/// <summary>
/// 判断当前用户名称是否存在。
/// </summary>
/// <param name="user">用户实例。</param>
/// <param name="cancellationToken">取消标志。</param>
/// <returns>返回判断结果。</returns>
public virtual async Task <IdentityResult> IsDuplicatedAsync(TUser user, CancellationToken cancellationToken = default)
{
if (user.UserName != null && await UserContext.AnyAsync(x => x.UserId != user.UserId && x.UserName == user.UserName, cancellationToken))
{
return(IdentityResult.Failed(ErrorDescriber.DuplicateUserName(user.UserName)));
}
if (user.NormalizedUserName != null && await UserContext.AnyAsync(x => x.UserId != user.UserId && x.NormalizedUserName == user.NormalizedUserName, cancellationToken))
{
return(IdentityResult.Failed(ErrorDescriber.DuplicateUserName(user.NormalizedUserName)));
}
return(IdentityResult.Success);
}