获取登录过的全部QQ号码

QQ会在我的文档创建一个文件夹里面有登录过的所有QQ的信息，文件夹的名称就是QQ号码，这个程序就是获取文件夹名称。
代码如下

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;namespace GetLogionedNumber
{internal class Program{[DllImport("Wtsapi32.dll")]protected static extern void WTSFreeMemory(IntPtr pointer);[DllImport("Wtsapi32.dll")]protected static extern bool WTSQuerySessionInformation(IntPtr hServer, int sessionId, WTSInfoClass wtsInfoClass, out IntPtr ppBuffer, out uint pBytesReturned);static void Main(string[] args){string userName = GetCurrentUserName().Split('\\')[1];//获取当前登录账户的用户名string path1 = @"C:\Users\" + userName + "\\Documents\\Tencent Files";//路径拼接GetLogionedQQNumber(path1);//根据路径获取到这个文件夹下文件夹的名称Console.ReadKey();//后面这三行看不懂，但是删了会报错Console.ReadKey();//Console.ReadKey();}//获取文件夹名称//path 路径private static void GetLogionedQQNumber(string path){string[] dirs = Directory.GetDirectories(path);List<string> list = new List<string>();foreach (string item in dirs){list.Add(Path.GetFileNameWithoutExtension(item));}Console.WriteLine("在这台电脑上登录过的QQ号有" + (list.Count - 1) + "个，分别为：");for (int i = 0; i < list.Count - 1; i++){Console.WriteLine(list[i]);}}/// <summary>/// 获取当前登录用户(可用于管理员身份运行)/// </summary>/// <returns></returns>private static string GetCurrentUserName(){IntPtr buffer;uint strLen;int cur_session = -1;var username = "SYSTEM"; // assume SYSTEM as this will return "\0" belowif (WTSQuerySessionInformation(IntPtr.Zero, cur_session, WTSInfoClass.WTSUserName, out buffer, out strLen) && strLen > 1){username = Marshal.PtrToStringAnsi(buffer); // don't need length as these are null terminated stringsWTSFreeMemory(buffer);if (WTSQuerySessionInformation(IntPtr.Zero, cur_session, WTSInfoClass.WTSDomainName, out buffer, out strLen) && strLen > 1){username = Marshal.PtrToStringAnsi(buffer) + "\\" + username; // prepend domain nameWTSFreeMemory(buffer);}}return username;}public enum WTSInfoClass{WTSInitialProgram,WTSApplicationName,WTSWorkingDirectory,WTSOEMId,WTSSessionId,WTSUserName,WTSWinStationName,WTSDomainName,WTSConnectState,WTSClientBuildNumber,WTSClientName,WTSClientDirectory,WTSClientProductId,WTSClientHardwareId,WTSClientAddress,WTSClientDisplay,WTSClientProtocolType,WTSIdleTime,WTSLogonTime,WTSIncomingBytes,WTSOutgoingBytes,WTSIncomingFrames,WTSOutgoingFrames,WTSClientInfo,WTSSessionInfo}}
}