I would like to know: are any GoF design patterns are used in the .NET Framework? BOUNTY: I have seen the MSDN link below in an answer. Are there any post/video or can you can list patterns and most importantly WHERE it is used?

The .NET framework uses many of the Gang of Four patterns. Here are just a few examples: Creational patterns <ul> <li> Abstract Factory: <code>System.Data.Common.DbProviderFactory</code>. Every member function of this class is a factory method. </li> <li> Builder: The WCF channel construction infrastructure. </li> <li> Factory Method: <ul> <li> <code>System.Data.IDbConnection.BeginTransaction()</code>. The type of transaction created depends on the underlying IDbConnection implementation.</li> <li> <code>WebRequest.Create()</code> returns a concrete type that depends on the URL scheme.</li> </ul> </li> <li> Prototype - used in framework for cloning and serialization</li> <li> Singleton - used as an activation method in WCF, i.e. a web service may be treated as a singleton by the WCF infrastructure. Ditto for .NET Remoting.</li> </ul> Structural patterns <ul> <li> Adapter: The ADO.NET providers, eg <code>System.Data.SqlClient.SqlConnection</code>, <code>System.Data.OleDb.OleDbConnection</code> etc. Each provider is an adapter for its specific database.</li> <li> Composite: many examples <ul> <li> <code>System.Windows.Forms.Control</code> and its derived classes.</li> <li> <code>System.Web.UI.Control</code> and its derived classes.</li> <li> <code>System.Xml.XmlNode</code> and its derived classes.</li> </ul> </li> <li> Decorator: <ul> <li> <code>System.Windows.Controls.Decorator</code> (in WPF).</li> <li>Some implementations of <code>Stream</code> are decorators around an inner stream (e.g. <code>GZipStream</code>, <code>CryptoStream</code>).</li> </ul> </li> <li> Facade: <code>System.Xml.Serialization.XmlSerializer</code>. XmlSerializer hides a complex task (that includes generating assemblies on the fly!) behind a very easy-to-use class.</li> <li> Proxy: The web service proxies generated by svcutil.exe and deriving from <code>System.ServiceModel.ClientBase<TChannel></code> </li> </ul> Behavioral Patterns <ul> <li> Chain of responsibility: <code>System.Web.UI.Control.OnBubbleEvent()</code> and <code>System.Web.UI.Control.RaiseBubbleEvent()</code>. </li> <li> Command:<code>System.Windows.Input.ICommand</code> (in WPF).</li> <li> Interpreter: <code>System.Linq.Expressions.Expression</code> and related classes.</li> <li> Iterator: many examples <ul> <li> <code>System.Collections.IEnumerable</code>.</li> <li> <code>System.Collections.Generic.IEnumerable<T></code>.</li> <li> <code>System.Data.IDataReader</code>. </li> </ul> </li> <li> Memento: The .NET Serializable pattern is a variation on the Memento pattern.</li> <li> Observer - The .NET event mechanism.</li> <li> Strategy - Sort method in ArrayList </li> <li> Template Method - Render method for custom controls</li> <li> Visitor : <code>System.Linq.Expressions.ExpressionVisitor</code> (used internally by [LINQ])</li> </ul>

Are there any design patterns used in the .NET Framework?

I would like to know: are any GoF design patterns are used in the .NET Framework?

BOUNTY:

I have seen the MSDN link below in an answer. Are there any post/video or can you can list patterns and most importantly WHERE it is used?

What design patterns are used throughout the .NET framework?

The . NET Framework uses the IEnumerable and IEnumerator interfaces to implement the Iterator pattern.

What are .NET design patterns?

Design Patterns in the object-oriented world is a reusable solution to common software design problems that occur repeatedly in real-world application development. It is a template or description of how to solve problems that can be used in many situations. "A pattern is a recurring solution to a problem in a context."

What is design pattern in framework?

Design patterns are smaller architectural elements than frameworks. A typical framework contains several design patterns, but the reverse is never true. Design patterns are less specialized than frameworks. Frameworks always have a particular application domain.

Which design patterns is used in Entity Framework?

Factory Method, an Entity Framework ObjectContext provides a CreateObjectSet<T> method, which creates an ObjectSet<T> for the given type. Since those object-sets are the main approach to access the entities within a context, I would say it is also a very important pattern used in EF.

The .NET framework uses many of the Gang of Four patterns. Here are just a few examples:

Creational patterns

Abstract Factory: System.Data.Common.DbProviderFactory. Every member function of this class is a factory method.
Builder: The WCF channel construction infrastructure.
Factory Method:
- System.Data.IDbConnection.BeginTransaction(). The type of transaction created depends on the underlying IDbConnection implementation.
- WebRequest.Create() returns a concrete type that depends on the URL scheme.
Prototype - used in framework for cloning and serialization
Singleton - used as an activation method in WCF, i.e. a web service may be treated as a singleton by the WCF infrastructure. Ditto for .NET Remoting.

Structural patterns

Adapter: The ADO.NET providers, eg System.Data.SqlClient.SqlConnection, System.Data.OleDb.OleDbConnection etc. Each provider is an adapter for its specific database.
Composite: many examples
- System.Windows.Forms.Control and its derived classes.
- System.Web.UI.Control and its derived classes.
- System.Xml.XmlNode and its derived classes.
Decorator:
- System.Windows.Controls.Decorator (in WPF).
- Some implementations of Stream are decorators around an inner stream (e.g. GZipStream, CryptoStream).
Facade: System.Xml.Serialization.XmlSerializer. XmlSerializer hides a complex task (that includes generating assemblies on the fly!) behind a very easy-to-use class.
Proxy: The web service proxies generated by svcutil.exe and deriving from System.ServiceModel.ClientBase<TChannel>

Behavioral Patterns

Chain of responsibility: System.Web.UI.Control.OnBubbleEvent() and System.Web.UI.Control.RaiseBubbleEvent().
Command:System.Windows.Input.ICommand (in WPF).
Interpreter: System.Linq.Expressions.Expression and related classes.
Iterator: many examples
- System.Collections.IEnumerable.
- System.Collections.Generic.IEnumerable<T>.
- System.Data.IDataReader.
Memento: The .NET Serializable pattern is a variation on the Memento pattern.
Observer - The .NET event mechanism.
Strategy - Sort method in ArrayList
Template Method - Render method for custom controls
Visitor : System.Linq.Expressions.ExpressionVisitor (used internally by [LINQ])

Are there any design patterns used in the .NET Framework?

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Are there any design patterns used in the .NET Framework?

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