SpeechRecognitionEngine.LoadGrammarCompleted 事件

定义

命名空间:

System.Speech.Recognition

程序集:

System.Speech.dll

包:

System.Speech v9.0.0-preview.3.24172.9

Source:

SpeechRecognitionEngine.cs

当 SpeechRecognitionEngine 完成 Grammar 对象的异步加载时候引发。

public:
 event EventHandler<System::Speech::Recognition::LoadGrammarCompletedEventArgs ^> ^ LoadGrammarCompleted;

public event EventHandler<System.Speech.Recognition.LoadGrammarCompletedEventArgs> LoadGrammarCompleted;

member this.LoadGrammarCompleted : EventHandler<System.Speech.Recognition.LoadGrammarCompletedEventArgs> 

Public Event LoadGrammarCompleted As EventHandler(Of LoadGrammarCompletedEventArgs) 

事件类型

EventHandler<LoadGrammarCompletedEventArgs>

示例

以下示例创建进程内语音识别器，然后创建两种类型的语法，用于识别特定字词和接受自由听写。 该示例从每个已完成的语音识别语法构造一个 Grammar 对象，然后将对象异步加载 Grammar 到 SpeechRecognitionEngine 实例。 识别器和LoadGrammarCompletedSpeechRecognized事件的处理程序分别将用于执行识别结果的Grammar识别的对象的名称和文本写入控制台。

using System;  
using System.Speech.Recognition;  

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

      // Initialize an in-process speech recognition engine and set its input.  
      recognizer = new SpeechRecognitionEngine();  
      recognizer.SetInputToDefaultAudioDevice();  

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

      // Add a handler for the SpeechRecognized event.  
      recognizer.SpeechRecognized +=  
        new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  

      // Create the "yesno" grammar.  
      Choices yesChoices = new Choices(new string[] { "yes", "yup", "yeah" });  
      SemanticResultValue yesValue =  
          new SemanticResultValue(yesChoices, (bool)true);  
      Choices noChoices = new Choices(new string[] { "no", "nope", "neah" });  
      SemanticResultValue noValue =  
          new SemanticResultValue(noChoices, (bool)false);  
      SemanticResultKey yesNoKey =  
          new SemanticResultKey("yesno", new Choices(new GrammarBuilder[] { yesValue, noValue }));  
      Grammar yesnoGrammar = new Grammar(yesNoKey);  
      yesnoGrammar.Name = "yesNo";  

      // Create the "done" grammar.  
      Grammar doneGrammar =  
        new Grammar(new Choices(new string[] { "done", "exit", "quit", "stop" }));  
      doneGrammar.Name = "Done";  

      // Create a dictation grammar.  
      Grammar dictation = new DictationGrammar();  
      dictation.Name = "Dictation";  

      // Load grammars to the recognizer.  
      recognizer.LoadGrammarAsync(yesnoGrammar);  
      recognizer.LoadGrammarAsync(doneGrammar);  
      recognizer.LoadGrammarAsync(dictation);  

      // Start asynchronous, continuous recognition.  
      recognizer.RecognizeAsync(RecognizeMode.Multiple);  

      // Keep the console window open.  
      Console.ReadLine();  
    }  

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

      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.",  
      grammarName, (grammarLoaded) ? "is" : "is not");  
    }  

    // Handle the SpeechRecognized event.  
    static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)  
    {  
      Console.WriteLine("Grammar({0}): {1}", e.Result.Grammar.Name, e.Result.Text);  

      // Add event handler code here.  
    }  
  }  
}  

注解

识别器的方法 LoadGrammarAsync 启动异步操作。 在 SpeechRecognitionEngine 完成操作时引发此事件。 若要获取 Grammar 识别器加载的对象，请使用 Grammar 关联的 LoadGrammarCompletedEventArgs的 属性。 若要获取识别器已加载的当前 Grammar 对象，请使用识别器的 Grammars 属性。

如果识别器正在运行，应用程序必须使用 RequestRecognizerUpdate 在加载、卸载、启用或禁用语法之前暂停语音识别引擎。

创建 LoadGrammarCompleted 委托时，需要标识将处理该事件的方法。 若要将事件与事件处理程序关联，请将该委托的一个实例添加到事件中。 除非移除了该委托，否则每当发生该事件时就会调用事件处理程序。 有关事件处理程序委托的详细信息，请参阅 事件和委托。

另请参阅

• RecognizerUpdateReached
• Grammar
• LoadGrammarCompletedEventArgs
• LoadGrammarAsync(Grammar)
• Grammars