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OSFeature Class

Provides operating-system specific feature queries.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public class OSFeature : FeatureSupport
public class OSFeature extends FeatureSupport
public class OSFeature extends FeatureSupport
Not applicable.

Use the static instance of this class provided in the Feature property to query for operating system features. You cannot create an instance of this class.

To determine the version of a feature, call the GetVersionPresent method. To determine if a feature or a specific version is present, call the IsPresent method and specify the feature to look for with the feature identifiers provided in this class.

The following example uses OSFeature to query the operating system to determine if the LayeredWindows feature is installed. The example presents two different ways of checking to see whether the feature is present. In the first method, myVersion is checked to see if it is a null reference (Nothing in Visual Basic). If the version is a null reference (Nothing in Visual Basic), the feature is not installed. In the second method, the example calls the base class method IsPresent to see if the feature is installed. The results are displayed in a text box.

This code assumes textBox1 has been created and placed on a form.

private void LayeredWindows() {
   // Gets the version of the layered windows feature.
   Version myVersion = OSFeature.Feature.GetVersionPresent(OSFeature.LayeredWindows);

   // Prints whether the feature is available.
   if (myVersion != null)
      textBox1.Text = "Layered windows feature is installed." + '\n';
   else
      textBox1.Text = "Layered windows feature is not installed." + '\n';

   // This is an alternate way to check whether a feature is present.
   if (OSFeature.Feature.IsPresent(OSFeature.LayeredWindows))
      textBox1.Text += "Again, layered windows feature is installed.";
   else
      textBox1.Text += "Again, layered windows feature is not installed.";
}


private void LayeredWindows()
{
    // Gets the version of the layered windows feature.
    Version myVersion = OSFeature.get_Feature().GetVersionPresent
        (OSFeature.LayeredWindows);

    // Prints whether the feature is available.
    if (myVersion != null) {
        textBox1.set_Text("Layered windows feature is installed." 
            + '\n');
    }
    else {
        textBox1.set_Text("Layered windows feature is not installed." 
            + '\n');
    }

    // This is an alternate way to check whether a feature is present.
    if (OSFeature.get_Feature().IsPresent(OSFeature.LayeredWindows)) {
        textBox1.set_Text(textBox1.get_Text()
            + "Again, layered windows feature is installed.");
    }
    else {
        textBox1.set_Text(textBox1.get_Text() 
            + "Again, layered windows feature is not installed.");
    }
} //LayeredWindows 

System.Object
   System.Windows.Forms.FeatureSupport
    System.Windows.Forms.OSFeature

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 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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