Initial

BrightSharp/ThemeManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace BrightSharp
+{
+    public enum ColorThemes
+    {
+        Classic,
+        DevLab,
+        Silver,
+        Blue,
+        DarkBlue
+    }
+
+    public static class ThemeManager
+    {
+        private const string StyleDictionaryPattern = @"(?<=.+style\.)(.*?)(?=\.xaml)";
+        public static ColorThemes Theme
+        {
+            get
+            {
+                var curStyleRes = Resources.Where(r => r.Source != null &&
+                        Regex.IsMatch(r.Source.OriginalString, StyleDictionaryPattern, RegexOptions.IgnoreCase)).FirstOrDefault();
+                if (curStyleRes == null) return ColorThemes.Classic;
+                var match = Regex.Match(curStyleRes.Source.OriginalString, StyleDictionaryPattern, RegexOptions.IgnoreCase);
+                return (ColorThemes)Enum.Parse(typeof(ColorThemes), match.Value, true);
+            }
+            set
+            {
+                var curStyleRes = Resources.Where(r => r.Source != null &&
+                        Regex.IsMatch(r.Source.OriginalString, StyleDictionaryPattern, RegexOptions.IgnoreCase)).FirstOrDefault();
+                if (curStyleRes != null)
+                    Resources.Remove(curStyleRes);
+                if (value == ColorThemes.Classic)
+                    return;
+                Resources.Add(new ResourceDictionary()
+                {
+                    Source = new Uri($"/brightsharp;component/style.{value}.xaml", UriKind.RelativeOrAbsolute)
+                });
+            }
+        }
+        private static ICollection<ResourceDictionary> Resources
+        {
+            get { return Application.Current.Resources.MergedDictionaries; }
+        }
+    }
+
+}