ASP中的身份验证和授权.带有角色的.NET Web API

net web API with asp.net identity这是我的代码:

public class ApplicationUser : IdentityUser
{
    public string FullNamme { get; set; }
    public string ProfileType { get; set; }
    public ClaimsIdentity GenerateUserIdentity(ApplicationUserManager manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = manager.CreateIdentity(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here
        return userIdentity;
    }
    public Task<ClaimsIdentity> GenerateUserIdentityAsync(ApplicationUserManager manager)
    {
        return Task.FromResult(GenerateUserIdentity(manager));
    }
}
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("DefaultConnection", throwIfV1Schema: false)
    {
    }
    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }
}

我想根据public string ProfileType { get; set; }管理授权，如果它是客户或专业…类似于[Authorize(TypeProfile="xxx")]…如果这是不可能的，我怎么能添加简单的角色到我的代码，我怎么能定义默认的登录页面重定向，如果用户不是登录。