GrammarBuilder.AppendWildcard 方法

public:
 void AppendWildcard();

public void AppendWildcard();

member this.AppendWildcard : unit -> unit

Public Sub AppendWildcard ()

範例

以下範例建立一個接受密碼輸入為萬用字元的文法。 範例中將 Grammar.SpeechRecognized 一個事件處理程式附加到文法中，用以驗證密碼輸入。

private Grammar CreatePasswordGrammar()
{
  GrammarBuilder wildcardBuilder = new GrammarBuilder();
  wildcardBuilder.AppendWildcard();
  SemanticResultKey passwordKey =
    new SemanticResultKey("Password", wildcardBuilder);

  GrammarBuilder passwordBuilder =
    new GrammarBuilder("My Password is");
  passwordBuilder.Append(passwordKey);

  Grammar passwordGrammar = new Grammar(passwordBuilder);
  passwordGrammar.Name = "Password input";

  passwordGrammar.SpeechRecognized +=
    new EventHandler<SpeechRecognizedEventArgs>(
      PasswordInputHandler);

  return passwordGrammar;
}

// Handle the SpeechRecognized event for the password grammar.
private void PasswordInputHandler(object sender, SpeechRecognizedEventArgs e)
{
  if (e.Result == null) return;

  RecognitionResult result = e.Result;
  SemanticValue semantics = e.Result.Semantics;

  if (semantics.ContainsKey("Password"))
  {
    RecognizedAudio passwordAudio =
      result.GetAudioForWordRange(
        result.Words[3], result.Words[result.Words.Count - 1]);

    if (IsValidPassword(passwordAudio))
    {
      Console.WriteLine("Password accepted.");

      // Add code to handle a valid password here.
    }
    else
    {
      Console.WriteLine("Invalid password.");

      // Add code to handle an invalid password here.
    }
  }
}

// Validate the password input.
private bool IsValidPassword(RecognizedAudio passwordAudio)
{
  Console.WriteLine("Validating password.");

  // Add password validation code here.

  return false;
}

備註

萬用符元素會被加入到目前元素序列的末尾。

萬用牌元素與任何口語詞相符。 它與背景噪音或寂靜不符。

另請參閱

• Append(Choices)
• AppendDictation()
• AppendRuleReference(String)