C#获取U盘序列号的方法

using system.management;
private list<string> _serialnumber = new list<string>();
/// <summary>
/// 调用这个函数将本机所有u盘序列号存储到_serialnumber中
/// </summary>
private void matchdriveletterwithserial()
{
  string[] diskarray;
  string drivenumber;
  var searcher = new managementobjectsearcher("select * from win32_logicaldisktopartition");
  foreach (managementobject dm in searcher.get())
  {
    getvalueinquotes(dm["dependent"].tostring());
    diskarray = getvalueinquotes(dm["antecedent"].tostring()).split(',');
    drivenumber = diskarray[0].remove(0, 6).trim();
    var disks = new managementobjectsearcher("select * from win32_diskdrive");
    foreach (managementobject disk in disks.get())
    {
      if (disk["name"].tostring() == ("\\\\.\\physicaldrive" + drivenumber) & disk["interfacetype"].tostring() == "usb")
      {
        _serialnumber.add(parseserialfromdeviceid(disk["pnpdeviceid"].tostring()));
      }
    }
  }
}
private static string parseserialfromdeviceid(string deviceid)
{
  var splitdeviceid = deviceid.split('\\');
  var arraylen = splitdeviceid.length - 1;
  var serialarray = splitdeviceid[arraylen].split('&');
  var serial = serialarray[0];
  return serial;
}
private static string getvalueinquotes(string invalue)
{
  var posfoundstart = invalue.indexof("\"");
  var posfoundend = invalue.indexof("\"", posfoundstart + 1);
  var parsedvalue = invalue.substring(posfoundstart + 1, (posfoundend - posfoundstart) - 1);
  return parsedvalue;
}

matchdriveletterwithserial();
string[] aa = _serialnumber.toarray();
for (int i = 0; i < aa.length; i++)
{
  aa[i].tostring(); //这里就可以拿出现在所有的u盘序列号
}