Initializes a new instance of the GrammarBuilder class from a set of alternatives.
Namespace:
Microsoft.Speech.Recognition
Assembly:
Microsoft.Speech (in Microsoft.Speech.dll)
Syntax
| Visual Basic (Declaration) |
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Public Sub New ( _ alternateChoices As Choices _ ) |
| Visual Basic (Usage) |
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Dim alternateChoices As Choices Dim instance As New GrammarBuilder(alternateChoices) |
| C# |
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public GrammarBuilder( Choices alternateChoices ) |
Parameters
- alternateChoices
- Type: Microsoft.Speech.Recognition..::..Choices
The set of alternatives.
Remarks
For more information about building a speech recognition grammar that contains alternatives, see Use a Choices Object to Create a GrammarBuilder (Microsoft.Speech).
Examples
The following example uses GrammarBuilder and Choices objects to construct a grammar that can recognize either of the two phrases, "Make background colorChoice" or "Set background to colorChoice".
The example uses a Choices object to create a list of acceptable values for colorChoice from an array of String objects. A Choices object is analogous to the one-of element in the SRGS specification, and contains a set of alternate phrases, any of which can be recognized when spoken. The example also uses a Choices object to group an array of two GrammarBuilder objects into a pair of alternative phrases that the resultant grammar can recognize. Alternate words or phrases are a component of most grammars, and the Choices object provides this functionality for grammars constructed with GrammarBuilder.
The example finally creates a Grammar object from a GrammarBuilder constructed from a Choices object.
| C# | Copy Code |
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private Grammar CreateColorGrammar()
{
// Create a set of color choices.
Choices colorChoice = new Choices(new string[] {"red", "green", "blue"});
GrammarBuilder colorElement = new GrammarBuilder(colorChoice);
// Create grammar builders for the two versions of the phrase.
GrammarBuilder makePhrase = new GrammarBuilder("Make background");
makePhrase.Append(colorElement);
GrammarBuilder setPhrase = new GrammarBuilder("Set background to");
setPhrase.Append(colorElement);
// Create a Choices for the two alternative phrases, convert the Choices
// to a GrammarBuilder, and construct the grammar from the result.
Choices bothChoices = new Choices(new GrammarBuilder[] {makePhrase, setPhrase});
Grammar grammar = new Grammar((GrammarBuilder)bothChoices);
grammar.Name = "backgroundColor";
return grammar;
}
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See Also
