WPF怎么设置Image.Source为资源图片

WPF如何设置Image.Source为资源图片
XAML里是Source="/GalaxyErp.Main;component/Images/btnMinimize.png"

现在应该要做最大化和还原按钮,请问如何用代码设置Image.Source=?

------解决方案--------------------
C# code
string realPath = string.Format(”/GalaxyErp.Main;component/Images/btnMinimize.png”);
                Uri pathUri = new Uri(realPath);
                System.Windows.Media.Imaging.BitmapImage bi = new System.Windows.Media.Imaging.BitmapImage();
                bi.BeginInit();
                bi.UriSource = pathUri;
                bi.EndInit();

                return bi;