FeatureSupport Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Provides static
methods for retrieving feature information from the current system.
public ref class FeatureSupport abstract : System::Windows::Forms::IFeatureSupport
public abstract class FeatureSupport : System.Windows.Forms.IFeatureSupport
type FeatureSupport = class
interface IFeatureSupport
Public MustInherit Class FeatureSupport
Implements IFeatureSupport
- Inheritance
-
FeatureSupport
- Derived
- Implements
Examples
The following example uses the OSFeature implementation of FeatureSupport 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:
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 != nullptr )
{
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 = String::Concat( textBox1->Text,
"Again, layered windows feature is installed." );
}
else
{
textBox1->Text = String::Concat( textBox1->Text,
"Again, layered windows feature is not installed." );
}
}
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 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
Remarks
Use the static
methods of this class when the classes you query for feature information implement the IFeatureSupport interface. Otherwise, inherit from FeatureSupport and provide your own implementation. For an implementation of this class, see OSFeature.
To get the version number of a feature, call GetVersionPresent. Call IsPresent to determine if a particular feature or version of a feature is installed.
Notes to Implementers
When you inherit from FeatureSupport, you must override the GetVersionPresent(String, String) method. When you override this method, check that the class that you use for the feature
parameter is the same as the class used for this parameter in the IsPresent(String, String) method. If the two feature
parameters differ, you also must override IsPresent(String, String).
Constructors
FeatureSupport() |
Initializes a new instance of the FeatureSupport class. |
Methods
Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
GetType() |
Gets the Type of the current instance. (Inherited from Object) |
GetVersionPresent(Object) |
When overridden in a derived class, gets the version of the specified feature that is available on the system. |
GetVersionPresent(String, String) |
Gets the version of the specified feature that is available on the system. |
IsPresent(Object) |
Determines whether any version of the specified feature is installed in the system. |
IsPresent(Object, Version) |
Determines whether the specified or newer version of the specified feature is installed in the system. |
IsPresent(String, String) |
Determines whether any version of the specified feature is installed in the system. This method is |
IsPresent(String, String, Version) |
Determines whether the specified or newer version of the specified feature is installed in the system. This method is |
MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
ToString() |
Returns a string that represents the current object. (Inherited from Object) |