Sullivan008 / CSharp-Console-CQRSExample

The following repository show how to implement CQRS Pattern in a Console Application.

C# - Console CQRS Example Application [Year of Development: 2019]

About the application technologies and operation:

Technologies:

• Programming Language: C#
• FrontEnd Side: Console Application
• BackEnd Side: .NET Framework 4.6.1.

Installation/ Configuration:

1. Restore necessary Packages, run the following command in PM Console

   Update-Package -reinstall
   

About the application:

What is CQRS?

First, let’s tackle at the very core what CQRS actually is.

CQRS stands for Command Query Responsibility Segregation and was coined by Greg Young. CQRS is related to CQS (Command Query Separation) principle by Bertrand Myer which states:

Every method should either be a command that performs an action, or a query that returns data to the caller, but not both.

In other words, a command is a method that mutates state and query is a method that returns state. A method generally doesn’t do both, but there are exceptions to this rule.

CQRS takes CQS a step further by separating commands and queries into different objects.

The application shows the following:

• How to implement CQRS Pattern on a Person Entity.
• How to implement CQRS Pattern and Event Sourcing.