如何獲得 WINDOWS 版本[C# 版]

using System;
using System.Runtime.InteropServices;

namespace GetWindowsVersion
{
[ StructLayout( LayoutKind.Sequential )]
public class OSVersionInfo
{
public int OSVersionInfoSize;
public int MajorVersion;
public int MinorVersion;
public int BuildNumber;
public int PlatformId;

[ MarshalAs( UnmanagedType.ByValTStr, SizeConst=128 )]
public String versionString;
}

[ StructLayout( LayoutKind.Sequential )]
public struct OSVersionInfo2
{
public int OSVersionInfoSize;
public int MajorVersion;
public int MinorVersion;
public int BuildNumber;
public int PlatformId;

[ MarshalAs( UnmanagedType.ByValTStr, SizeConst=128 )]
public String versionString;
}

public class LibWrap
{
[ DllImport( "kernel32" )]
public static extern bool GetVersionEx( [In, Out] OSVersionInfo osvi );

[ DllImport( "kernel32", EntryPoint="GetVersionEx" )]
public static extern bool GetVersionEx2( ref OSVersionInfo2 osvi );
}