How to Efficiently Retrieve Users and Their Roles in .NET Core 2.1 Identity?

Retrieving Users and Associated Roles in .NET Core 2.1 Identity

Many projects require a user management feature to manage and display users and their associated roles. However, obtaining this information may not be straightforward.

Solution:

Initially, utilizing the IdentityUser's Roles property was common, but it has been removed in .NET Core. One approach based on recent community suggestions involves introducing additional classes and modifying the database structure.

Modified Database Structure:

Introducing the following classes:

• ApplicationUserRole
• ApplicationRole

Extending ApplicationUser with a UserRoles property and references to the new classes.

DbContext Modifications:

• Inheriting from IdentityDbContext with the correct generic parameters to accommodate the new classes.
• Overriding the OnModelCreating method to establish relationships and set foreign key constraints.

Startup Identity Configuration:

• Maintaining the previous Identity configuration and ensuring the correct generic parameters are used.

Eager Loading for User Roles:

Finally, when retrieving users, eagerly load the UserRoles and their associated Roles:

this.Users = userManager.Users.Include(u => u.UserRoles).ThenInclude(ur => ur.Role).ToList();

ASP Core 2.2 Considerations:

• IdentityUserRole is now defined with Guid as the type, not string.
• The ModelBuilder code may need to be removed to allow migrations to work.

By following this approach, you can effectively retrieve users and their associated roles in .NET Core 2.1 Identity.

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