一个蛮复杂的LINQ表达式

最近写了这么一个方法：

        //返回结果大致为：AAGP30PMDRVS56NK
        public string GetUsbDiskSnViaDriveLetter(string strUsbDiskDriveLetter)
        {
            var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_LogicalDiskToPartition");
            foreach (ManagementObject dm in searcher.Get())
            {
                //dm["Dependent"] 大致为：\\JIANG-PC\root\cimv2:Win32_LogicalDisk.DeviceID="H:"
                string strDriveLetter = getValueInQuotes(dm["Dependent"].ToString());
                if (strDriveLetter == strUsbDiskDriveLetter)
                {
                    //dm["Antecedent"] 大致为：\\JIANG-PC\root\cimv2:Win32_DiskPartition.DeviceID="Disk #1, Partition #0"
                    string[] diskArray = getValueInQuotes(dm["Antecedent"].ToString()).Split(',');
                    string driveNumber = diskArray[0].Remove(0, 6).Trim();
                    var disks = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive");
                    foreach (ManagementObject disk in disks.Get())
                    {
                        //disk["Name"] 大致为：\\.\PHYSICALDRIVE1
                        //disk["InterfaceType"] 大致为：USB
                        if (disk["Name"].ToString() == ("\\\\.\\PHYSICALDRIVE" + driveNumber) && disk["InterfaceType"].ToString() == "USB")
                        {
                            //disk["PNPDeviceID"] 大致为：USBSTOR\DISK&VEN_TECLAST&PROD_COOLFLASH(S)&REV_1100\AAGP30PMDRVS56NK&0
                            return parseSerialFromDeviceID(disk["PNPDeviceID"].ToString());
                        }
                    }
                }
            }
            return null;
        }

Resharper插件提示我这个可以转变为一个LINQ表达式，我想它会怎么转呢，于是点了一下，就变成了：

        //返回结果大致为：AAGP30PMDRVS56NK
        public string GetUsbDiskSnViaDriveLetter(string strUsbDiskDriveLetter)
        {
            var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_LogicalDiskToPartition");
            return (from ManagementObject dm in searcher.Get() let strDriveLetter = getValueInQuotes(dm["Dependent"].ToString()) where strDriveLetter == strUsbDiskDriveLetter select getValueInQuotes(dm["Antecedent"].ToString()).Split(',') into diskArray select diskArray[0].Remove(0, 6).Trim() into driveNumber let disks = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive") from ManagementObject disk in disks.Get() where disk["Name"].ToString() == ("\\\\.\\PHYSICALDRIVE" + driveNumber) && disk["InterfaceType"].ToString() == "USB" select parseSerialFromDeviceID(disk["PNPDeviceID"].ToString())).FirstOrDefault();
        }

代码貌似少多了，粗一看还以为这是别的语言，但坦白说可读性真差……长长的一行。

感觉Resharper也实在太智能了。