This is the class where the Application knows about various services and registrations required. Navigate to your API Project’s Startup class. I have written an article on Entity Framework Core in ASP.NET Core 3.1. Imagine how helpful this feature will be when we have pretty long classes.Ĭonfiguring the API Services to support Entity Framework Core Verify the name of the Interface to be generated and click Ok. Once selected, go to Edit -> Refactor -> Extract Interface.In our case, go to the ApplicationContext.cs class. Go to the class that we need an Interface for.Visual Studio is much powerful than what we think it is. Now that we have completed the class, let me show you an easy way to generate an Interface for any given class. Public bool IsActive PRO TIP – How to Extract an Interface from a Class? Add a Models Folder and create a new class named Product with the following properties. Since we are following a code first Approach, let’s design our data models. Install-Package Adding the Product Model Install-Package Microsoft.EntityFrameworkCore We will explore these packages as we progress. Just Copy Paste the below lines over to your Package Manager Console. Install these following packages to your API project via the Package Manager Console. Open up Visual Studio and Create a new ASP.NET Core Web Application with the WebApi Template. If you do not have it, I totally recommend getting it. The IDE I use is Visual Studio 2019 Community. PS – We will not be using any advanced architectural patterns, but let’s try to keep the code clean. Here, I use Entity Framework Core as the ORM to access data from my local DataBase. Let us build an API endpoint that does CRUD operations for a Product Entity, ie, Create / Delete / Update / Delete product record from the Database. I will push the implemented solution over to Github, You can find the link to my repository at the end of this post. Let’ s build an ASP.NET Core 3.1 WebApi to showcase the implementation and better understand the CQRS Pattern. Implementing CQRS Pattern in ASP.NET Core 3.1 WebApi This according to me is a small price to pay while getting the awesome features and possibilities with the pattern. In other words, you will end up with at least 3 or 4 times more code-lines than you usually would. The one thing that may concern a few programmers is that this is a code demanding pattern. Cons of CQRS Added Complexity and More Code Since we have dedicated models per oprtation, there is no possibility of data loss while doing parellel operations. CQRS pattern will support this usage out of the box, you would not have to break your head trying to implement such a cache mechanism. With this pattern you could speed up the performance on your read operations by introducing a cache or NOSQL Db like Redis or Mongo. ![]() Practically speaking there are always 10 times more Read Operations as compared to the Write Operation. Having control over the models in accordance with the type of data operations makes your application highly scalable in the long run. Rather we have one model per data operation that gives us all the flexibility in the world. Thanks to the segregated approach of this pattern, we will no longer need those complex model classes within our application. But when your requirements suddenly start getting complex, this basic approach can prove to be a disaster. This can be the go-to approach when your application is related to just CRUD operations and nothing more. The problem with traditional architectural patterns is that the same data model or DTO is used to query as well as update a data source. More formally, methods should return a value only if they are referentially transparent and hence possess no side effects. ![]() In other words, asking a question should not change the answer. It states that every method should either be a command that performs an action, or a query that returns data to the caller, but not both. ![]() This pattern was originated from the Command and Query Separation Principle devised by Bertrand Meyer. It essentially separates the concerns in terms of reading and writing, which makes quite a lot of sense. Here Command refers to a Database Command, which can be either an Insert / Update or Delete Operation, whereas Query stands for Querying data from a source. Defining the Connection String in appsettings.jsonĬQRS, Command Query Responsibility Segregation is a design pattern that separates the read and write operations of a data source.Configuring the API Services to support Entity Framework Core.Implementing CQRS Pattern in ASP.NET Core 3.1 WebApi.
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