The use of DTOs is highly recommended, as it becomes very advantageous to the applications, principally if the data exposed are sensitive-beyond the possibility of personalization of entities, you can avoid excessive use of queries to the APIs. If you run the project and access the address: you will have the list of sellers returned from the database, as in the image below: Instead, the items in this list will be forwarded to the DTO (sellerDto), which will return the data to the client. The variable “sellers” will receive the list of records returned, but it will not be sent directly to the client, as it contains all the seller’s data, such as the “DiscountFactor,” which in this context should not be exposed. In this method we are creating an endpoint to query the database.
EntityFrameworkCore public class AppDbContext : DbContext
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So, create a new folder called “Data,” and inside it add a new class called “AppDbContext.” Inside that put the code below. Next, let’s create the Data Context, which is the representation of the database. Then, through Nuget Package Manager (Visual Studio) or through the terminal, add the following packages: Now we will add to the project the libraries that we will need to implement the database objects. So, create a folder called “Models,” and inside it create a new class called “Seller,” and put this code in it: public record Seller (Guid Id, string Name, DateTime CreatedAt, string Email, string Address, decimal DiscountFactor ) Īnd also a new class called “SellerDto” and put the code below in it: public record SellerDto ( string Name, string Email ) Entity Framework Packages Let’s create the domain class (Seller) which will be the class that will reflect the database table entity, both for fetching data and persisting, and also the class that will be the DTO (SellerDto) that will only expose the data that may be public. Read more to understand how it all works, and what it means for building APIs in ASP.NET Core. Minimal APIs allow you to build APIs without the overhead of the complicated MVC solution. In the terminal, run the following command to create the base app, which will be a minimal API.
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You can access the full source code at this link: Source code. Next, we will create a simple web application in. In the flowchart below, the client requests the server the DTO entity, the server gets the domain entity and returns the DTO entity in the response. This way, you can change the presentation layer without affecting the existing domain layers, and vice versa. Manipulate nested objects to make them more convenient for clientsĭTOs provide an efficient way to separate domain objects from the presentation layer.Omit properties to reduce the payload size.Hide specific properties that clients don’t need to receive.Separate the service layer from the database layer.The use of DTOs is very common in web development with ASP.NET Core as they provide solutions for many needs. It’s used only to send and receive data and does not contain in itself any business logic. What Is a DTO?Ī DTO (Data Transfer Object) is an object that defines how data will be sent between applications.
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In this article, we’ll look at the basics of DTOs and how to implement them in practice by creating a web API in. To solve these problems, you can define a DTO. If this is done directly, many problems can arise, especially if you want to manipulate the way this data is sent and received.
NET, an API for example, the data contained in the database is mapped and sent to the client. A good practice is to use DTOs that will define how the data will be sent over the network. In this context, we must take special care to avoid future problems.
Something common in ASP.NET Core development is data transfer.
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