//[doc-seo]
{
    "Description": "Learn how to use ABP's in-memory database provider, register a MemoryDb context and repositories, and customize entity serialization."
}

In-Memory Database Provider

The Volo.Abp.MemoryDb package implements ABP repositories with an in-process database. It is useful for tests and other non-durable scenarios. Data is kept in the application process and is lost when the process stops.

Installation

Install the Volo.Abp.MemoryDb NuGet package in the data-access project:

abp add-package Volo.Abp.MemoryDb

The command adds the package and the AbpMemoryDbModule dependency to the module class. You can also configure the dependency manually as shown in the next section.

Configure the Module

Add AbpMemoryDbModule as a dependency of your module:

[DependsOn(typeof(AbpMemoryDbModule))]
public class MyDataModule : AbpModule
{
}

Create a MemoryDb Context

Derive a class from MemoryDbContext and return the entity types managed by the context:

public class MyMemoryDbContext : MemoryDbContext
{
    private static readonly Type[] EntityTypes =
    [
        typeof(Book),
        typeof(Author)
    ];

    public override IReadOnlyList<Type> GetEntityTypes()
    {
        return EntityTypes;
    }
}

Register the context in the ConfigureServices method of your module:

context.Services.AddMemoryDbContext<MyMemoryDbContext>(options =>
{
    options.AddDefaultRepositories();
});

AddDefaultRepositories() registers default repositories for the aggregate roots returned by the context. Pass includeAllEntities: true when default repositories are also needed for other entity types.

MemoryDb repositories use ABP's unit-of-work-aware database provider. Repository operations require an active unit of work.

JSON Serialization

MemoryDb stores serialized entity values. Configure Utf8JsonMemoryDbSerializerOptions to customize the underlying System.Text.Json options:

Configure<Utf8JsonMemoryDbSerializerOptions>(options =>
{
    options.JsonSerializerOptions.Converters.Add(
        new MyEntityJsonConverter()
    );
});