<Grid>
     <InkCanvas Name="inkCanvas"/>

     <Button Content="识别" Click="Button_Click" VerticalAlignment="Bottom"/>
 </Grid>

引用内库

Ink ink = new Ink();
private void Button_Click(object sender, RoutedEventArgs e)
{
    using RecognizerContext recognizerContext = new RecognizerContext();

    recognizerContext.Strokes = ink.CreateStrokes();
    recognizerContext.Strokes.Add(CombineStroke());

    RecognitionResult result = recognizerContext.Recognize(out RecognitionStatus status);
    RecognitionAlternates als = result.GetAlternatesFromSelection();

    List<string> strs = new List<string>();
    for (int i = 0; i < als.Count; i++)
    {
        strs.Add(als[i].ToString());
    }
}

private Stroke CombineStroke()
{
    List<System.Drawing.Point> points = new List<System.Drawing.Point>();

    foreach (var item in this.inkCanvas.Strokes)
    {
        points.AddRange(
            item.StylusPoints.Select(p => new System.Drawing.Point((int)p.X, (int)p.Y)).ToList()
        );
    }

    Stroke stroke = ink.CreateStroke(points.ToArray());

    return stroke;
}