I know that the MahApps metro theme comes with "themes" (colour sets), but I don't know how to change them from the default settings in my WPF application.
I have followed the beginners tutorial at MahApps.Metro Documentation (including adding the resource libraries at the top of the page), but it makes no mention about changing the theme.
The component/Styles/Colours.xaml file has the comment "from the cosmopolitan theme pack", which may be a helpful clue to someone better versed in WPF design than me.
I'm talking about an app-wide theme change, not an individual control.
If you want to change the default colour scheme, just change which colour resource file is loaded.
from Blue:
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
to Red:
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Red.xaml" />
You can also change programatically (once you've loaded every colour resource file) using ThemeManager.ChangeTheme().
来源：https://stackoverflow.com/questions/15917657/changing-the-mahapps-metro-theme