SpeechRecognizer.PreloadGrammarsAsync method

Loads all grammars in the speech grammar set.

Syntax

public IAsyncAction PreloadGrammarsAsync()

Public Function PreloadGrammarsAsync() As IAsyncAction

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

See also

SpeechRecognizer