SpeechRecognitionEngine.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 SpeechRecognitionEngine recognizer;
    public static void Main(string[] args)
    {

      // Initialize an in-process speech recognition engine and configure its input.
      using (recognizer = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US")))
      {
        recognizer.SetInputToDefaultAudioDevice();

        // 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.SpeechRecognitionRejected +=
          new EventHandler<SpeechRecognitionRejectedEventArgs>(recognizer_SpeechRecognitionRejected);

        // Load the Farm grammar.
        recognizer.LoadGrammar(farmAnimals);

        // Start asynchronous, continuous recognition.
        recognizer.RecognizeAsync(RecognizeMode.Multiple);
        Console.WriteLine("Starting asynchronous, continuous recognition");
        Console.WriteLine("  Farm grammar is loaded and enabled.");

        // 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(7000);

        // Request an update and unload the Farm grammar.
        recognizer.RequestRecognizerUpdate();
        recognizer.UnloadGrammar(farmAnimals);
        Thread.Sleep(7000);
      }

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

    // 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("  {0} grammar is loaded and {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);
    }

    // Write a message to the console when recognition fails.
    static void recognizer_SpeechRecognitionRejected(object sender, SpeechRecognitionRejectedEventArgs e)
    {
      Console.WriteLine("    Recognition attempt failed");
    }
  }
}

注解

应用程序必须使用 RequestRecognizerUpdate 暂停正在运行的 SpeechRecognitionEngine 实例，然后才能修改其设置或其 Grammar 对象。 在 SpeechRecognitionEngine 准备好接受修改时引发此事件。

例如，暂停 时SpeechRecognitionEngine，可以加载、卸载、启用和禁用Grammar对象，以及修改 、 InitialSilenceTimeout和 EndSilenceTimeout 属性的值BabbleTimeout。 有关更多信息，请参见 RequestRecognizerUpdate 方法。

创建 RecognizerUpdateReached 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

• RecognizerUpdateReachedEventArgs
• RequestRecognizerUpdate()
• SpeechDetectedEventArgs