This documentation is archived and is not being maintained.

IFeatureSupport Interface

Specifies a standard interface for retrieving feature information from the current system.

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

'Declaration
Public Interface IFeatureSupport
'Usage
Dim instance As IFeatureSupport

When implemented in a class, IFeatureSupport provides methods you can use to determine whether a feature is currently installed on the system and to get the version number of a feature. Call IsPresent to determine whether a feature, or a specific version of a feature, is currently installed. Call GetVersionPresent to determine the version number of an installed feature.

See the FeatureSupport and OSFeature classes for implementations of this interface.

The following example uses the OSFeature implementation of IFeatureSupport and queries for the LayeredWindows feature. The version is checked to see if it is Nothing, to determine whether the feature is present. The result is displayed in a text box. This code assumes textBox1 has been created and placed on a form.

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 (myVersion IsNot 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

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

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
Show: