SpeechRecognizer 和 SpeechRecognitionEngine 的区别

 SpeechRecognizer 会直接调用系统的语音监听器。Choices 在其上可以正常工作。

 SpeechRecognitionEngine 则不会，但是更灵活。Choices 目前没好使过。DictationGrammar在其上可以正常运行。

但是

           GrammarBuilder grammarBuilder = new GrammarBuilder();
            grammarBuilder.Append(new Choices("张三"));
            grammarBuilder.Append(new Choices("李四"));
            grammarBuilder.Append(new Choices("王五"));
            grammarBuilder.Append(new Choices("局长"));
            Grammar g = new Grammar(grammarBuilder);
           g.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(g_SpeechRecognized);
            sh.SetGrammar(g);

        类似这样的代码就是没有反应。