This documentation is archived and is not being maintained.

OperatingSystem Constructor

Initializes a new instance of the OperatingSystem class, using the specified platform identifier value and version object.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public OperatingSystem(
	PlatformID platform,
	Version version


Type: System.PlatformID
One of the PlatformID values that indicates the operating system platform.
Type: System.Version
A Version object that indicates the version of the operating system.


version is null.


platform is not a PlatformID enumeration value.

The following code example creates objects of the OperatingSystem class with selected values for the Platform and Version properties.

// Example for the OperatingSystem constructor and the 
// OperatingSystem.ToString( ) method.
using System;

class OpSysConstructDemo 
    // Create and display an OperatingSystem object.
    static void BuildOSObj( PlatformID pID, Version ver )
        OperatingSystem os = new OperatingSystem( pID, ver );

        Console.WriteLine( "   {0}", os.ToString( ) );

    static void BuildOperatingSystemObjects( )
        // The Version object does not need to correspond to an 
        // actual OS version.
        Version verNull     = new Version( );
        Version verMajMin   = new Version( 3, 11 );
        Version verMMBld    = new Version( 5, 25, 625 );
        Version verMMBVer   = new Version( 5, 6, 7, 8 );
        Version verString   = new Version( "" );

        // All PlatformID members are shown here.
        BuildOSObj( PlatformID.Win32NT, verNull );
        BuildOSObj( PlatformID.Win32S, verMajMin );
        BuildOSObj( PlatformID.Win32Windows, verMMBld );
        BuildOSObj( PlatformID.WinCE, verMMBVer );
        BuildOSObj( PlatformID.Win32NT, verString );

    public static void Main( ) 
            "This example of the OperatingSystem constructor " +
            "and \nOperatingSystem.ToString( ) " +
            "generates the following output.\n" );
            "Create and display several different " +
            "OperatingSystem objects:\n" );

        BuildOperatingSystemObjects( );

            "\nThe OS version of the host computer is:\n\n   {0}", 
            Environment.OSVersion.ToString( ) );

This example of the OperatingSystem constructor and
OperatingSystem.ToString( ) generates the following output.

Create and display several different OperatingSystem objects:

   Microsoft Windows NT 0.0
   Microsoft Win32S 3.11
   Microsoft Windows 98 5.25.625
   Microsoft Windows CE
   Microsoft Windows NT

The OS version of the host computer is:

   Microsoft Windows NT 5.1.2600.0

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.