Priority Property
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Grammar.Priority Property

Gets or sets the priority value of a Grammar object.

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

public int Priority { get; set; }

Property Value

Type: System.Int32
The priority of the referenced speech recognition grammar. The range is from -128 and 127, inclusive. The default is 0.

The Priority property is used to select a grammar when more than one grammar will produce an identical recognition result. If a speech recognizer has more than one speech recognition grammar loaded and enabled that match the input, and the match is the best result from the recognizer, then the recognizer uses the grammar that has the highest Priority. If the grammars that produce the identical recognition result also have the same Priority value, then the grammar that the recognizer uses is undefined.

The following example creates two Grammar objects, one for digits and one for fractions. The Grammar objects are assigned names and relative weights and priorities, and loaded by a speech recognizer. The CreateDigitsGrammar, CreateFractionsGrammar, and recognizer_SpeechRecognized methods are not shown here.

// Create a Grammar for recognizing numeric digits.
Grammar digitsGrammar = CreateDigitsGrammar();
digitsGrammar.Name = "Digits Grammar";
digitsGrammar.Priority = 2;
digitsGrammar.Weight = 0.6f;

// Create a Grammar for recognizing fractions.
Grammar fractionsGrammar = CreateFractionsGrammar();
fractionsGrammar.Name = "Fractions Grammar";
fractionsGrammar.Priority = 1;
fractionsGrammar.Weight = 1f;

// Create a speech recognizer.
SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine();

recognizer.SpeechRecognized +=
  new EventHandler<SpeechRecognizedEventArgs>(
    recognizer_SpeechRecognized);

// Load the digits and fractions Grammar objects.
recognizer.LoadGrammar(digitsGrammar);
recognizer.LoadGrammar(fractionsGrammar);

// Start recognition.
recognizer.SetInputToDefaultAudioDevice();
recognizer.RecognizeAsync(RecognizeMode.Multiple);
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