FeatureSupport Class

 

Provides static methods for retrieving feature information from the current system.

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

System.Object
  System.Windows.Forms.FeatureSupport
    System.Windows.Forms.OSFeature

public abstract class FeatureSupport : IFeatureSupport

NameDescription
System_CAPS_protmethodFeatureSupport()

Initializes a new instance of the FeatureSupport class.

NameDescription
System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodGetVersionPresent(Object)

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

System_CAPS_pubmethodSystem_CAPS_staticGetVersionPresent(String, String)

Gets the version of the specified feature that is available on the system.

System_CAPS_pubmethodIsPresent(Object)

Determines whether any version of the specified feature is installed in the system.

System_CAPS_pubmethodIsPresent(Object, Version)

Determines whether the specified or newer version of the specified feature is installed in the system.

System_CAPS_pubmethodSystem_CAPS_staticIsPresent(String, String)

Determines whether any version of the specified feature is installed in the system. This method is static.

System_CAPS_pubmethodSystem_CAPS_staticIsPresent(String, String, Version)

Determines whether the specified or newer version of the specified feature is installed in the system. This method is static.

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

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 Inheritors:

When you inherit from FeatureSupport, you must override the GetVersionPresent 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 also must override IsPresent.

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 != 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.";
}

.NET Framework
Available since 1.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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