How to Choose Between AddTransient and AddScoped for Repository Registration in ASP.NET Core: A Comprehensive Guide

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When building applications with ASP.NET Core, it’s common to use dependency injection to manage dependencies between different components. One aspect of this is registering repository classes that handle interactions with a database or other data store.

When registering a repository with the ASP.NET Core dependency injection container, there are two options for the lifetime of the repository: transient and scoped. Here’s what you need to know about the difference between the two.

Transient Repositories

A transient repository is created every time it’s needed, and then disposed of once the operation that requested it has been completed. This means that a new instance of the repository is created every time it’s requested.

Here’s an example:

services.AddTransient<IRepository, Repository>();

In this example, a new instance of Repository will be created every time it's requested.

This might be appropriate for certain types of repositories, such as those that handle read-only operations, or those that are very lightweight.