public async Task ChangeEmailAsync(ChangeEmailModel parameters)
{
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
var user = await GetUserByEmailAsync(parameters.CurrentEmail);
if (user == null)
{
throw new HESException(HESCode.UserNotFound);
}
var exist = await GetUserByEmailAsync(parameters.NewEmail);
if (exist != null)
{
throw new HESException(HESCode.EmailAlreadyTaken);
}
var code = await _userManager.GenerateChangeEmailTokenAsync(user, parameters.NewEmail);
code = WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(code));
await _emailSenderService.SendUserConfirmEmailAsync(user.Id, parameters.NewEmail, code);
}