奇怪的wpf拇指光标行为

重写/强制游标通常使用强制值完成。试试这样的。

FrameworkElement.CursorProperty.OverrideMetadata(
    typeof(ThumbOrMyThumbDerivedClass), 
    new FrameworkPropertyMetadata(
        null, 
        new CoerceValueCallback(MyHelperClassOrMyThumbderivedClass.CoerceCursor)));


private static object CoerceCursor(DependencyObject o, object value)
{
    if (/* conditions when to use the custom cursor */)
    {
        return CustomCursor;
    }

    return value;
}