FeatureSupport.GetVersionPresent Method (Object)


When overridden in a derived class, gets the version of the specified feature that is available on the system.

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

public abstract Version GetVersionPresent(
	object feature


Type: System.Object

The feature whose version is requested.

Return Value

Type: System.Version

A Version representing the version number of the specified feature available on the system; or null if the feature is not installed.

Version numbers consist of three parts: major, minor, and build. Typically, a version number is displayed as "major number.minor number.build number".

Notes to Inheritors:

When you inherit from FeatureSupport, you must override this 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 method. If the two feature parameters differ, you must also override IsPresent.

See OSFeature.GetVersionPresent for an implementation of this method.

The following code 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 requires that 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';
      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.";
      textBox1.Text += "Again, layered windows feature is not installed.";

.NET Framework
Available since 1.1
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