SpeechRecognizer.RecognizerUpdateReached 事件

public:
 event EventHandler<System::Speech::Recognition::RecognizerUpdateReachedEventArgs ^> ^ RecognizerUpdateReached;

public event EventHandler<System.Speech.Recognition.RecognizerUpdateReachedEventArgs> RecognizerUpdateReached;

member this.RecognizerUpdateReached : EventHandler<System.Speech.Recognition.RecognizerUpdateReachedEventArgs> 

Public Custom Event RecognizerUpdateReached As EventHandler(Of RecognizerUpdateReachedEventArgs) 

Public Event RecognizerUpdateReached As EventHandler(Of RecognizerUpdateReachedEventArgs) 

事件类型

示例

以下示例演示加载和卸载 Grammar 对象的控制台应用程序。 应用程序使用 RequestRecognizerUpdate 方法请求语音识别引擎暂停，以便它可以接收更新。 然后，应用程序加载或卸载对象 Grammar 。

每次更新时，事件的处理程序 RecognizerUpdateReached 都会将当前加载 Grammar 对象的名称和状态写入控制台。 加载和卸载语法时，应用程序首先识别农场动物的名称，然后识别农场动物的名称和水果的名称，然后只识别水果的名称。

using System;  
using System.Speech.Recognition;  
using System.Collections.Generic;  
using System.Threading;  

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

      // Initialize a shared speech recognition engine.  
      recognizer = new SpeechRecognizer();  

      // Create the first grammar - Farm.  
      Choices animals = new Choices(new string[] { "cow", "pig", "goat" });  
      GrammarBuilder farm = new GrammarBuilder(animals);  
      Grammar farmAnimals = new Grammar(farm);  
      farmAnimals.Name = "Farm";  

      // Create the second grammar - Fruit.  
      Choices fruit = new Choices(new string[] { "apples", "peaches", "oranges" });  
      GrammarBuilder favorite = new GrammarBuilder(fruit);  
      Grammar favoriteFruit = new Grammar(favorite);  
      favoriteFruit.Name = "Fruit";  

      // Attach event handlers.  
      recognizer.SpeechRecognized +=  
        new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  
      recognizer.RecognizerUpdateReached +=  
        new EventHandler<RecognizerUpdateReachedEventArgs>(recognizer_RecognizerUpdateReached);  
      recognizer.StateChanged +=   
        new EventHandler<StateChangedEventArgs>(recognizer_StateChanged);  

      // Load the Farm grammar.  
      recognizer.LoadGrammar(farmAnimals);  
      Console.WriteLine("Grammar Farm is loaded");  

      // Pause to recognize farm animals.  
      Thread.Sleep(7000);  
      Console.WriteLine();  

      // Request an update and load the Fruit grammar.  
      recognizer.RequestRecognizerUpdate();  
      recognizer.LoadGrammarAsync(favoriteFruit);  
      Thread.Sleep(5000);  

      // Request an update and unload the Farm grammar.  
      recognizer.RequestRecognizerUpdate();  
      recognizer.UnloadGrammar(farmAnimals);  
      Thread.Sleep(5000);  

      // Keep the console window open.  
      Console.WriteLine();  
      Console.WriteLine("Press any key to exit...");  
      Console.ReadKey();  
    }  

    // Put the shared speech recognizer into "listening" mode.  
    static void recognizer_StateChanged(object sender, StateChangedEventArgs e)  
    {  
      if (e.RecognizerState != RecognizerState.Stopped)  
      {  
        recognizer.EmulateRecognizeAsync("Start listening");  
      }  
    }  

    // At the update, get the names and enabled status of the currently loaded grammars.  
    public static void recognizer_RecognizerUpdateReached(  
      object sender, RecognizerUpdateReachedEventArgs e)  
    {  
      Console.WriteLine();  
      Console.WriteLine("Update reached:");  
      Thread.Sleep(1000);  

      string qualifier;  
      List<Grammar> grammars = new List<Grammar>(recognizer.Grammars);  
      foreach (Grammar g in grammars)  
      {  
        qualifier = (g.Enabled) ? "enabled" : "disabled";  
        Console.WriteLine("  Grammar {0} is loaded and is {1}.",  
        g.Name, qualifier);  
      }  
    }  

    // Write the text of the recognized phrase to the console.  
    static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)  
    {  
      Console.WriteLine("  Speech recognized: " + e.Result.Text);  
    }  
  }  
}  

注解

应用程序必须使用 RequestRecognizerUpdate 来暂停正在运行的 SpeechRecognizer 实例，然后才能修改其 Grammar 对象。 例如，暂停 时 SpeechRecognizer ，可以加载、卸载、启用和禁用 Grammar 对象。 在 SpeechRecognizer 准备好接受修改时引发此事件。

为 RecognizerUpdateReached 事件创建委托时，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

• RequestRecognizerUpdate()
• RecognizerUpdateReachedEventArgs