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SpeechRecognizer.PreloadGrammarsAsync method

4/5/2013

Loads all grammars in the speech grammar set.

Syntax


public IAsyncAction PreloadGrammarsAsync()

Parameters

This method has no parameters.

Return value

Type: IAsyncAction

The result of the asynchronous action.

Remarks

For speech recognition to work with custom grammars, each grammar must be added, loaded, and used by the RecognizeAsync method. AddGrammarFromList, AddGrammarFromUri and AddGrammarFromPredefinedType add a grammar to an internal queue, but the grammars are not yet in a loaded state. Grammars are loaded in one of two ways: you can call PreloadGrammarsAsync prior to calling RecognizeAsync, or you can skip calling PreloadGrammarsAsync and RecognizeAsync will call it for you. The same delay occurs in both cases, but leaving the burden to RecognizeAsync means that the delay will occur when a user attempts speech recognition, and there is a higher chance they will notice the delay. For this reason, unless you have only a few simple grammars, you may wish to call this method.

Requirements

Minimum supported client	None supported
Minimum supported server	None supported
Minimum supported phone	Windows Phone 8
Namespace	Windows.Phone.Speech.Recognition Windows::Phone::Speech::Recognition [C++]
Metadata	Windows.winmd
Capabilities	ID_CAP_SPEECH_RECOGNITION [Windows Phone] ID_CAP_MICROPHONE [Windows Phone] ID_CAP_NETWORKING [Windows Phone]

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