Design Patterns Library

The design patterns library contains descriptions and examples of software design patterns that you can apply in your daily development. These patterns are time proven techniques for building long-lived, well factored software that are widely used in software development today. Unlike other courses in our library, this course will continue to grow with new patterns each month, so check back often.

Authored by: Steve Smith , et al.
Duration: 15h 1m
Level: Intermediate
Released: 9/10/2010

Course Rating:

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expand all \| collapse all	Progress	Duration
Introduction to Design Patterns		00:18:45
Introduction		00:48
What They Are		04:30
Design Pattern History		03:15
Pattern Organization and Language		01:49
Why Patterns Matter		03:09
Criticisms		01:00
The PSOD Patterns Library		02:14
Summary		02:00
Adapter Pattern		00:29:09
Introduction		00:10
Motivating Example		01:19
Graphic Example		00:54
Real World Example		01:19
Intent		00:25
Applicability		01:01
Structure		01:30
How It Gets Used		00:58
Collaboration		00:15
Consequences		01:15
Implementation Example		01:12
Demo		16:01
Related Patterns		01:26
References		00:37
Summary		00:47
Bridge Pattern		00:30:20
Introduction		01:10
What Is It?		02:44
Nom Nom Burger		03:39
Inital Problem		03:14
Wrong Solution		04:11
Refactoring to Bridge		04:19
Standard Formatter		02:17
Reverse Formatter		01:45
Fancy Formatter		00:53
What We Did		02:57
Common Usages		02:00
Summary		01:11
The Builder Pattern		00:44:48
Introduction		02:43
Understanding Builder		05:21
Problem 1		04:57
Problem 2		08:33
Problem 3		10:12
What We Built		07:04
Variations		03:21
Summary		02:37
Chain of Responsibility		00:23:25
Introduction		02:22
Traditional Usage		00:20
Motivating Example		00:40
Demo: Expense Report		03:36
Demo: Expense Report w/CoR		05:38
Demo: Non-Traditional Usage		09:34
Summary		01:15
The Command Pattern		00:23:57
Introduction		00:23
Motivating Example		04:02
Intent and Applicability		02:41
Structure and Consequences		04:04
Implementation Example		10:33
Related Patterns		00:54
Summary		01:20
Composite Pattern		00:29:10
Introduction		01:03
Breaking it Down		01:58
Email Example		02:39
Split Gold		03:52
Refactoring 1		03:42
Refactoring 2		05:33
Adding Depth		03:32
Using a Root		01:20
Formal Definition		01:41
When to Use		02:08
Summary		01:42
Decorator Design Pattern		00:27:04
Introduction		00:45
Motivating Example		02:14
Intent		02:16
Applicability		01:58
Structure		03:47
How it Works		01:50
Motivating Example Refactored		01:01
Demo: Overview of the Project		01:22
Demo: Create the Decorator		02:25
Demo: Create the Concrete Decorator		04:42
Demo: Adding more Concrete Decorators		01:41
Consequences		01:18
Related Patterns		01:03
Summary		00:42
Event Aggregator		00:30:49
Introduction		00:09
Motivating Example		00:51
Demo: The Order Application		00:37
Pattern Intent		01:48
Applicability		01:15
Demo: Solving With Standard .NET Events		05:57
Issues with Current Implementation		02:22
Pattern Structure		00:29
Demo: Using Event Aggregator		07:29
Demo: Details of Implementation		04:39
Consequences of the Pattern		01:18
Known Variations		02:26
Related Patterns		00:57
Summary		00:32
Facade Pattern		00:20:07
Introduction		00:30
Intent		02:14
Demo: Motivating Example 1		03:00
Demo: Motivating Example 2		01:33
Structure		02:12
Consequences		00:53
Demo: Facade Pattern Example		03:15
Common Uses		01:08
Demo: Real World Example		03:27
Related Patterns		00:47
Summary		01:08
Factory Patterns		00:36:14
Introduction		00:32
Motivating Example		01:18
Demo: Example		03:30
Intent		01:30
Simple Factory Pattern		00:54
Demo: Simple Factory Pattern		04:14
Simple Factory Pattern Notes		01:19
Factory Method Pattern		01:47
Demo: Factory Method Pattern		06:02
Factory Method Pattern Notes		01:54
Abstract Factory Pattern		02:53
Demo: Abstract Factory Pattern		04:01
Abstract Factory Pattern Notes		01:21
Real World Examples		03:04
Summary		01:55
Flyweight		00:18:03
Introduction		00:32
Intent		00:55
Demo: Motivating Example		05:39
Structure		02:55
Consequence		01:22
Demo: Implementing the Pattern		02:31
Demo: Real World Example		02:40
Related Patterns		01:08
Summary		00:21
Interpreter Pattern		00:22:28
Introduction		00:39
Break Down		02:18
Bar Codes		01:40
How Bar Codes Work		01:50
A Challenge		01:56
Sandwhich Demo Overview		07:27
Sandwhich Demo		03:32
Formal Definition		01:48
Summary		01:18
Iterator Pattern		00:31:15
Introduction		00:48
Pattern Usage		01:33
Without Iterators		01:09
Intent		00:32
Applicability		02:13
Iterators in C#		02:20
Collaboration		00:38
Consequences		00:44
Demo		17:53
Related Patterns		02:04
Summary		01:21
Lazy Load Pattern		00:52:15
Introduction		00:16
Motivating Example		01:10
Intent		01:07
Applicability		01:36
Lazy Initialization		02:16
Demo: Lazy Initialization		11:16
Virtual Proxy		02:44
Demo: Virtual Proxy		03:54
Proxy Consequences		01:24
Value Holder		01:35
Demo: Value Holder		05:56
Ghosts		01:26
Demo: Ghosts		11:36
How It Is Used		00:56
Consequences		02:42
Related Patterns		00:19
References		00:39
Summary		01:23
Mediator Pattern		00:14:26
Introduction		00:07
Motivating Example		00:20
Demo: Motivating Example		03:13
Definition		02:37
Demo: Mediator Pattern		06:22
Advantages and Disadvantages		01:18
Summary		00:29
Memento		00:21:03
Introduction		01:09
Intent		00:31
Applicability		01:13
How It Is Used		00:46
Undo / Redo		00:57
Collaboration		00:39
Consequences		01:17
Operations		02:16
Iterative State		00:51
Demo: WPF Paint		09:31
Related and Summary		01:53
Model View Presenter (MVP) Pattern		00:41:40
Introduction		01:24
Why You Care		01:19
Intent		02:49
A Note on Variations		02:41
Structure and Organization		05:34
Demo: Web Form Example 1		10:08
Demo: Web Form Example 2		07:52
Demo: Windows Forms Example		03:26
Collaboration Among Objects		02:10
Consequences		01:02
Known Uses		00:52
Related Patterns		00:40
Summary		01:43
Model View ViewModel (MVVM) Pattern		00:43:31
Introduction		01:31
History		02:24
Intent		02:11
Structure		02:01
Demo: Creating the Application		01:33
The Model		01:13
Demo: Creating the Model		04:04
The ViewModel		01:54
Demo: Creating the ViewModel		03:02
The View		01:19
Demo: Creating the View		05:37
Binding the View and ViewModel		03:09
Communication Between the View and ViewModel		00:52
Demo: Communicating with Commands		06:22
Collaboration		02:07
Consequences		01:50
Known Uses		01:01
Related Patterns		00:33
Summary		00:48
Null Object Pattern		00:21:58
Introduction		00:25
Motivating Example		01:05
Demo: Example 1		01:23
Demo: Example 2		03:07
Intent		01:18
Applicability		01:53
Also Known As		00:45
Structure		01:27
Demo: Implementation Example		06:11
Consequences		01:20
Notes and Related Patterns		02:15
Summary		00:49
Observer Pattern		00:28:38
Introduction		01:50
Motivating Example		02:46
Introduction to the Observer		01:43
Traditional		01:08
Demo: Traditional		02:38
Consequences		02:55
Events and Delegates		01:37
Demo: Events and Delegates		02:54
IObserver		03:02
Demo: IObserver		04:05
Real World Examples		02:36
Summary		01:24
The Prototype Pattern		00:31:48
Introduction		03:13
Understanding Prototype		03:51
Problem 1		06:07
Problem 2		04:07
Problem 3		03:47
The Prototype Design		04:11
Language Examples		04:01
Summary		02:31
Proxy Pattern		00:34:32
Introduction		00:08
Intent		00:13
Motivating Example		00:50
Applicability		00:42
Structure		01:25
How It Is Used		00:43
Lazy Loading		01:52
Consequences		01:54
Demo: Virtual Proxy		11:59
Demo: Remote Proxy		06:01
Demo: CachedRepository		06:12
Related Patterns		01:25
Summary		01:08
Repository		00:29:59
Introduction		01:38
Intent		02:03
IEmployeeRepository		07:04
Generic IRepository		01:53
Repository at Work		02:33
Implementing a Repository		05:25
Tests and Separation		04:16
Applicability		01:13
Consequences		01:35
Related Patterns		01:38
Summary		00:41
Singleton		00:31:33
Introduction		00:14
Motivating Example		00:40
Intent		00:25
Applicability		00:33
Structure		00:47
Structure (not thread safe)		01:11
How It Is Used		00:42
Structure (thread safe)		02:05
Collaboration		00:18
Consequences		00:46
Single Responsibility		00:51
Implementation Example		03:54
Demo: Adding the Singleton		16:11
Related Patterns		00:52
References		01:00
Summary		01:04
Service Locator Pattern		00:24:37
Introduction		01:08
Motivating Example		01:13
Demo: Simple Version		01:45
Intent		02:13
Structure		00:51
Demo: Improved Version		03:30
Other Providers		01:31
Demo: Advanced Version		05:59
Benefits		02:07
Consequences		01:04
Related Patterns		01:39
Summary		01:37
State Pattern		00:21:37
Introduction		01:03
Motivating Example		01:59
Demo: Simple Version		01:51
Demo: Simple Version Code Review		01:57
Issues with the Simple Approach		00:50
Intent		01:19
Structure		01:42
Demo: Advanced Version Code Review		02:36
States		02:48
State Change		00:44
Demo: Advanced Version		01:11
Benefits		01:27
Known Uses		01:07
Summary		01:03
Strategy Pattern		00:21:29
Introduction		00:41
Demo: Motivating Example		06:02
Intent and Applicability		02:30
The Pattern in UML		01:47
Demo: Implementation Example		03:03
Consequences		02:11
Variation Examples		04:06
Summary		01:09
Template Method		00:15:18
Introduction		00:07
Motivating Example		01:28
Applicability		00:29
Structure		01:02
How It Is Used		00:34
Consequences		00:33
Hooks		00:19
Hollywood Principle		00:30
Implementation Example		08:23
Related Patterns		00:27
References		00:54
Summary		00:32
Unit of Work		00:20:46
Introduction		02:25
Intent		02:27
UoW in ADO.NET		02:19
ObjectContext		02:33
IUnitOfWork		03:14
Implementing IUnitOfWork		03:23
Applicability and Consequences		01:19
Related Patterns		02:03
Summary		01:03
Visitor Pattern		00:22:57
Introduction		01:05
Breaking it Down		01:38
Real Life Example		02:56
Net Worth Without Visitor		02:06
Refactoring to Visitor		07:51
Monthly Income Visitor		03:17
Formal Definition		02:20
Summary		01:44
Rules Pattern		00:37:29
Introduction		00:54
Motivating Example		00:41
Demo: Customer Discounts		05:01
What's the Problem?		01:44
Intent		01:42
Applicability		00:39
Structure		00:38
Demo: Using Rules		13:31
Alternate Structure		00:38
Considerations		01:13
Business Rules Engines		00:59
Practice: Greed Kata		01:26
Demo: Greed Overview		06:38
Summary		01:45

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