C#将DOMAIN\USER转换为USER @ DOMAIN

using System;
using System.DirectoryServices.AccountManagement;

class Program
{
    static void Main(string[] args)
    {
        string domainUser = "DOMAIN\\USER";
        string userDomain = ConvertDomainUserToUserDomain(domainUser);
        Console.WriteLine(userDomain);
    }

    static string ConvertDomainUserToUserDomain(string domainUser)
    {
        string[] parts = domainUser.Split('\\');
        string domain = parts[0];
        string user = parts[1];

        using (PrincipalContext context = new PrincipalContext(ContextType.Domain, domain))
        {
            UserPrincipal userPrincipal = UserPrincipal.FindByIdentity(context, user);
            if (userPrincipal != null)
            {
                return $"{userPrincipal.DisplayName} @ {domain}";
            }
        }

        return null;
    }
}