判断windows操作系统平台

判断当前Windows系统是win2000，winXP,winVista,win2003,win7...

private static IntPtr GetSysTrayWnd()
        {
            IntPtr handle = FindWindow("Shell_TrayWnd", null);
            handle = FindWindowEx(handle, IntPtr.Zero, "TrayNotifyWnd", null);

            if (IsWindowsXP || IsWindows2000 || IsWindows2003 || IsWindowsVista || IsWindows7)
            {
                if (IsWindows2000)
                {
                    handle = FindWindowEx(handle, IntPtr.Zero, "ToolbarWindow32", null);
                    return handle;
                }
                else
                {
                    handle = FindWindowEx(handle, IntPtr.Zero, "SysPager", null);
                    handle = FindWindowEx(handle, IntPtr.Zero, "ToolbarWindow32", null);
                    return handle;
                }
            }
            else
            {
                return handle;
            }
        }

public static bool IsWindows2000
        {
            get
            {
                return (Environment.OSVersion.Platform == PlatformID.Win32NT) && (Environment.OSVersion.Version.Major == ) && (Environment.OSVersion.Version.Minor == );
            }
        }

        //C#判断操作系统是否为WindowsXP
        public static bool IsWindowsXP
        {
            get
            {
                return (Environment.OSVersion.Platform == PlatformID.Win32NT) && (Environment.OSVersion.Version.Major == ) && (Environment.OSVersion.Version.Minor == );
            }
        }

        //C#判断操作系统是否为Windows2003
        public static bool IsWindows2003
        {
            get
            {
                return (Environment.OSVersion.Platform == PlatformID.Win32NT) && (Environment.OSVersion.Version.Major == ) && (Environment.OSVersion.Version.Minor == );
            }
        }

        //C#判断操作系统是否为WindowsVista
        public static bool IsWindowsVista
        {
            get
            {
                return (Environment.OSVersion.Platform == PlatformID.Win32NT) && (Environment.OSVersion.Version.Major == ) && (Environment.OSVersion.Version.Minor == );
            }
        }

        //C#判断操作系统是否为Windows7
        public static bool IsWindows7
        {
            get
            {
                return (Environment.OSVersion.Platform == PlatformID.Win32NT) && (Environment.OSVersion.Version.Major == ) && (Environment.OSVersion.Version.Minor == );
            }
        }