wpf 加载项目图片的几种写法

new System.Windows.Media.Imaging.BitmapImage(
                                                    new Uri("pack://application:,,,/TeacherAssistant.Themes;component/Images/CommonBig/kejianGray2.png")),

 new System.Windows.Media.Imaging.BitmapImage(
                                                    new Uri("/TeacherAssistant.Themes;component/Images/CommonBig/kejianGray.png", UriKind.Relative)),

 new System.Windows.Media.Imaging.BitmapImage(
                                                    new Uri("pack://application:,,,/TeacherAssistant.Themes;component/Images/CommonBig/kejianGray2.png", UriKind.Absolute)),