About Multi-Tenancy

We strongly recommend that you read the multi-tenancy documentation before this one.

Enabling Multi-Tenancy

ASP.NET Boilerplate and Module Zero can run in multi-tenant or single-tenant modes. Multi-tenancy is disabled by default. We can enable it in the PreInitialize method of our module as shown below:

[DependsOn(typeof(AbpZeroCoreModule))]
public class MyCoreModule : AbpModule
{
    public override void PreInitialize()
    {
        Configuration.MultiTenancy.IsEnabled = true;    
    }

    ...
}

Note: Even if our application is not multi-tenant, we must define a default tenant (see Default Tenant section of this document). 

When we create a project template based on ASP.NET Boilerplate and Module Zero, we have the Tenant entity and the TenantManager domain service.

Tenant Entity

The Tenant entity represents a Tenant of the application.

public class Tenant : AbpTenant<Tenant, User>
{

}

It's derived from a generic AbpTenant class. Tenant entities are stored in the AbpTenants table in the database. You can add your own custom properties to the Tenant class.

The AbpTenant class defines some base properties, the most important are:

• TenancyName: This is the unique name of a tenant in the application. It should not normally be changed. It can be used to allocate subdomains to tenants like 'mytenant.mydomain.com'. As such, it cannot contain spaces. Tenant.TenancyNameRegex constant defines the naming rule.
• Name: An arbitrary, human-readable, long name of the tenant.
• IsActive: True, if this tenant can use the application. If it's false, no user of this tenant can login to the application.

The AbpTenant class inherits FullAuditedEntity. This means it has creation, modification and deletion audit properties. It is also Soft-Delete, so when we delete a tenant, it's not deleted from the database, just marked as deleted.

Finally, the Id of AbpTenant is defined as an int.

Tenant Manager

The Tenant Manager is a service to perform the domain logic for tenants:

public class TenantManager : AbpTenantManager<Tenant, Role, User>
{
    public TenantManager(IRepository<Tenant> tenantRepository)
        : base(tenantRepository)
    {

    }
}

The TenantManager is also used to manage the tenant features. You can add your own methods here. You can also override any method of the AbpTenantManager base class for your own needs.

Default Tenant

ASP.NET Boilerplate and Module Zero assume that there is a pre-defined tenant where the TenancyName is 'Default' and the Id is 1. In a single-tenant application, this is used as the only tenant. In a multi-tenant application, you can delete it or make it passive.