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First published by XAML guy (eMicrosoft Partne)
When: 26 Aug 2012 4:58 PM
Last revision by XAML guy (eMicrosoft Partne)
When: 11 Sep 2012 1:03 PM
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Mediator Design Pattern

This article describes the Mediator design pattern. This is a behavioral design pattern, a category of design pattern used by software engineers, when writing computer programs.

Introduction
Benefits
See Also
Community Resources
References section

Introduction

A Mediator is a design pattern, used in software engineering, to communicate between parts within an application. It provides a unified interface.

It is defined as a behavioral design pattern because messages can cause the program to behave differently, like actions resulting from an event message.

Benefits

As programs grow in complexity, and more and more classes and relationships are added, it becomes harder to follow the chain of communication around the code. The mediator pattern attempts to centralize and standardize the methods and channels of communication around the application, thus reducing complexity, enhancing readability and maintainability.

The mediator is especially useful in projects are built around the MVVM pattern, because it enables communication between separate and unrelated ViewModels, which may reside in different parts of the application (like separate windows), or from deep within autogenerated controls (like in cells of DataGrid).

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Community Resources

These are the external links, including links to Microsoft and TechNet sites that are non-Wiki

The Mediator Pattern
How to Build, Manage and Navigate the User Interface of a WPF Application
The "Mediator" has been encapsulated into Sacha Barber's Cinch
Called a "Messenger" in Gala's MVVMLite framework
An early example from Josh Smith - A Mediator Prototype for WPF Apps
MVVM Foundation version - http://mvvmfoundation.codeplex.com/

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References section

Use this section if you pulled source material and ideas from other sites, blogs, or forums. Make sure you have permission from authors to use their material.