Microsoft csdd - 00006

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Each layer is a VS project: Application layer is Ordering. API, Domain layer is Ordering. Domain and the Infrastructure layer is Ordering. You want to design the system so that each layer communicates only with certain other layers. That approach may be easier to enforce if layers are implemented as different class libraries, because you can clearly identify what dependencies are set between libraries.

As shown in Figure , the Ordering. Domain layer library has dependencies only on the. NET libraries or NuGet packages, but not on any other custom library, such as data library or persistence library. Figure Layers implemented as libraries allow better control of dependencies between layers. Eric Evans's excellent book Domain Driven Design says the following about the domain model layer and the application layer. Domain Model Layer : Responsible for representing concepts of the business, information about the business situation, and business rules.

State that reflects the business situation is controlled and used here, even though the technical details of storing it are delegated to the infrastructure.

This layer is the heart of business software. The domain model layer is where the business is expressed. When you implement a microservice domain model layer in.

NET, that layer is coded as a class library with the domain entities that capture data plus behavior methods with logic. Following the Persistence Ignorance and the Infrastructure Ignorance principles, this layer must completely ignore data persistence details.

These persistence tasks should be performed by the infrastructure layer. Therefore, this layer should not take direct dependencies on the infrastructure, which means that an important rule is that your domain model entity classes should be POCO s. Domain entities should not have any direct dependency like deriving from a base class on any data access infrastructure framework like Entity Framework or NHibernate.

Ideally, your domain entities should not derive from or implement any type defined in any infrastructure framework. Most modern ORM frameworks like Entity Framework Core allow this approach, so that your domain model classes are not coupled to the infrastructure. Even when it is important to follow the Persistence Ignorance principle for your Domain model, you should not ignore persistence concerns.

It is still important to understand the physical data model and how it maps to your entity object model. Otherwise you can create impossible designs.

Also, this aspect does not mean you can take a model designed for a relational database and directly move it to a NoSQL or document-oriented database. In some entity models, the model might fit, but usually it does not. There are still constraints that your entity model must adhere to, based both on the storage technology and ORM technology. Application Layer: Defines the jobs the software is supposed to do and directs the expressive domain objects to work out problems.

The tasks this layer is responsible for are meaningful to the business or necessary for interaction with the application layers of other systems. This layer is kept thin. It does not contain business rules or knowledge, but only coordinates tasks and delegates work to collaborations of domain objects in the next layer down. It does not have state reflecting the business situation, but it can have state that reflects the progress of a task for the user or the program.

A microservice's application layer in. Available with Windows Accelerate the power of learning with inclusive, accessible and affordable Windows 11 and Windows 11 SE devices for your K school district and students.

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