How to customize ASP.NET Identity Core Username to allow special characters and space

Question

I have changed my Register Action Method to accept user Name instead of Email.

if (ModelState.IsValid)
{
    var user = new ApplicationUser          


        

Answer 1

services.AddIdentity(options => { options.User.AllowedUserNameCharacters = String.Empty; options.User.RequireUniqueEmail = true; })
            .AddEntityFrameworkStores().AddDefaultTokenProviders();