win8程序中获取系统相关信息

const string RootContainer = "{00000000-0000-0000-FFFF-FFFFFFFFFFFF}";
const string RootQuery = "System.Devices.ContainerId:=\"" + RootContainer + "\"";
const string DeviceClassKey = "{A45C254E-DF1C-4EFD-8020-67D146A850E0},10";
const string DeviceDriverVersionKey = "{A8B865DD-2E3D-4094-AD97-E593A70C75D6},3";
const string HalDeviceClass = "4d36e966-e325-11ce-bfc1-08002be10318";

public static async Task<string> GetWindowsVersionAsync()
{
// There is no good place to get this.
// The HAL driver version number should work unless you're using a custom HAL... 
var hal = await GetHalDevice(DeviceDriverVersionKey);
if (hal == null || !hal.Properties.ContainsKey(DeviceDriverVersionKey))
return null;

var versionParts = hal.Properties[DeviceDriverVersionKey].ToString().Split('.');
return string.Join(".", versionParts.Take(2).ToArray());
}

private static async Task<PnpObject> GetHalDevice(params string[] properties)
{
var actualProperties = properties.Concat(new[] { DeviceClassKey });
var rootDevices = await PnpObject.FindAllAsync(PnpObjectType.Device,
actualProperties, RootQuery);
return rootDevices.FirstOrDefault(y => y.Properties
.Last().Value.ToString().Equals(HalDeviceClass));
}