OBTENIR LE NOM DETAILLE DU SYSTEME D'EXPLOITATION

using System;
using System.Text;
using System.Runtime.InteropServices;

namespace Xya
{
    /// <summary>
    /// Représente le nom et la version d'un système d'exploitation exécutant le Runtime .NET.
    /// </summary>
    public class OSVersion
	{
		#region Champs
		static OSVersion current;
		OSVERSIONINFOEX osVersion;
        PlatformID platform;
        string fullName;
        string name;
        string edition;
        string sp;
        Version version;
        Version spVersion;
		#endregion
		#region Propriétés
        /// <summary>
        /// Obtient la version du système d'exploitation utilisé.
        /// </summary>
        public static OSVersion Current
		{
			get
			{
				lock( typeof(OSVersion) )
				{
					if( current == null )
					{
						current = new OSVersion();
					}
					return current;
				}
			}
		}
        /// <summary>
        /// Obtient le nom complet du système d'exploitation utilisé, avec le nom, l'édition et le service pack installé si applicable.
        /// </summary>
        public string FullName
        {
            get
            {
                if( fullName == null )
                {
                    fullName = ToString();
                }
                return fullName;
            }
        }
        /// <summary>
        /// Obtient le nom du système d'exploitation utilisé.
        /// </summary>
        public string ProductName
        {
            get
            {
                return name;
            }
        }
        /// <summary>
        /// Obtient l'édition du système d'exploitation utilisé, si applicable.
        /// </summary>
        public string Edition
        {
            get
            {
                return edition;
            }
        }
        /// <summary>
        /// Obtient la plate-forme du système d'exploitation utilisé.
        /// </summary>
        public PlatformID Platform
        {
            get
            {
                return platform;
            }
        }
        /// <summary>
        /// Obtient le nom du service pack installé sur le système, si applicable.
        /// </summary>
        public string ServicePack
        {
            get
            {
                return sp;
            }
        }
        /// <summary>
        /// Obtient la version du système d'exploitation utilisé.
        /// </summary>
        public Version Version
        {
            get
            {
                return version;
            }
        }
        /// <summary>
        /// Obtient la version du service pack installé sur le système, si applicable.
        /// </summary>
        public Version ServicePackVersion
        {
            get
            {
                return spVersion;
            }
        }
		#endregion
		#region Constructeur
		private OSVersion() 
		{
            osVersion = new OSVERSIONINFOEX();
            osVersion.dwOSVersionInfoSize = Marshal.SizeOf( osVersion );
            GetVersionEx( ref osVersion );
            platform = (PlatformID)osVersion.dwPlatformId;
            version = new Version( osVersion.dwMajorVersion,
                osVersion.dwMinorVersion,
                osVersion.dwBuildNumber,
                0 );
            name = GetWindowsName();
            edition = GetWindowsEdition();
            if( osVersion.wServicePackMajor > 0 )
            {
                sp = osVersion.szCSDVersion;
                spVersion = new Version( osVersion.wServicePackMajor,
                    osVersion.wServicePackMinor,
                    0,
                    0 );
            }
            else
            {
                sp = null;
                spVersion = null;
            }
        }
		#endregion
		#region Appels P/Invoke
		private struct OSVERSIONINFOEX
		{
			public int dwOSVersionInfoSize;
			public int dwMajorVersion;
			public int dwMinorVersion;
			public int dwBuildNumber;
			public int dwPlatformId;
			[MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
			public string szCSDVersion;
			public short wServicePackMajor;
			public short wServicePackMinor;
			public short wSuiteMask;
			public byte wProductType;
			public byte wReserved;
		}

		[DllImport("kernel32.dll")]
		private static extern int GetVersionEx( [MarshalAs(UnmanagedType.Struct)] ref OSVERSIONINFOEX osinfo );
		private const int VER_NT_WORKSTATION  =						0x00000001;
		private const int VER_SUITE_ENTERPRISE  =					0x00000002;
		private const int VER_SUITE_BACKOFFICE =					0x00000004;
		private const int VER_SUITE_COMMUNICATIONS =				0x00000008;
		private const int VER_SUITE_TERMINAL =						0x00000010;
		private const int VER_SUITE_SMALLBUSINESS_RESTRICTED =		0x00000020;
		private const int VER_SUITE_EMBEDDEDNT =					0x00000040;
		private const int VER_SUITE_DATACENTER  =					0x00000080;
		private const int VER_SUITE_SINGLEUSERTS =					0x00000100;
		private const int VER_SUITE_PERSONAL =						0x00000200;
		private const int VER_SUITE_BLADE =							0x00000400;
		private const int VER_SUITE_EMBEDDED_RESTRICTED =			0x00000800;
		#endregion
		#region Implémentation
		private string GetWindowsName()
		{
			switch( (PlatformID)osVersion.dwPlatformId )
			{
				case PlatformID.Win32Windows:
				{
					//4.1.1998		Windows 98
					//4.1.2222		Windows 98 SE
					//4.9.3000		Windows ME
					switch( osVersion.dwMinorVersion )
					{
						case 1:
						{
							switch( osVersion.dwBuildNumber )
							{
								case 1998:
									return "Windows 98";
								case 2222:
									return "Windows 98 SE";
								default:
									return "Windows 98";
							}
						}
						case 9:
						{
							return "Windows ME";
						}
						default:
						{
                            return "Windows " + version.ToString();
                        }
					}
				}
				case PlatformID.Win32NT:
				{
					//4.0.1381		Windows NT 4.0
					//5.0.2195		Windows 2000
					//5.1.2600		Windows XP
					//5.2.3790		Windows Server 2003
					switch( osVersion.dwMajorVersion )
					{
						case 4:
						{
							return "Windows NT 4.0";
						}
						case 5:
						{
							switch( osVersion.dwMinorVersion )
							{
								case 0:
								{
									return "Windows 2000";
								}
								case 1:
								{
									return "Windows XP";
								}
								case 2:
								{
									return "Windows Server 2003";
								}
								default:
								{
                                    return "Windows NT " + version.ToString();
                                }
							}
						}
						default:
						{
                            return "Windows NT " + version.ToString();
                        }
					}
				}
				case PlatformID.WinCE:
				{
                    return "Windows CE " + version.ToString();
                }
				default:
				{
                    return "Windows " + version.ToString();
                }
			}
		}
        private string GetWindowsEdition()
        {
            string version = this.version.ToString();

            if( (osVersion.wSuiteMask & VER_SUITE_BLADE) == VER_SUITE_BLADE &&
                version.StartsWith( "5.2" ) )
            {
                //Windows Server 2003 Web Edition
               return "Web Edition";
            }
            else if( (osVersion.wSuiteMask & VER_SUITE_DATACENTER) == VER_SUITE_DATACENTER )
            {
                if( version.StartsWith( "5.0" ) )
                {
                    //Windows 2000 Datacenter Server
                    return "Datacenter Server";
                }
                else if( version.StartsWith( "5.2" ) )
                {
                    //Windows 2003 Datacenter Edition
                    return "Datacenter Edition";
                }
                else
                {
                    return "Datacenter Edition";
                }
            }
            else if( (osVersion.wSuiteMask & VER_SUITE_ENTERPRISE) == VER_SUITE_ENTERPRISE )
            {
                if( version.StartsWith( "4.0" ) )
                {
                    //Windows NT 4.0 Enterprise Edition
                    return "Enterprise Edition";
                }
                else if( version.StartsWith( "5.0" ) )
                {
                    //Windows 2000 Advanced Server
                    return "Advanced Server";
                }
                else if( version.StartsWith( "5.2" ) )
                {
                    //Windows 2003 Server Enterprise Edition
                    return "Enterprise Edition";
                }
                else
                {
                    return "Enterprise Edition";
                }
            }
            else if( osVersion.wProductType == VER_NT_WORKSTATION )
            {
                if( version.StartsWith( "4.0" ) )
                {
                    //Windows NT 4.0 Workstation
                    return "Workstation";
                }
                else if( version.StartsWith( "5.0" ) )
                {
                    //Windows 2000 Professional
                    return "Professional";
                }
                else if( version.StartsWith( "5.1" ) )
                {
                    if( (osVersion.wSuiteMask & VER_SUITE_PERSONAL) == VER_SUITE_PERSONAL )
                    {
                        //Windows XP Home Edition
                        return "Home Edition";
                    }
                    else
                    {
                        //Windows XP Professional
                        return "Professional";
                    }
                }
                else
                {
                    return "Workstation";
                }
            }
            else
            {
                return null;
            }
        }
        /// <summary>
        /// Obtient le nom complet du système d'exploitation utilisé.
        /// </summary>
        /// <returns> Nom complet du système d'exploitation utilisé. </returns>
        public override string ToString()
		{
            StringBuilder sb = new StringBuilder();

            sb.Append( name );
            if( edition != null )
            {
                sb.Append( ' ' );
                sb.Append( edition );
            }
            if( sp != null )
            {
                sb.Append( ' ' );
                sb.Append( sp );
            }
            return sb.ToString();
        }
		#endregion
	}
}