RecognizerUpdateReachedEventArgs.UserToken 属性

定义

命名空间:

System.Speech.Recognition

程序集:

System.Speech.dll

包:

System.Speech v9.0.0-rc.2.24473.5

Source:

UpdateEventArgs.cs

获取在 UserToken 应用程序调用 RequestRecognizerUpdate 或 RequestRecognizerUpdate时传递给系统的 。

public:
 property System::Object ^ UserToken { System::Object ^ get(); };

public object UserToken { get; }

member this.UserToken : obj

Public ReadOnly Property UserToken As Object

属性值

Object

返回包含 的对象 UserToken。

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。 方法传入 String 参数的 对象， userToken 该对象描述应用程序在更新后将识别的内容。 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 SpeechRecognitionEngine.RecognizerUpdateReached 都会将 的内容 userToken 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 farmAnimals grammar  
        recognizer.LoadGrammar(farmAnimals);  

        // Start continuous, asynchronous recognition.  
        recognizer.RecognizeAsync(RecognizeMode.Multiple);  
        Console.WriteLine("Starting asynchronous recognition...");  
        Console.WriteLine("  Farm animals will now be recognized.");  
        Thread.Sleep(7000);  
        Console.WriteLine();  

        // Load the Fruit grammar.  
        string activeGrammars = "Farm animals and fruits will now be recognized.";  
        recognizer.RequestRecognizerUpdate(activeGrammars);  
        recognizer.LoadGrammarAsync(favoriteFruit);  
        Console.WriteLine();  
        Thread.Sleep(7000);  
        Console.WriteLine();  

        // Unload the Farm grammar.  
        string onlyFruit = "Only fruits will now be recognized.";  
        recognizer.RequestRecognizerUpdate(onlyFruit);  
        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, describe what the application will recognize next.  
    public static void recognizer_RecognizerUpdateReached(object sender, RecognizerUpdateReachedEventArgs e)  
    {  
      Console.WriteLine("  Update reached: " + e.UserToken);  
    }  

    // 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

应用程序通过调用采用 userToken 参数的 或 SpeechRecognizer.RequestRecognizerUpdate 方法之SpeechRecognitionEngine.RequestRecognizerUpdate一RecognizerUpdateReached来请求生成事件时指定 UserToken 。

另请参阅

• RecognizerUpdateReachedEventArgs
• RecognizerUpdateReached
• RecognizerUpdateReached
• RequestRecognizerUpdate()
• RequestRecognizerUpdate()