ASP.NET 用户名与密码约束规则

"Microsoft.AspNet.Identity.EntityFramework" version="2.2.3" targetFramework="net48" 

修改IdentityModels.cs文件

    public class UserManager : UserManager<ApplicationUser>
    {
        public UserManager()
            : base(new UserStore<ApplicationUser>(new ApplicationDbContext()))
        {
            //PasswordValidator = new MinimumLengthValidator(8);
            PasswordValidator = new PasswordValidator
            {
                RequiredLength = 8,
                RequireNonLetterOrDigit = true,
                RequireDigit = true,
                RequireLowercase = true,
                RequireUppercase = true,
            };
            UserValidator = new UserValidator<ApplicationUser>(this)
            { AllowOnlyAlphanumericUserNames = false };
        }
    }

高亮部分为密码和用户名约束条件设置

参考：

密码约束规则：https://docs.microsoft.com/en-us/previous-versions/aspnet/dn613295(v=vs.108)?redirectedfrom=MSDN

用户名约束规则：https://docs.microsoft.com/zh-cn/previous-versions/visualstudio/dn468202(v=vs.111)