ASP.NET身份用户名（如何添加您自己的验证）？

Question

Does this property have any verification for itself by default? Like Max. length, etc.? If it does, where can it be found?

I'm asking, because i'm intending to override the UserName property to add more verification. Or should i add the verification in every ViewModel ?

Answer 1

You could just add a Model/ViewModel to handle this for you.

public class LoginViewModel
{
    [Required(ErrorMessage="*")]
    [StringLength(20, MinimumLength=5)]
    public string UserName { get; set; }

    [DataType(DataType.Password)]
    public string Password { get; set; }
}

This way, in your view, you can notify the user that the length etc does not match. Check out DataAnnotations here

EDIT Is this what you are trying to do? I have not tested this code!

public class ApplicationUser : IdentityUser
{
    public string UserName
    { 
        get; 
        set
        {
            //your validation here
        } 
    }
}

Answer 2

I believe the best way for you to enforce the change is at the core, ie at the model ApplicationUser level.

modelBuilder.Entity<ApplicationUser>().Property(t => t.Name).HasMaxLength(10);

This way the database is in sync with your view validations and future controllers are scaffolded correctly.