方法一:
buttonName.Background = Brushes.Red;
方法二:
buttonName.Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#FF3D3D3D"));
方法三:
buttonName.Background = new SolidColorBrush(Colors.White);
方法四:
var bc = new BrushConverter();
buttonName.Background = (Brush)bc.ConvertFrom("#FF3D3D3D");
方法五:
Brush br = new SolidColorBrush(Color.FromArgb(A, R, G, B));
buttonName.Background = br;