SpeechRecognitionEngine RecognizeCompleted事件不会触发

Question

我一直在寻找这个问题，但我找不到任何有用的东西。 我想从wav文件中执行连续语音识别using System.Speech.Recognition;但是，我希望在识别引擎完成其工作时返回结果。 我找到了solution来使用RecognizeCompleted事件处理程序，但它根本不会触发。 识别码：

        SpeechRecognitionEngine speechRecognitionEngine = null;
        bool completed = false;
        // create the engine
        speechRecognitionEngine = createSpeechEngine("en-GB");

        // hook to events
        speechRecognitionEngine.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(engine_SpeechRecognized);
        speechRecognitionEngine.RecognizeCompleted += new EventHandler<RecognizeCompletedEventArgs>(recognizer_RecognizeCompleted);

        // load dictionary
        speechRecognitionEngine.LoadGrammar(new DictationGrammar());
        speechRecognitionEngine.SetInputToWaveFile("C:\\Converted Audio\\BBC1 cut sport.wav");

        // start listening for continuous speech recognition 
        speechRecognitionEngine.RecognizeAsync(RecognizeMode.Multiple);

        while (!completed)
        {
            Thread.Sleep(333);
        }

事件处理程序代码：

void recognizer_RecognizeCompleted(object sender, RecognizeCompletedEventArgs e)
    {
        completed = true;
    }