packages/MaterialDesignThemes.2.5.1/src/net45/PaletteHelper.cs

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using MaterialDesignColors;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace MaterialDesignThemes.Wpf
{
    public class PaletteHelper
    {
        public virtual void SetLightDark(bool isDark)
        {
            var existingResourceDictionary = Application.Current.Resources.MergedDictionaries
                .Where(rd => rd.Source != null)
                .SingleOrDefault(rd => Regex.Match(rd.Source.OriginalString, @"(\/MaterialDesignThemes.Wpf;component\/Themes\/MaterialDesignTheme\.)((Light)|(Dark))").Success);
            if (existingResourceDictionary == null)
                throw new ApplicationException("Unable to find Light/Dark base theme in Application resources.");

            var source =
                $"pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.{(isDark ? "Dark" : "Light")}.xaml";
            var newResourceDictionary = new ResourceDictionary() { Source = new Uri(source) };

            Application.Current.Resources.MergedDictionaries.Remove(existingResourceDictionary);
            Application.Current.Resources.MergedDictionaries.Add(newResourceDictionary);

            var existingMahAppsResourceDictionary = Application.Current.Resources.MergedDictionaries
                .Where(rd => rd.Source != null)
                .SingleOrDefault(rd => Regex.Match(rd.Source.OriginalString, @"(\/MahApps.Metro;component\/Styles\/Accents\/)((BaseLight)|(BaseDark))").Success);
            if (existingMahAppsResourceDictionary == null) return;

            source =
                $"pack://application:,,,/MahApps.Metro;component/Styles/Accents/{(isDark ? "BaseDark" : "BaseLight")}.xaml";
            var newMahAppsResourceDictionary = new ResourceDictionary { Source = new Uri(source) };

            Application.Current.Resources.MergedDictionaries.Remove(existingMahAppsResourceDictionary);
            Application.Current.Resources.MergedDictionaries.Add(newMahAppsResourceDictionary);
        }

        /// <summary>
        /// Replaces the entire palette
        /// </summary>
        public virtual void ReplacePalette(Palette palette)
        {
            if (palette == null) throw new ArgumentNullException(nameof(palette));

            var allHues = palette.PrimarySwatch.PrimaryHues.ToList();
            ReplacePrimaryColor(
                palette.PrimarySwatch, 
                allHues[palette.PrimaryLightHueIndex], 
                allHues[palette.PrimaryMidHueIndex],
                allHues[palette.PrimaryDarkHueIndex],
                allHues);

            var accentHue = palette.AccentSwatch.AccentHues.ElementAt(palette.AccentHueIndex);
            ReplaceEntry("SecondaryAccentBrush", new SolidColorBrush(accentHue.Color));
            ReplaceEntry("SecondaryAccentForegroundBrush", new SolidColorBrush(accentHue.Foreground));