C# 判断Windows版本及CPU位数

class CheckWinVersion
{
int getOSArchitecture()
{
string pa = Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE");
return ((String.IsNullOrEmpty(pa) || String.Compare(pa, 0, "x86", 0, 3, true) == 0) ? 32 : 64);
}
string getOSInfo()
{
//Get Operating system information.
OperatingSystem os = Environment.OSVersion;
//Get version information about the os.
Version vs = os.Version;

//Variable to hold our return value
string operatingSystem = "";

if (os.Platform == PlatformID.Win32Windows)
{
//This is a pre-NT version of Windows
switch (vs.Minor)
{
case 0:
operatingSystem = "95";
break;
case 10:
if (vs.Revision.ToString() == "2222A")
operatingSystem = "98SE";
else
operatingSystem = "98";
break;
case 90:
operatingSystem = "Me";
break;
default:
break;
}
}
else if (os.Platform == PlatformID.Win32NT)
{
switch (vs.Major)
{
case 3:
operatingSystem = "NT 3.51";
break;
case 4:
operatingSystem = "NT 4.0";
break;
case 5:
if (vs.Minor == 0)
operatingSystem = "2000";
else
operatingSystem = "XP";
break;
case 6:
if (vs.Minor == 0)
operatingSystem = "Vista";
else
operatingSystem = "7";
break;
default:
break;
}
}
//Make sure we actually got something in our OS check
//We don't want to just return " Service Pack 2" or " 32-bit"
//That information is useless without the OS version.
if (operatingSystem != "")
{
//Got something.  Let's prepend "Windows" and get more info.
operatingSystem = "Windows " + operatingSystem;
//See if there's a service pack installed.
if (os.ServicePack != "")
{
//Append it to the OS name.  i.e. "Windows XP Service Pack 3"
operatingSystem += " " + os.ServicePack;
}
//Append the OS architecture.  i.e. "Windows XP Service Pack 3 32-bit"
operatingSystem += " " + getOSArchitecture().ToString() + "-bit";
}
//Return the information we've gathered.
return operatingSystem;
}
}