A common scenario in C# development where a transient scope would be used is when working with repositories or data access services.
Let’s consider a typical web application that needs to interact with a database to perform CRUD (Create, Read, Update, Delete) operations on various entities. In such an application, you often have a data access layer responsible for querying and updating the database. This data access layer is usually abstracted through interfaces to promote loose coupling and maintainability.
Now, imagine you have a
UserService that needs to interact with a
UserRepository to fetch user data from the database. The
UserService may be a scoped service since it’s generally tied to a specific HTTP request in a web application. However, the
UserRepository can be a transient service due to the following reasons:
UserRepository typically deals with data retrieval and storage and does not maintain any internal state across different requests. Therefore, creating a new instance of the repository for each request ensures that each operation is performed in isolation, and there are no unintended side effects from shared state.
UserRepository. This helps avoid potential thread-safety issues that might arise if multiple requests share the same repository instance.
Here’s how you might register the
UserRepository as a transient service in the
ConfigureServices method of your
public void ConfigureServices(IServiceCollection services)
// Other service registrations...
And the definition of
UserRepository might look like this:
public interface IUserRepository
User GetById(int id);
void Save(User user);
// Other repository methods...
public class UserRepository : IUserRepository
// Implementation of IUserRepository methods...
With this setup, every time a
UserService is resolved and used within a scoped context (e.g., an HTTP request), it will receive its own instance of
UserRepository. This ensures that data access operations are isolated, thread-safe, and work with fresh data, providing a clean and reliable way to interact with the database in your C# application.