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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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0