Business logic should reside in services and classes within the Models folder.Īlthough simple, the single-project monolithic solution has some disadvantages. In this arrangement, presentation details should be limited as much as possible to the Views folder, and data access implementation details should be limited to classes kept in the Data folder. The default template includes separate folders for MVC pattern responsibilities of Models, Views, and Controllers, as well as additional folders for Data and Services. In a single project scenario, separation of concerns is achieved through the use of folders. Figure 5-1 shows the file structure of a single-project app.įigure 5-1. It contains all of the behavior of the application, including presentation, business, and data access logic. In this architecture, the entire logic of the application is contained in a single project, compiled to a single assembly, and deployed as a single unit.Ī new ASP.NET Core project, whether created in Visual Studio or from the command line, starts out as a simple "all-in-one" monolith. The smallest possible number of projects for an application architecture is one. If such an application needs to scale horizontally, typically the entire application is duplicated across multiple servers or virtual machines. It may interact with other services or data stores in the course of performing its operations, but the core of its behavior runs within its own process and the entire application is typically deployed as a single unit. What is a monolithic application?Ī monolithic application is one that is entirely self-contained, in terms of its behavior. However, even given this single unit of deployment, most non-trivial business applications benefit from some logical separation into several layers. This approach is the simplest deployment model and serves many internal and smaller public applications very well. NET applications are deployed as single units corresponding to an executable or a single web application running within a single IIS appdomain. "If you think good architecture is expensive, try bad architecture."
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