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OperatingSystem Class

Represents information about an operating system, such as the version and platform identifier. This class cannot be inherited.

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

public sealed class OperatingSystem : ICloneable, 

The OperatingSystem class contains information about an operating system. For example, the Environment.OSVersion property returns information about the currently executing operating system in an OperatingSystem object.

By design, the OperatingSystem class is not a general purpose means of describing an operating system, and you cannot derive a more inclusive type from the OperatingSystem class. If you need a type to contain other information about an operating system, create your own type, then include a field of type OperatingSystem and any additional fields, properties, or methods you require.

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


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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
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