系统.语音识别错误

我正在使用来自MS的system.speech编写语音识别程序。我一直在浏览有关 StackOverflow 的在线教程和所有重要信息，但我似乎一直遇到识别器似乎抛出错误的问题。

下面是我正在使用的代码（减去语法创建）。

Grammar grammarQuestionsSingle;
Grammar grammarQuestionsShort;
Grammar grammarQuestionsLong;
Grammar grammarStatement;
//Grammar grammarDeclarationShort;
//Grammar grammarDeclarationLong;
Grammar grammarCommandsSingle;
Grammar grammarCommandsShort;
Grammar grammarCommandsLong;
SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine();
CreateGrammar grammar = new CreateGrammar();
Think brain = new Think();
bool privacy, completed;
//bool timer;

public void OpenEars()
{
    completed = true;
    if (grammarQuestionsSingle == null || grammarQuestionsShort == null || grammarQuestionsLong == null || grammarStatement == null || grammarCommandsSingle == null || grammarCommandsShort == null || grammarCommandsLong == null)
    {
        grammarQuestionsSingle = grammar.createGrammarQuestionsSingle();
        grammarQuestionsShort = grammar.createGrammarQuestionsShort();
        grammarQuestionsLong = grammar.createGrammarQuestionsLong();
        grammarStatement = grammar.createGrammarStatement();
        grammarCommandsSingle = grammar.createGrammarCommandsSingle();
        grammarCommandsShort = grammar.createGrammarCommandsShort();
        grammarCommandsLong = grammar.createGrammarCommandsLong();
    }
    recognizer.RequestRecognizerUpdate();
    if (!grammarQuestionsSingle.Loaded)
    {
        recognizer.LoadGrammar(grammarQuestionsSingle);
    }
    if (!grammarQuestionsShort.Loaded)
    {
        recognizer.LoadGrammar(grammarQuestionsShort);
    }
    if (!grammarQuestionsLong.Loaded)
    {
        recognizer.LoadGrammar(grammarQuestionsLong);
    }
    if (!grammarStatement.Loaded)
    {
        recognizer.LoadGrammar(grammarStatement);
    }
    if (!grammarCommandsSingle.Loaded)
    {
        recognizer.LoadGrammar(grammarCommandsSingle);
    }
    if (!grammarCommandsShort.Loaded)
    {
        recognizer.LoadGrammar(grammarCommandsShort);
    }
    if (!grammarCommandsLong.Loaded)
    {
        recognizer.LoadGrammar(grammarCommandsLong);
    }
    DictationGrammar dictationGrammar = new DictationGrammar("grammar:dictation");
    dictationGrammar.Name = "DictationQuestion";
    recognizer.LoadGrammar(dictationGrammar);
    recognizer.RequestRecognizerUpdate();
    recognizer.SetInputToDefaultAudioDevice();
    Listening();
}
public void Listening()
{
    while (!completed)
    {
        Thread.Sleep(333);
    }
    recognizer.SpeechRecognized += recognizer_SpeechRecognized;
    recognizer.RecognizeAsync(RecognizeMode.Single);
}
private void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
    completed = false;
    SemanticValue sem = e.Result.Semantics;
    if (!privacy)
    {
        if (e.Result.Grammar.Name=="CommandsSingle" && sem["keyCommandsSingle"].Value.ToString() == "go to sleep")
        {
            privacy = true;
            brain.useMouth("ear muffs are on");
            completed = true;
            Listening();
        }
        else
        {
            brain.Understanding(sender, e);
            completed = true;
        }
    }
    else
    {
        if (e.Result.Grammar.Name == "CommandsSingle" && sem["keyCommandsSingle"].Value.ToString() == "wake up")
        {
            privacy = false;
            brain.useMouth("I am listening again");
            completed = true;
            Listening();
        }
    }
    completed = true;
    Listening();
}
}

它

正确识别第一个短语，但一旦它完成语音识别处理程序中的操作，它就会引发异常"在识别器执行识别时无法执行此操作"。我已经尝试过将识别全部用于一种方法，但是它具有相同的结果。这是我在发布此问题之前的最新尝试。我做错了什么？

至于澄清...

程序启动到系统托盘并调用此类。OpenEars（）.然后 OpenEars 调用类。listenening（） 具有 RecognizeAsync。说出第一个短语并且识别器正确听到它并遵循处理程序后，说出第二个短语时最终会触发异常。