How to Get All Users with Their Associated Roles in .NET Core 2.1 Identity?

Get All Users with Associated Roles in .NET Core 2.1 Identity

Obtaining user information, including associated roles, is essential for user management tasks. .NET Core 2.1 Identity has a new approach for managing user roles, and this article explores how to achieve this goal.

Understanding the Change in IdentityUser

Previously, IdentityUser contained a Roles property to store associated role data. However, in .NET Core, this property has been removed. Instead, the strategy revolves around introducing new classes and relationships:

• ApplicationUserRole: A linking entity that connects ApplicationUser and ApplicationRole.
• ApplicationRole: A class representing a role.
• ApplicationUser: A class representing a user and now references ApplicationUserRole.

Implementing the Solution

To implement this solution, follow these steps:

1. Define the ApplicationUser class with an UserRoles property.
2. Create ApplicationUserRole and ApplicationRole classes.
3. Update the DBContext to handle the new entities and relationships.
4. Configure Identity in Startup with updated entity types.

Eager Loading for Role Data

To eagerly load the user's role information, use the following code:

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

Resolving the "Unknown Column" Error

If you encounter an error related to an "Unknown column," ensure that you have added the following code to your ApplicationDbContext's OnModelCreating method:

protected override void OnModelCreating(ModelBuilder builder)
{
    base.OnModelCreating(builder);

    // Define the relationships for ApplicationUserRole
    builder.Entity<ApplicationUserRole>(userRole =>
    {
        userRole.HasKey(ur => new { ur.UserId, ur.RoleId });
        ...
        // Additional relationship configuration goes here
    });
}

ASP.NET Core 2.2 Update

In ASP.NET Core 2.2 and later, there's an inherent difference in how IdentityUserRole is defined. It should inherit from IdentityUserRole instead of IdentityUserRole to avoid compilation errors.

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