ABP.NET CORE 框架 取消新增用户邮箱地址必填验证

1、Core层：  User.cs 实体类中，重写EmailAddress设置可为空类型；

 [Required(AllowEmptyStrings = true)]    //允许空字符串
public override string EmailAddress { get; set; }

2、Application层： 还有Dto那边EmailAddress 属性也设置允许可空字符串  ；

3、Core层: UserManager类中重写 CheckDuplicateUsernameOrEmailAddressAsync 方法

  public override async Task<IdentityResult> CheckDuplicateUsernameOrEmailAddressAsync(long? expectedUserId, string userName, string emailAddress)
        {
            var user = (await FindByNameAsync(userName));
            if (user != null && user.Id != expectedUserId)
            {
                throw new UserFriendlyException(string.Format(L("Identity.DuplicateUserName"), userName));
            }

            if (!string.IsNullOrEmpty(emailAddress))
            {
                user = (await FindByEmailAsync(emailAddress));
                if (user != null && user.Id != expectedUserId)
                {
                    throw new UserFriendlyException(string.Format(L("Identity.DuplicateEmail"), emailAddress));
                }
            }

            return IdentityResult.Success;
        }

4、EntityFrameworkCore层： 修改Context类  ，插入这段，设置EmailAddress允许为空； 

 protected override void OnModelCreating(ModelBuilder modelBuilder)
  {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Entity<User>().Property(a => a.EmailAddress).IsRequired(false);
  }

5、 更新数据库：打开程序包管理控制台  输入Add-Migration + 更新内容， 然后输入 Update-DataBase ；