,
Cloud Facade ,
MVC ,
MVP , and
MVVM patterns & practices!
Now in two editions: C# and VB.NET!
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Attention:
If you need complete confidence working with design patterns in .NET 3.5,
then this unique Design Pattern Framework is the thing for you.
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Here's an unsolicited letter from Yama Kamyar in California -- just one
of the many .NET developers now benefiting from the Design Pattern Framework.
Hi,
I would just like to take a minute of my time to let you know the
design pattern package for both C# and VB.NET you have offered for ONLY
$99.00 were the BEST transaction I have ever done in my career.
It is far better than buying a 600 page book and spend a 100 years learning from
it. Your package
has immediately been effective for both my business and
my career from the moment I opened it.
I love you guys!
Yama Kamyar
Yamabiz, Inc.
San Diego, California
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.NET Author
and San Diego
.NET User Group
Presenter
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And here is another unsolicited letter from Miguel A. Castro. He's a
Microsoft MVP (Most Valuable Professional for C#/ASP.NET), a well-known .NET author,
and a member of the International .NET Association (INETA) speaker bureau.
Hello,
Quite a package you guys put together there - code and docs. You've managed to compile for me what I've been grabbing from
various sources over a long time.
I'm very impressed.
I am already a customer and I hope you have tremendous success
with this. Keep up the good work!
 |
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Miguel A. Castro, President
Infotek Consulting Group, Inc.
New Jersey, USA
www.infotekcg.com
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Two editions: C# and VB.NET
Is your preferred language C# or VB.NET? In fact, it does not matter because the
Design Pattern Framework comes in two editions: C# and VB.NET.
Their contents are the same -- each with
source code in their own language: the C# edition comes with
100% pure C# source code and
the VB.NET edition comes with 100% pure VB.NET source code.
What do I get with the Design Pattern FrameworkTM?
In fact, our latest Design Pattern Framework 3.5 is 7 packages in one --
each filled with information and source code you will not find anywhere else --
and each working together to empower your applications and your career. They are:
| 1. | 69 Comprehensive .NET 3.5 Design Pattern Projects |
| 2. | 23 Valuable UML Diagrams in Visio format |
| 3. | Printable PDF document with all GoF Patterns |
| 4. | 3-Tier Pattern Architecture with WPF, WCF, & LINQ |
| 5. | E-commerce ASP.NET 3.5 Pattern Application with MVC! |
| 6. | E-commerce Windows Forms Application with MVP! |
| 7. | E-commerce WPF Reference Application with MVVM! |
Design Pattern Framework 3.5, our latest release, has been enhanced significantly with brand new
insights on how to build a 3-tier .NET pattern architecture based on the .NET 3.5 platform.
These include Patterns and Practices for
WCF, WPF, LINQ, LINQ-TO-SQL, and Model-View patterns including MVC, MVP, and MVVM.
Also new in this release are Cloud Facade, Business Rules, and Membership.
Let's look at each of the 7 packages in more detail.
1. 69 Comprehensive Gang of Four .NET 3.5 Design Pattern Projects
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Have you ever wondered how useful it would be to have dozens of
design pattern source code projects available at your fingertips? Yes, Google
is just a few clicks away, but Google results require you to wade through numerous
result pages before you may find your answer -- mostly without meaningful or useful sample code.
Not so with the 69 ready-to-run Design Pattern projects. Well organized in a
single Visual Studio .NET solution, you have the following code available at your fingertips.
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- 23 Structural Gang of Four design patterns
- 23 Real-World Gang of Four design patterns
- 23 .NET 3.5-Optimized Gang of Four design patterns
A total of 69 design pattern projects -- each clearly named and within easy reach.
How easy? Simply create a shortcut to our master .NET Solution on your desktop
and you're ready to explore all 69 elegant software solutions.
And, of course, every project comes with 100% pure source code!
Your desktop shortcut(s) will look like this:
Design Pattern shortcuts:
Double click the shortcut and all 69 pattern projects are instantly available:
Design Pattern Solution Explorer:
100% pure source code for the best learning experience:
Visual Studio .NET code editor:
2. 23 Valuable UML Diagrams in Visio format
Many of you have asked about the Visio templates for the UML diagrams
of the 23 Gang of Four Patterns. We're pleased to inform you that these are
now included in the Design Pattern Framework!
23 Visio templates in all: one for each of the Gang of Four patterns.
Use these while you study design patterns or when discussing
patterns with your colleagues. Or perhaps you want UML
printouts of commonly used patterns on your office wall.
Whatever your need, you have all UML diagrams available in a format you can
work with.
23 Design Pattern UML Diagrams in Visio:
3. Printable PDF document with all 23 GoF Patterns
Many developers have requested that the design pattern details
be made available in some printable format. We're happy to let you know that
with the Design Pattern Framework you're getting a printable PDF
pattern reference guide.
In this 88-page document you will find important details on each of the
the 23 GoF patterns: definition, frequency of use, UML diagram, and
participating classes. This document goes hand in hand with the
aforementioned 69 design pattern projects. A very powerful combination indeed.
It is one thing to understand design patterns. It's an entirely different thing
to understand exactly when and where you apply these patterns.
Books on design patterns mostly explain the mechanics of the patterns rather than
their usage. We are pleased to announce that this PDF document provides you with this
hard-to-find information.
Each of the 23 patterns includes:
1) when and where in .NET do you apply the design pattern, and
2) where does Microsoft use design patterns in its own .NET Framework.
This information, in combination with so much useful source code, is not
available anywhere else.
Printable PDF Design Pattern Document
4. 3-Tier Pattern Architecture with WCF, WPF, LINQ
Included in the Design Pattern Framework 3.5 is an unique e-commerce reference application
named Patterns in Action. It is built on a 3-tier pattern architecture
using advanced design patterns that are developed on .NET 3.5
including WPF, WCF, and LINQ.
Patterns in Action shows in great detail (100% source code)
how to build a robust 3-tier pattern architecture that supports any UI platform
(i.e. the Presentation tier).
Each UI communicates with the application via the exact same WCF services
(the Cloud Facade Pattern). You will receive 3 completely functional
applications with these UIs: ASP.NET, Windows Forms, and WPF.
See screenshots below.
ASP.NET Presentation Tier
Windows Forms Presentation Tier
An amazing WPF Presentation Tier
Did you notice how different these applications are? Yet, they are:
- Built on the exact same 3-tier pattern architecture,
- Consume the exact same WCF services, and
- Use the exact same database.
Quite remarkable!
So what exactly is 'Patterns in Action' ?
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Patterns in Action is a real-world, e-commerce
3.5 .NET reference application that clearly demonstrates
when, where, and how design patterns are applied in
today's modern application design.
Of course it comes with 100% source code -- absolutely nothing is
hidden.
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Patterns in Action includes features that are common
to modern e-commerce application. For example, users can
browse a product catalog, view products and product details,
add items to a shopping cart, remove items from a shopping cart,
change quantities, calculate and recalculate subtotals and totals.
Also included is an administrative module from which the administrator
manages customer data and reports on customer orders with all order details.
In fact, Patterns in Action contains code
that is valuable beyond the realm of e-commerce applications.
Examples include: a
hierarchical menu system, an error logging facility, encryption routines,
business rules engine, and a system of a highly configurable data access objects (DAOs).
Below is an overview with screenshots for each of the 3 UI platforms.
5. E-commerce ASP.NET Pattern Framework
Here are some additional screenshots of the ASP.NET e-commerce application built on the 3-Tier Pattern Architecture.
This application uses a basic MVC (Model View Controller) design pattern.
Remember, Design Pattern Framework 3.5 comes with 100% source code for a rich and rewarding learning experience.
.NET developers who purchased our product tell us they use techniques
from this reference application everyday in their own projects.
Login to the WCF Service
Product Catalog and Product List
Product Details / Add to Cart
E-commerce Shopping Cart
Customer Maintenance
Order and Order Details
6. E-commerce Windows Forms Application
Here are some screenshots of the Windows Forms application built on the 3-Tier Pattern Architecture.
This application is built using the MVP (Model View Presenter) design pattern.
Design Pattern Framework 3.5 comes with 100% source code for an optimal learning experience.
If you're building Windows Forms applications you will gain great confidence
in applying design patterns and best practices in your own .NET projects.
Login to WCF Service
Customer List with Orders and Order Details
Manage Customers with Add, Edit, Delete Functionality
Edit Existing Customer Record
7. E-commerce WPF Reference Application
Here are some screenshots of the WPF application built on the 3-Tier Pattern Architecture.
This application is built using the MVVM (Model View ViewModel) design pattern.
Remember, all details on how this WPF application was built are available to you:
the package comes with 100% source code.
If you are exploring WPF you'll want to avoid early missteps and
the Design Pattern Framework 3.5 is a
must-have resource that will
guide you in the right direction.
Unfortunately, these screenshots do not show you the animation effects,
including glowing menus and customer items that expand with mouse-overs.
Login to the WCF Service
List of Customers with Images
Manage Customers with Add, Edit, Delete Functionality
Edit Existing Customer Record
View Customer Order and Order Details History
The Design Pattern Framework is very, very popular
Indeed, thousands of .NET architects and .NET developers have come to rely on
the Design Pattern Framework. Why, you ask? We'll get to that, but
as a lead-in, let's examine the value of 100% source code and why we are #1.
As a .NET developer you know the value of having access to
real-world source code written by expert developers.
You study the code, internalize the best ideas,
and then apply these to your own work.
Exploring master-crafted source code is the most effective way
to become confident and
productive in applying patterns to your own work.
How do we know?
- We are professional developers, architects and MCSDs ourselves -- and
we know how we got there.
- We train developers on using design patterns.
So we know the most effective way to learn about patterns.
- Finally, our website has offered design pattern source code
for several years now. Every day, we get thousands of developers
like you who come here to get the necessary information
that will make them succeed in their work and their career.
Developers need source code!
Here's some proof that we are the #1 Design Pattern site on the Internet!
Our website offers free C# source code samples
for the Gang of Four Design Patterns, but the question .NET developers kept on asking is:
- where do you find real-world applications that
show how, when,
and where design patterns are really applied? (our answer is below...).
You won't find it in pattern books. Most explain patterns with code samples that
include objects with names like Foo, Bar, and Demo -- not objects
that are relevant to your application domain.
You won't find it on the Internet either. Nobody in his right mind is going to
publish the source code of their successfully architected application on the Web.
Clearly, you're in a catch-22 situation when it comes to finding
the real-world sources you need to succeed.
Our Answer
Our answer to this dilemma is the Design Pattern Framework 3.5; a unique product that is
not available anywhere else. It is exactly what .NET developers have been waiting for:
detailed explanations and code samples of design patterns -- from basic to advanced;
great documentation (e-books, reference guides, UML models, and more);
and, to top it off, 3 real-world applications (ASP.NET, WinForms, WPF)
all built on a single 3-tier
pattern architecture using .NET 3.5 with WCF, WPF, and LINQ.
So there you have it. This explains why thousands of .NET architects and .NET developers
have come to rely on the Design Pattern Framework in their daily .NET project work.
This unique resource has been architected from the ground up using
the most relevant and up-to-date Design Patterns.
It offers a unique glimpse into the world of modern application architecture
in which Design Patterns play an integral role.
Furthermore, everything in this package
is open for inspection and comes with 100% pure source code!
Our e-commerce pattern application, which is part of the Design Pattern Framework 3.5,
is named Patterns in Action.
As its name implies, there is nothing theoretical here -- it's a
real-world .NET 3.5 solution with Design Pattern implementations at
key locations: exactly the way expert architects are building their own
high-performance .NET 3.5 business applications.
.NET 3.5, WCF, WPF, and LINQ
With the release of .NET 3.5, Microsoft introduced several
new technologies, including WPF, WCF, and LINQ.
As a .NET developer you know it takes time and effort to study and
internalize these new platforms.
And, it takes even more time before you are confident in applying and
integrating these into your own projects.
Design Pattern Framework 3.5 is designed to shorten the learning curve for these platforms.
It includes a comprehensive set of proven pattern and practices that are
presented in the form of real-world code (built on WCF, WPF, LINQ) in our
Patterns in Action reference application. With this resource on your side
you will become confident and productive quickly and effectively.
It's like learning to walk: you fall and get up many times.
Patterns in Action shortens
this process and soon you'll be running like a pro
making great strides in your new .NET 3.5 pattern lifestyle!
Using patterns to build a robust 3-tier architecture
Many .NET applications do not benefit from a robust
3-tier architecture. They are built on a simple 2-tier client/server model
in which all code (UI, business logic, and data access) is placed at
one location: the code behind pages.
Indeed, the initial development cycle may be shorter, but in the long run you'll find
that these applications do not evolve easily with changing business needs.
They are hard to maintain, nearly impossible to change, difficult to integrate
(expose as a Web Services for example),
and they do not scale very well (for when your website becomes an instant success!).
You may be wondering, how do I build a pattern-based, 3-tier application?
We're glad you asked. Here is how it's done in Patterns in Action:
3-tier application model:
In a 3-tier model each tier corresponds directly to one of the three elements
needed in an architecture: interaction, manipulation, and storage. The three
tiers or layers are:
- Presentation layer — handles external interaction with the user
- Business layer — manipulates the information required by the user
- Database layer — stores the data handled by the system
Now, 3-tier architectures are widely accepted as a high-level best
practice approach. However, a few details need to be resolved. For example,
how is each tier built and and how do the tiers communicate with each other?
Below is a cross-section that shows some of the technologies used and
the communication
between the layers. Notice the prominent role that WCF plays. It is
a single point of entry (Cloud Facade Pattern)
into the application services.
The right-hand-side shows some of the key design patterns
used in the reference application. Clearly, patterns
play an integral role throughout the entire 3-tier architecture.
3-tier cross-section:
Here are some details on the tiers and their relationships:
The PL: The concern of the Presentation Layer (PL) is to present information in a consistent
and easy-to-understand manner to the end-user. Patterns in Action includes fully functional
implementations of three UI platforms: ASP.NET, Windows Forms and WPF (Windows Presentation Foundation).
From PL to WCF: Each of the 3 UI platforms consume the exact same services
hosted under WCF. This service-oriented
model is an implementation of the Cloud Facade Design Pattern.
Applications designed this way have the ability to expose their Services (Web or otherwise) with no
extra work (other than configuring the WCF host). WCF is truly a powerful new platform!
From WCF to BL:
The WCF Service Layer receives messages from the PL.
It interprets the message, unpacks the Data Transfer Objects,
and orchestrates and coordinates the interaction between
Business Objects and Data Access Objects.
The Services Layer is also the place where authorization, authentication,
data validation, and database transactions are implemented.
The BL: In the Business Layer (BL) you'll
find Business objects, such as, Product,
Customer, and Order. Business Objects encapsulate business logic
in the form of business rules. Business Objects themselves have
no knowledge about databases or data persistence, which is handled by the DL.
From BL to DL: In fact, Business Objects do not
directly interact with the
Data Layer (DL).You don't ask a Product business object to save
itself and there are no Save or Load methods on the Business Objects
themselves.
Instead, persistence is handled by dedicated Data Access Objects (another
Enterprise Pattern) that extract
data from the Business Objects and subsequently store it in the database.
The DL: The Data Layer (DL) handles the persistence of Business Objects.
Patterns in Action offers two different technologies: ADO.NET and LINQ-to-SQL.
In web.config you indicate which one to use.
ADO.NET implements a 'data provider factory' which uses an
abstract factory pattern and returns database specific singleton factories.
This example shows that design patterns frequently work together with other patterns.
When using LINQ-to-SQL you will see that LINQ generated Entities are mapped
to Business Objects.
Even if you do not purchase the Design Pattern FrameworkTM we'd like you to
walk away with the following important observation:
Have you noticed that there are no
direct interactions between the PL and the BL or DL?
In other words, the UI only interacts with the application via the WCF Service Layer.
This is by design. The reason is that security, data validation, and
transactions are managed at the Service Layer.
The UI is not allowed to bypass these important functions. Therefore,
all communication with the application must go through this
single point-of-entry (Cloud Facade) which is hosted under WCF.
Building a 3-tier application structure
Once you've decided to build your .NET application following a modern,
pattern-based, 3-tier architecture, you may be asking yourself: How do I
organize and structure my Visual Studio .NET Solution and Projects?
Patterns in Action will demonstrate
exactly how this is done - again, with great documentation and
100% pure source code.
Below are 3 annotated screenshots that show the
Solution Explorer of this reference application.
The first screenshot shows the layers in the application. They
have been numbered so that they display in a logical top-to-bottom order.
Physical Layers in 'Patterns in Action':
The next screenshot shows all 21 projects. Notice
the 3 different UI platforms in the Presentation Layer (ASP.NET, WinForms, and WPF).
As explained earlier, each of these UI platforms consume the exact same services in WCF, which,
in turn, rely on the same Business, and Data Layers (discussed below).
Projects in 'Patterns in Action':
Finally, the third screenshot shows the complete set of re-usable classes, types,
and design patterns that you will receive with your Patterns in Action solution:
Classes and other Types in 'Patterns in Action':
Gang of Four Design Patterns
Patterns in Action incorporates all of the frequently used
Gang of Four patterns, such as, Facade, Singleton, Abstract Factory,
Observer, and Proxy. Here are some details on how these patterns are used in
the application:
Facade
The Facade design pattern plays a key role in the application.
Not only does it enhance and simplify the design of the application, it
also makes it easy to be integrated into a larger WCF based SOA
(Service Oriented Architecture).
The WCF services are exposed as a single-point-of-entry
for any platform and any application that consumes its services on the cloud.
This is why it has been named Cloud Facade.
With the Facade pattern, the code-behind is often as simple as this:
(note: the controller internally invokes the Facade - or Service Layer):
CustomerController ctrl = new CustomerController();
DataViewCustomers.DataSource = ctrl.GetCustomers();
DataViewCustomers.DataBind();
Composite
The ASP.NET menu system is designed as a hierarchy with parent and child nodes.
This self-referencing
tree structure is implemented using the Composite design pattern.
Observer
Error logging and tracing are implemented with the help of the Observer pattern.
Observer classes register themselves with the Logger and listen for
Log events. In fact, two design patterns are at play here as the Logger
class is a Singleton also.
Strategy
Patterns in Action comes with a fully functional e-commerce
shopping cart. Items can be added, removed, and recalculated in the cart.
The Strategy pattern is used to swap out different strategies for
shipping charges (and can easily be extended to include
tax and insurance computations, if necessary).
Abstract Factory + Singleton
The Abstract Factory pattern solves the problem of accessing different databases.
Database specific factories are created which themselves are Singletons.
These factories allow you to change databases simply by changing an entry in
web.config. Databases supported include: MS Access, SQL Express, and SQL Server.
Proxy
Proxies typically are surrogate objects that represent external resources that
are slow or not guaranteed to be always available. In Pattern in Action we
demonstrate database proxies and WCF client proxies. These are 'stand-ins' or
proxies for the real objects.
Enterprise Design Patterns
Since the publication of the original 23 Gang of Four patterns
additional design patterns have been 'discovered'.
Especially important are the Enterprise
Design Patterns as documented in Martin Fowler's
popular book: "Patterns of Enterprise Application Architecture".
You'll be pleased to know that
more than a dozen of these valuable patterns are included in Patterns in Action.
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All this adds up to an even greater learning experience! Again, you will not find
this kind of information anywhere else -- certainly not with 100% source code!
Here is the list of Enterprise Patterns that were used to build this application.
| Enterprise Design Patterns |
| Pattern |
Description |
| Transaction Script |
Organizes business logic by procedures where each procedure handles a single request from the presentation. |
| Domain Model |
An object model of the domain that incorporates both behavior and data. |
| Service Layer |
Defines an application's boundary with a layer of services that establishes a set of available operations. |
| Lazy Load |
An object that doesn't contain all of the data you need but knows how to get it. |
| Identity Field |
Saves a database ID field in an object to maintain identity between an in-memory object and a database row. |
| Foreign Key Mapping |
Maps an association between objects to a foreign key reference between tables. |
| Page Controller |
An object that handles a request for a specific page or action on a Web site. |
| Template View |
Renders information into HTML by embedding markers in an HTML page. |
| Transform View |
A view that processes domain data element by element and transforms it into HTML. |
| Remote Facade |
Provides a coarse-grained facade on fine-grained objects to improve efficiency over a network. |
| Data Transfer Objects |
An object that carries data between processes in order to reduce the number of method calls. |
| Service Stub |
Removes dependence upon problematic services during testing. |
Model-View Design Patterns
The Model-View-Controller (MVC) design pattern is one of the oldest and best known
design patterns (first reported in 1979). Over the years, it has been
used with great success in the design of many applications (e.g Microsoft Excel).
However, over time, as more modern languages and technologies were introduced,
several expert designers started making adjustments to the original MVC pattern.
In particular the Controller class has taken on some of the responsibilities that
were originally assigned to the View class. This transition has led
to the creation of a family of patterns that are known as the
Model-View patterns.
In .NET the most important varieties in this group are:
Model View Controller, Model View Presenter, and Model View ViewModel. All of these
valuable patterns are included in Design Pattern Framework 3.5. This is where you find them:
- MVC -- ASP.NET Web Application
- MVP -- Windows Forms Application
- MVVM -- WPF Appication
Next is summary of the MV design patterns in
Patterns in Action.
| MVC: Model-View-Controller |
| ASP.NET Web Application |
Pattern Description |
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MVC and ASP.NET are not a natural match which is why Microsoft has been building a
parallel ASP.NET MVC platform.
In Patterns in Action we demonstrate a loose implementation
of the MVC pattern with ASP.NET.
Its focus is on several, rather useful, Controller classes that communicate
with the Model via WCF (Cloud Facade pattern).
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| MVP: Model-View-Presenter |
| Windows Forms Application |
Pattern Description |
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MVP is a derivative of MVC and is a widely used pattern in .NET, particularly in the Windows Forms platform.
The goal of MVP is to move business logic (e.g. selection, validation, authorization) from the View class
into the Controller class. The UI is not a good place for business logic in a 3-tier application model.
One of the great benefits of MVP over MVC is that it
is better suited from automatic unit testing.
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| MVVM: Model-View-ViewModel |
| WPF Application |
Pattern Description |
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This is the new 'kid on the block' that was first reported a couple years ago.
Microsoft has successfully used this pattern to build the Expression Blend
product.
It is a fairly complex design pattern that is well suited
for modern platforms like WPF. To use it requires that you are familiar with Commands and
Data Binding in the new WPF platform.
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Bonus 1: Getting Started Guide
The Design Pattern Framework 3.5 comes with a lot of information.
To help you get started quickly and navigate throught the different
pieces of the Framework we now include, as a bonus, an easy-to-read Getting Started guide.
This guide will get you up and running quickly and, before you know it, you'll
be joining the ranks of expert NET architects that live the .NET 3.5 pattern lifestyle.
Here are the sections included in this guide:
- Setup and Installation
- Database Configuration
- Projects and E-books in the Framework
- Learning about Design Patterns
- What are Design Patterns
- Exploring Design Patterns
- Applying Design Patterns
Bonus 2: SOA and Messaging Design Patterns
As a bonus you will receive a rich set of SOA and Messaging design patterns. These patterns
play a central role in the WCF projects. Patterns in Action contains two project
types that are built on WCF:
- WCF Hosting, and
- WCF Services
The WCF Hosting projects manage singleton resources, that is, resources of which just one
instance can exist, such as, a databases or customer images.
The WCF hosting options are configured in the web.config file.
These projects usually have very little code.
On the other hand, the WCF Service projects are usually 'code-rich' and, in Patterns in Action
contain numerous examples of SOA patterns
that help you design clean, message-oriented APIs. Below is an example of such an API which is the entire service API for
Patterns in Action.
Notice how incredibly simple it is. Each of the 3 UI platforms (ASP.NET, WinForms, WPF)
are clients to the exact same API. Quite impressive.
/// <summary>
/// Interface for Patterns in Action public services.
/// </summary>
[ServiceContract(SessionMode = SessionMode.Required)]
public interface IActionService
{
[OperationContract]
TokenResponse GetToken(TokenRequest request);
[OperationContract]
LoginResponse Login(LoginRequest request);
[OperationContract]
LogoutResponse Logout(LogoutRequest request);
[OperationContract]
CustomerResponse GetCustomers(CustomerRequest request);
[OperationContract]
CustomerResponse SetCustomers(CustomerRequest request);
[OperationContract]
OrderResponse GetOrders(OrderRequest request);
[OperationContract]
OrderResponse SetOrders(OrderRequest request);
[OperationContract]
ProductResponse GetProducts(ProductRequest request);
[OperationContract]
ProductResponse SetProducts(ProductRequest request);
[OperationContract]
CartResponse GetCart(CartRequest request);
[OperationContract]
CartResponse SetCart(CartRequest request);
}
Another take-away here is that WCF Service APIs are not object-oriented.
Instead, they are message-oriented, in which each method call represents a complete,
self-contained, transaction.
SOA and Messaging patterns make extensive use of
Data Transfer Objects (an Enterprise Pattern).
SOA is a relatively newcomer to the pattern scene, but SOA patterns
have been evolving rapidly. You will find several popular ones implemented in the
Patterns In Action reference application (as an extra bonus). These include:
- Cloud Facade design pattern,
- Document-Centric design pattern,
- Request-Response design pattern,
- Idempotent design pattern,
- Message Router design pattern, and
- Private Identifier design pattern
Of course, everything comes with 100% source code and
extensive documentation for a rich learning experience.
Bonus 3: Head First Design Patterns
If you have been following what is going on in the world of design patterns then you know that the
Head First Design Patterns book
has created quite a stir. It is one of those rare gems that has the ability to make
something as complex as design patterns, easy and fun to learn.
See for yourself and check out the reviews on Amazon or bookpool.com.
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This book is targeted at Java developers and comes with code samples in Java. We all know that
Java is similar to C# but the samples use Java types and Java packages
which makes the code all but irrelevant for .NET. Examples are:
Swing, Applets, Observer/Observable types, Java I/O classes, and Java RMI (remote
method invocation). It's hard to study these patterns and be
concerned about subtle, and not so subtle, language and platform differences.
We are happy to inform you that as an extra bonus the Design Pattern Framework
includes a complete set of Head First Design Patterns in C# and VB.NET.
You'll get a total of 46 Head First Design Pattern projects nicely packaged in an easy to use .NET solution.
Simply create a shortcut on your desktop, double click, and all source code projects are available at your fingertips.
Head First Design Patterns for .NET
The Head First book itself does not reference the Java code samples which makes it hard
to link the samples back to the appropriate pages in the book.
This is why we are including a reference document that
associates each .NET project back to the appropriate page number
where the discussion of the pattern begins. This document also
highlights the differences between Java
(i.e. the book) and the .NET
implementations of these patterns. So, snuggle up in your favorite chair with this book and the
.NET code samples and make learning design patterns a fun
experience.
Head First Reference Document
You may be interested to know that your Head First package comes with a great .NET implementation
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Model View Controller Pattern
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