//引入命名空间
using System;

public class Example
{
   public static void Main()
   {
      var os = Environment.OSVersion;
      Console.WriteLine("Current OS Information:\n");
      Console.WriteLine("Platform: {0:G}", os.Platform);
      Console.WriteLine("Version String: {0}", os.VersionString);
      Console.WriteLine("Version Information:");
      Console.WriteLine("   Major: {0}", os.Version.Major);
      Console.WriteLine("   Minor: {0}", os.Version.Minor);
      Console.WriteLine("Service Pack: '{0}'", os.ServicePack);
   }
}
// If run on a Windows 8.1 system, the example displays output like the following:
//       Current OS Information:
//
//       Platform: Win32NT
//       Version String: Microsoft Windows NT 6.2.9200.0
//       Version Information:
//          Major: 6
//          Minor: 2
//       Service Pack: ''
// If run on a Windows 7 system, the example displays output like the following:
//       Current OS Information:
//
//       Platform: Win32NT
//       Version String: Microsoft Windows NT 6.1.7601 Service Pack 1
//       Version Information:
//          Major: 6
//          Minor: 1
//       Service Pack: 'Service Pack 1'