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OSFeature Class

Provides operating-system specific feature queries.

For a list of all members of this type, see OSFeature Members.

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

[Visual Basic]
Public Class OSFeature
   Inherits FeatureSupport
[C#]
public class OSFeature : FeatureSupport
[C++]
public __gc class OSFeature : public FeatureSupport
[JScript]
public class OSFeature extends FeatureSupport

Thread Safety

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

Remarks

Use the static (Shared in Visual Basic) 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.

Example

[Visual Basic, C#, C++] 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), 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.

[Visual Basic, C#, C++] This code assumes textBox1 has been created and placed on a form.

[Visual Basic] 
Private Sub LayeredWindows()
    ' Gets the version of the layered windows feature.
    Dim myVersion As Version = _
       OSFeature.Feature.GetVersionPresent(OSFeature.LayeredWindows)
       
    ' Prints whether the feature is available.
    If Not (myVersion Is Nothing) Then
        textBox1.Text = "Layered windows feature is installed." & _
           ControlChars.CrLf
    Else
        textBox1.Text = "Layered windows feature is not installed." & _
           ControlChars.CrLf
    End If 
    'This is an alternate way to check whether a feature is present.
    If OSFeature.Feature.IsPresent(OSFeature.LayeredWindows) Then
        textBox1.Text &= "Again, layered windows feature is installed."
    Else
        textBox1.Text &= "Again, layered windows feature is not installed."
    End If
End Sub


[C#] 
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.";
}


[C++] 
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 != 0)
       textBox1->Text = S"Layered windows feature is installed.\n";
    else
       textBox1->Text = S"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 = String::Concat( textBox1->Text, S"Again, layered windows feature is installed." );
    else
       textBox1->Text = String::Concat( textBox1->Text, S"Again, layered windows feature is not installed." );
 }
 

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Windows.Forms

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

See Also

OSFeature Members | System.Windows.Forms Namespace

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