RecognitionEventArgs Class

Provides information about speech recognition events.

Namespace:  Microsoft.Speech.Recognition
Assembly:  Microsoft.Speech (in Microsoft.Speech.dll)

public abstract class RecognitionEventArgs : EventArgs

The Result property obtains the recognition information as a RecognitionResult object. For more information about speech recognition events, see Use Speech Recognition Events (Microsoft.Speech).

RecognitionEventArgs is the base for the following classes:

RecognitionEventArgs derives from EventArgs.

The following example attaches a handler for the SpeechHypothesized, SpeechRecognized, and SpeechRecognitionRejected events of the speech recognizer. The event argument types for the three events all derive from RecognitionEventArgs, which is used as the event data parameter in the handler.

// Initialize the speech recognizer.
private void Initialize(SpeechRecognitionEngine recognizer)
  // Attach handlers for the SpeechHypothesized, SpeechRecognitionRejected,
  // and SpeechRecognized events.
  recognizer.SpeechHypothesized +=
    new EventHandler<SpeechHypothesizedEventArgs>(DisplayResult);
  recognizer.SpeechRecognitionRejected +=
    new EventHandler<SpeechRecognitionRejectedEventArgs>(DisplayResult);
  recognizer.SpeechRecognized +=
    new EventHandler<SpeechRecognizedEventArgs>(DisplayResult);

  // Add other initialization code here.

// Handle the SpeechHypothesized, SpeechRecognitionRejected,
// and SpeechRecognized events.
private void DisplayResult(object sender, RecognitionEventArgs e)
  if (e is SpeechHypothesizedEventArgs)
    Console.WriteLine("Speech hypothesized:");
  else if (e is SpeechRecognitionRejectedEventArgs)
    Console.WriteLine("Speech recognition rejected:");
  else if (e is SpeechRecognizedEventArgs)
    Console.WriteLine("Speech recognized:");

  // Add code to handle the event.

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