如何在S#中将SID转换为帐户名称？

using System;
using System.Runtime.InteropServices;
using System.Security.Principal;

public static class SIDConverter
{
    [DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern bool LookupAccountSid(
        string lpSystemName,
        [MarshalAs(UnmanagedType.LPArray)] byte[] sid,
        System.Text.StringBuilder lpName,
        ref uint cchName,
        System.Text.StringBuilder ReferencedDomainName,
        ref uint cchReferencedDomainName,
        out SID_NAME_USE peUse);

    public static string ConvertSidToAccountName(string sidString)
    {
        SecurityIdentifier sid = new SecurityIdentifier(sidString);
        byte[] sidBytes = new byte[sid.BinaryLength];
        sid.GetBinaryForm(sidBytes, 0);

        uint cchName = 256;
        uint cchReferencedDomainName = 256;
        System.Text.StringBuilder name = new System.Text.StringBuilder((int)cchName);
        System.Text.StringBuilder domainName = new System.Text.StringBuilder((int)cchReferencedDomainName);
        SID_NAME_USE sidType;

        if (!LookupAccountSid(null, sidBytes, name, ref cchName, domainName, ref cchReferencedDomainName, out sidType))
        {
            throw new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error());
        }

        return domainName.ToString() + "\\" + name.ToString();
    }
}

using System;
using System.Management;

public static class SIDConverter
{
    public static string ConvertSidToAccountName(string sidString)
    {
        string accountName = "";

        try
        {
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(
                "SELECT * FROM Win32_UserAccount WHERE SID = '" + sidString + "'");

            foreach (ManagementObject account in searcher.Get())
            {
                accountName = account["Name"].ToString();
                break;
            }
        }
        catch (Exception ex)
        {
            throw new Exception("Error converting SID to account name: " + ex.Message);
        }

        return accountName;
    }
}