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FeatureSupport.IsPresent Method (Object)

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

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public virtual bool IsPresent (
	Object feature
)
public boolean IsPresent (
	Object feature
)
public function IsPresent (
	feature : Object
) : boolean

Parameters

feature

The feature to look for.

Return Value

true if the feature is present; otherwise, false.

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 must also override IsPresent.

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 a null reference (Nothing in Visual Basic), 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';
   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 void LayeredWindows()
{
    // Gets the version of the layered windows feature.
    Version myVersion = OSFeature.get_Feature().GetVersionPresent
        (OSFeature.LayeredWindows);

    // Prints whether the feature is available.
    if (myVersion != null) {
        textBox1.set_Text("Layered windows feature is installed." 
            + '\n');
    }
    else {
        textBox1.set_Text("Layered windows feature is not installed." 
            + '\n');
    }

    // This is an alternate way to check whether a feature is present.
    if (OSFeature.get_Feature().IsPresent(OSFeature.LayeredWindows)) {
        textBox1.set_Text(textBox1.get_Text()
            + "Again, layered windows feature is installed.");
    }
    else {
        textBox1.set_Text(textBox1.get_Text() 
            + "Again, layered windows feature is not installed.");
    }
} //LayeredWindows 

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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