如何在UWP App中获取当前登录用户的用户名或id

using Windows.Security.Authentication.OnlineId;

public async Task<string> GetCurrentUser()
{
    string currentUserName = string.Empty;

    OnlineIdAuthenticator authenticator = new OnlineIdAuthenticator();
    OnlineIdServiceTicketRequest ticketRequest = new OnlineIdServiceTicketRequest("wl.basic", "DELEGATION");
    
    try
    {
        OnlineIdServiceTicket ticket = await authenticator.GetTicketAsync(ticketRequest);
        if (ticket != null)
        {
            var properties = ticket.Properties;
            if (properties.ContainsKey("FirstName") && properties.ContainsKey("LastName"))
            {
                string firstName = properties["FirstName"] as string;
                string lastName = properties["LastName"] as string;
                currentUserName = $"{firstName} {lastName}";
            }
            else if (properties.ContainsKey("UserName"))
            {
                currentUserName = properties["UserName"] as string;
            }
        }
    }
    catch (Exception ex)
    {
        // 处理异常
    }

    return currentUserName;
}