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  1. Best Asp.NET Core Books
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He mentioned that it had helped him out quite a bit in the area of Web Services, so I thought I would take the time to share the post on here. Since the question pertains to Web Services, let's use the following paraphrased definition provided from this Stack Overflow discussion as there is no reason to reinvent the wheel :. To clarify a bit, when you create a website or application that outputs HTML, its target is the browser and by extension the human being reading the page in the browser.

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Basically, you can think of a Web Service as an application that can communicate with other applications to either send data, receive data or exposes certain methods for doing either of those things. You can find a great summary of both of these types of services here and detailed below :.

REST is focused on accessing named resources through a single consistent interface. SOAP exposes operations. SOAP is focused on accessing named operations, each implement some business logic through different interfaces. You can find another in-depth discussion here that details many of the differences between the two protocols.

I'll include a few resources below on how to get started with using either of these technologies. Windows Communication Foundation is a framework that was designed by Microsoft to construct and build Web Services that can be used to provide an API and other services to other web applications. We need to think in an asynchronous method due to the fact that we have to wait for the database to complete some operation to return the data, and this process can take a while. We have a lot of conventions, right? NET technology. If you come from a language such as Javascript or another non-strongly typed language, this concept may seem strange.

Interfaces allow us to abstract the desired behavior from the real implementation. Using a mechanism known as dependency injection , we can implement these interfaces and isolate them from other components. Basically, when you use dependency injection, you define some behaviors using an interface.

Then, you create a class that implements the interface. Finally, you bind the references from the interface to the class you created. I have defined a constructor function for our controller a constructor is called when a new instance of a class is created , and it receives an instance of ICategoryService. It means the instance can be anything that implements the service interface.

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By the way, the underscore prefix is another common convention to denote a field. This convention, in special, is not recommended by the official naming convention guideline of. The method uses our category service instance to list all categories and then returns the categories to the client.

The framework pipeline handles the serialization of data to a JSON object. Finally, when we define an async method, we have to us e the await keyword for tasks that can take a while.

Professional ASP. NET Web services

Ok, we defined the initial structure of our API. Now, it is necessary to really implement the categories service. In the root folder of the API the Supermarket. API folder , create a new one called Services. Inside the new folder, add a new class called CategoryService. Change the code as follows:. We need to access the database and return all categories, then we need to return this data to the client.

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A service class is not a class that should handle data access. There is a pattern called Repository Pattern that is used to manage data from databases.

When using the Repository Pattern, we define repository classes , that basically encapsulate all logic to handle data access. These repositories expose methods to list, create, edit and delete objects of a given model, the same way you can manipulate collections. Internally, these methods talk to the database to perform CRUD operations , isolating the database access from the rest of the application.

It may seem redundant to create a new definition for handling the data access logic, but you will see in a while that isolating this logic from the service class is really advantageous. Inside the Domain folder, create a new directory called Repositories. Then, add a new interface called ICategoryRespository.

Define the interface as follow:. Having defined the interface, we can come back to the service class and finish implementing the listing method, using an instance of ICategoryRepository to return the data. Now we have to implement the real logic of the category repository. Before doing it, we have to think about how we are going to access the database. This framework comes with ASP. The EF Core also allows us to design our application first, and then generate a database according to what we defined in our code.

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This technique is called code first. In the root folder of the API, create a new directory called Persistence. This directory is going to have everything we need to access the database, such as repositories implementations. Inside the new folder, create a new directory called Contexts , and then add a new class called AppDbContext. Change the code in the following way:. The constructor we added to this class is responsible for passing the database configuration to the base class through dependency injection.

Now, we have to create two DbSet properties. These properties are sets collections of unique objects that map models to database tables. Change the AppDbContext class as follows:. We specify to which tables our models should be mapped. We say that a category has many products, and we set the properties that will map this relationship Products , from Category class, and Category , from Product class. We also set the foreign key CategoryId.

Take a look at this tutorial if you want to learn how to configure one-to-one and many-to-many relationships using EF Core, as well as how to use it as a whole. Here we simply add two example categories by default. Having implemented the database context class, we can implement the categories repository. Add a new folder called Repositories inside the Persistence folder, and then add a new class called BaseRepository. This class is just an abstract class that all our repositories will inherit.

You have to create direct classes to create the instances. Add a new class on the same folder called CategoryRepository.

Notice how simple it is to implement the listing method. We use the Categories database set to access the categories table and then call the extension method ToListAsync , which is responsible for transforming the result of a query into a collection of categories. The query is only executed when you call a method that will transform your data into a collection, or when you use a method to take specific data. The last step before testing the application is to bind our interfaces to the respective classes using the ASP.

NET Core dependency injection mechanism. In the root folder of the application, open the Startup class. This class is responsible for configuring all kinds of configurations when the application starts. The ConfigureServices and Configure methods are called at runtime by the framework pipeline to configure how the application should work and which components it must use. Have a look at the ConfigureServices method.

We can use the ConfigureServices method, accessing the services parameter, to configure our dependency bindings. Clean up the class code removing all comments and change the code as follows:.

Part 2 Consuming a web service

Here we configure the database context. We tell ASP. NET Core to use our AppDbContext with an in-memory database implementation, that is identified by the string passed as an argument to our method.

Pro Web API - HTTP Web Services in | Ali Uurlu | Apress

The configuration of these lines internally configures our database context for dependency injection using a scoped lifetime. The scoped lifetime tells the ASP. NET Core pipeline that every time it needs to resolve a class that receives an instance of AppDbContext as a constructor argument, it should use the same instance of the class. If there is no instance in memory, the pipeline will create a new instance, and reuse it throughout all classes that need it, during a given request. There are other lifetime scopes that you can check reading the official documentation.

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