This abstract base class provides a mechanism to determine whether particular features are supported by a particular class or object.

There methods to find out whether a particular feature or version of a feature IsPresent(), and another method to determine exactly which version of particular feature is available: GetVersionPresent().

The OSFeature class, derived from FeatureSupport, allows you to determine whether particular operating system features are present.

You can also derive your own classes from FeatureSupport (or the IFeatureSupport interface it implements) to give an indication of the features in your own frameworks. You have two design choices: you can either implement the IFeatureSupport interface on each of your objects that support feature presentation, in which case you can use the static versions of IsPresent() and GetVersionPresent(), or you can inherit from FeatureSupport and override the GetVersionPresent() and/or IsPresent() members that handle the feature information for arbitrary named classes.

public abstract class FeatureSupport : IFeatureSupport {
// Protected Constructors
   protected FeatureSupport();
// Public Static Methods
   public static Version GetVersionPresent(string featureClassName, string featureConstName);
   public static bool IsPresent(string featureClassName, string featureConstName);
   public static bool IsPresent(string featureClassName, string featureConstName, Version minimumVersion);
// Public Instance Methods
   public abstract Version GetVersionPresent(object feature);  // implements IFeatureSupport
   public virtual bool IsPresent(object feature);  // implements IFeatureSupport
   public virtual bool IsPresent(object feature, Version minimumVersion);  // implements IFeatureSupport
}

Subclasses

OSFeature