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RecognitionEventArgs Class


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Provides information about speech recognition events.

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

public abstract class RecognitionEventArgs : EventArgs


Gets the recognition result data associated with the speech recognition event.


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


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


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


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


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


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

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

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.

.NET Framework
Available since 3.0

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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