GrammarBuilder.Addition Operator (String, GrammarBuilder)


Creates a new GrammarBuilder that contains a phrase followed by a GrammarBuilder.

Namespace:   System.Speech.Recognition
Assembly:  System.Speech (in System.Speech.dll)

public static GrammarBuilder operator +(
	string phrase,
	GrammarBuilder builder


Type: System.String

The first grammar element, which represents a sequence of words.

Type: System.Speech.Recognition.GrammarBuilder

The second grammar element.

Return Value

Type: System.Speech.Recognition.GrammarBuilder

Returns a GrammarBuilder for the sequence of the phrase parameter followed by the builder parameter.

GrammarBuilder supports conversions from the following classes.

This method accepts the objects listed above for the builder parameter. For more information, see the Implicit operators.

The following example creates a speech recognition grammar that can recognize the two phrases, "Make background color" and "Set background to color", where color is selected from a set of colors. Various types are used to build the final grammar, such as String, Choices, and GrammarBuilder objects.

private Grammar CreateColorGrammar()

  // Create a set of color choices.
  Choices colorChoice = new Choices(new string[] { "red", "green", "blue" });

  // Create grammar builders for the two versions of the phrase.
  GrammarBuilder makePhrase =
    (GrammarBuilder)"Make background" + colorChoice;
  GrammarBuilder setPhrase =
    "Set background to" + (GrammarBuilder)colorChoice;

  // Create a Choices for the two alternative phrases, convert the Choices
  // to a GrammarBuilder, and construct the Grammar object from the result.
  Choices bothChoices = new Choices(new GrammarBuilder[] { makePhrase, setPhrase });
  GrammarBuilder bothPhrases = new GrammarBuilder(bothChoices);

  Grammar grammar = new Grammar(bothPhrases);
  grammar.Name = "backgroundColor";
  return grammar;

.NET Framework
Available since 3.0
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