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

You can set user validation rules configuring identity with options in your Startup.cs.

services.AddIdentity(options => {
    options.User.AllowedUserNameCharacters = "allowed characters here";
    options.User.RequireUniqueEmail = true/false;
});

Related resources:

Configure Identity