使用 .net 语音 API 在 SRGS 语法中引用外部规则时出错

Question

以下程序是一个简单的 C# 语音识别控制台应用程序，使用 Microsoft 托管语音 API，仅识别单词“是”和“否”。当我使用 Srgs 方法内联创建 Srgs 规则“MyRule”时，一切正常。但是，如果我将规则放入外部 XML 文件中并创建 SrgsRuleRef 来引用它，我总是会收到错误：“无法解析对导入语法的规则引用。”我尝试过更改各种参数，例如语言、媒体类型和语义标签格式，但似乎没有任何区别。

using System;
using System.Speech.Recognition;
using System.Speech.Recognition.SrgsGrammar;

namespace SpeechRecognitionConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                System.Globalization.CultureInfo culture = 
                    new System.Globalization.CultureInfo("en-US");
                SrgsRule RootRule = new SrgsRule("RootRule");
                RootRule.Add(new SrgsRuleRef(
                    new Uri("c:\\projects.net\\speechrecognitionconsole\\MyGrammar.xml"), "MyRule"));
                RootRule.Scope = SrgsRuleScope.Public;
                SrgsDocument MyDocument = new SrgsDocument(RootRule);
                MyDocument.Culture = culture;
                Grammar g = new Grammar(MyDocument);
                g.Name = ("MyGrammar");
                SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine(culture);
                recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>
                                               (recognizer_SpeechRecognized);
                recognizer.LoadGrammar(g);
                recognizer.SetInputToDefaultAudioDevice();
                recognizer.RecognizeAsync(RecognizeMode.Multiple);
                Console.WriteLine("Starting asynchronous recognition...");
                Console.Read();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            Console.WriteLine(e.Result.Text);
        }
    }
}

语法文件“c:\projects.net\speechrecognitionconsole\MyGrammar.xml”包含：

<?xml version="1.0" encoding="utf-8"?>
<grammar xml:lang="en-US" tag-format="semantics/1.0" version="1.0" xmlns="http://www.w3.org/2001/06/grammar">
  <rule id="MyRule" scope="public">
    <one-of>
      <item>yes</item>
      <item>no</item>
    </one-of>
  </rule>
</grammar>

Answer 1

为了今天使用 Visual Studio 2013 使其正常工作，我必须添加 root="MyRule" 不确定在 2012 年提出问题时相同的修复是否会有帮助。

<?xml version="1.0" encoding="utf-8"?>
<grammar xml:lang="en-US" tag-format="semantics/1.0"
 version="1.0" xmlns="http://www.w3.org/2001/06/grammar" root="MyRule">
  <rule id="MyRule" scope="public">
    <one-of>
      <item>yes</item>
      <item>no</item>
    </one-of>
  </rule>
</grammar>