close #361

src/Shared/HandyControl_Shared/Tools/Helper/ResourceHelper.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Reflection;
 using System.Windows;
 using HandyControl.Data;
+using HandyControl.Themes;
 
 namespace HandyControl.Tools
 {
@@ -85,5 +86,12 @@ namespace HandyControl.Tools
                 };
             }        
         }
+
+        public static Theme GetTheme(string name, ResourceDictionary resourceDictionary)
+        {
+            if (string.IsNullOrEmpty(name) || resourceDictionary == null) return null;
+            return resourceDictionary.MergedDictionaries.OfType<Theme>()
+                .FirstOrDefault(item => Equals(item.Name, name));
+        }
     }
 }