RecognizeCompletedEventArgs RecognizeCompletedEventArgs RecognizeCompletedEventArgs RecognizeCompletedEventArgs Class


Provides data for the RecognizeCompleted event raised by a SpeechRecognitionEngine or a SpeechRecognizer object.

public ref class RecognizeCompletedEventArgs : System::ComponentModel::AsyncCompletedEventArgs
public class RecognizeCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs
type RecognizeCompletedEventArgs = class
    inherit AsyncCompletedEventArgs
Public Class RecognizeCompletedEventArgs
Inherits AsyncCompletedEventArgs


The following example performs asynchronous speech recognition on a speech recognition grammar, using the SpeechRecognitionEngine.RecognizeAsync method with the in-process recognizer. The example uses Choices and GrammarBuilder objects to create the speech recognition grammar before building it into a Grammar object. A handler for the SpeechRecognitionEngine.RecognizeCompleted event outputs information about the recognition operation to the console.

using System;  
using System.Speech.Recognition;  

namespace SampleRecognition  
  class Program  
    private static SpeechRecognitionEngine recognizer;  
    public static void Main(string[] args)  

      // Initialize a SpeechRecognitionEngine object and set its input.  
      recognizer = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US"));  

      // Configure recognition parameters.  
      recognizer.InitialSilenceTimeout = TimeSpan.FromSeconds(5.0);  
      recognizer.BabbleTimeout = TimeSpan.FromSeconds(3.0);  
      recognizer.EndSilenceTimeout = TimeSpan.FromSeconds(1.0);  
      recognizer.EndSilenceTimeoutAmbiguous = TimeSpan.FromSeconds(1.0);  

      // Add a handler for the LoadGrammarCompleted event.  
      recognizer.LoadGrammarCompleted +=  
        new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);  

      // Add a handler for the RecognizeCompleted event.  
      recognizer.RecognizeCompleted +=   
        new EventHandler<RecognizeCompletedEventArgs>(recognizer_RecognizeCompleted);  

      // Create a speech recognition grammar and build it into a Grammar object.  
      Choices bankingMenu = new Choices(new string[]   
      { "Access accounts", "Transfer funds", "Pay bills", "Get loan balance" });  
      GrammarBuilder banking = new GrammarBuilder(bankingMenu);  
      Grammar bankGrammar = new Grammar(banking);  
      bankGrammar.Name = "Banking Menu";  

      // Load the Grammar objects to the recognizer.  

      // Start asynchronous, continuous recognition.  

      // Keep the console window open.  

    // Handle the RecognizeCompleted event.  
    static void recognizer_RecognizeCompleted(object sender, RecognizeCompletedEventArgs e)  
      if (e.Error != null)  
          "RecognizeCompleted, error occurred during recognition: {0}", e.Error);  

      if (e.InitialSilenceTimeout || e.BabbleTimeout)  
          "RecognizeCompleted: BabbleTimeout({0}), InitialSilenceTimeout({1}).",  
          e.BabbleTimeout, e.InitialSilenceTimeout);  

      if (e.InputStreamEnded)  
          "RecognizeCompleted: AudioPosition({0}), InputStreamEnded({1}).",  
          e.AudioPosition, e.InputStreamEnded);  

      if (e.Result != null)  
          "RecognizeCompleted: Grammar ({0}), Text ({1}), Confidence ({2}), AudioPosition ({3}).",  
          e.Result.Grammar.Name, e.Result.Text, e.Result.Confidence, e.AudioPosition);  

        Console.WriteLine("RecognizeCompleted: No result.");  

      Console.WriteLine("Press any key to exit...");  

    // Handle the LoadGrammarCompleted event.   
    static void recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)  
      string grammarName = e.Grammar.Name;  
      bool grammarLoaded = e.Grammar.Loaded;  
      bool grammarEnabled = e.Grammar.Enabled;  

      if (e.Error != null)  
        Console.WriteLine("LoadGrammar for {0} failed with a {1}.",  
        grammarName, e.Error.GetType().Name);  

        // Add exception handling code here.  

      Console.WriteLine("Grammar {0} {1} loaded and {2} enabled.", grammarName,   
        (grammarLoaded) ? "is" : "is not", (grammarEnabled) ? "is" : "is not");  


An instance of RecognizeCompleted is created when the SpeechRecognitionEngine or the SpeechRecognizer object raises its SpeechRecognized event after completing a RecognizeAsync operation. For more information about speech recognition events, see Using Speech Recognition Events.


AudioPosition AudioPosition AudioPosition AudioPosition

Gets the location in the input device's audio stream associated with the RecognizeCompleted event.

BabbleTimeout BabbleTimeout BabbleTimeout BabbleTimeout

Gets a value that indicates whether a babble timeout generated the RecognizeCompleted event.

Cancelled Cancelled Cancelled Cancelled

Gets a value indicating whether an asynchronous operation has been canceled.

(Inherited from AsyncCompletedEventArgs)
Error Error Error Error

Gets a value indicating which error occurred during an asynchronous operation.

(Inherited from AsyncCompletedEventArgs)
InitialSilenceTimeout InitialSilenceTimeout InitialSilenceTimeout InitialSilenceTimeout

Gets a value that indicates whether an initial silence timeout generated the RecognizeCompleted event.

InputStreamEnded InputStreamEnded InputStreamEnded InputStreamEnded

Gets a value indicating whether the input stream ended.

Result Result Result Result

Gets the recognition result.

UserState UserState UserState UserState

Gets the unique identifier for the asynchronous task.

(Inherited from AsyncCompletedEventArgs)


Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
RaiseExceptionIfNecessary() RaiseExceptionIfNecessary() RaiseExceptionIfNecessary() RaiseExceptionIfNecessary()

Raises a user-supplied exception if an asynchronous operation failed.

(Inherited from AsyncCompletedEventArgs)
ToString() ToString() ToString() ToString()

Returns a string that represents the current object.

(Inherited from Object)

Applies to

See also