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)

Public Interface IFeatureSupport


Retrieves the version of the specified feature.


Determines whether any version of the specified feature is currently available on the system.

System_CAPS_pubmethodIsPresent(Object, Version)

Determines whether the specified or newer version of the specified feature is currently available on the system.

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 null, 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 = _

    ' Prints whether the feature is available.
    If (myVersion IsNot Nothing) Then
        textBox1.Text = "Layered windows feature is installed." & _
        textBox1.Text = "Layered windows feature is not installed." & _
    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."
        textBox1.Text &= "Again, layered windows feature is not installed."
    End If
End Sub

.NET Framework
Available since 1.1
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