GrammarBuilder.AppendWildcard 方法
定义
重要
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为语法元素的当前顺序追加与任何输入匹配的识别语法元素。
public:
void AppendWildcard();public void AppendWildcard ();member this.AppendWildcard : unit -> unitPublic Sub AppendWildcard ()示例
以下示例创建一个语法，该语法接受密码输入作为通配符。 该示例将 Grammar.SpeechRecognized 事件处理程序附加到验证密码输入的语法。
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;
}
注解
通配符元素将添加到当前元素序列的末尾。
通配符元素与任何口述字词匹配。 它与背景噪音或静音不匹配。
