/// <summary>
/// Detect face and return the face id of a image file
/// </summary>
/// <param name="imageFile">
/// image file to detect face
/// </param>
/// <returns>face id</returns>
private async Task <Guid[]> DetectFacesFromImage(StorageFile imageFile)
{
var stream = await imageFile.OpenStreamForReadAsync();
var faces = await _faceApiClient.DetectAsync(stream);
if (faces == null || faces.Length < 1)
{
throw new FaceRecognitionException(FaceRecognitionExceptionType.NoFaceDetected);
}
return(FaceApiUtils.FacesToFaceIds(faces));
}
