performance optimization of

- AvaloniaObject.GetValue
- AvaloniaPropertyRegistry.IsRegistered
- AvaloniaProperty.GetMetadata

src/Avalonia.Base/AvaloniaObject.cs

@@ -261,25 +261,12 @@ namespace Avalonia
             }
             else
             {
-                object result = AvaloniaProperty.UnsetValue;
-                PriorityValue value;
-
                 if (!AvaloniaPropertyRegistry.Instance.IsRegistered(this, property))
                 {
                     ThrowNotRegistered(property);
                 }
 
-                if (_values.TryGetValue(property, out value))
-                {
-                    result = value.Value;
-                }
-
-                if (result == AvaloniaProperty.UnsetValue)
-                {
-                    result = GetDefaultValue(property);
-                }
-
-                return result;
+                return GetValueInternal(property);
             }
         }
 
@@ -767,7 +754,7 @@ namespace Avalonia
         {
             if (property.Inherits && _inheritanceParent != null)
             {
-                return _inheritanceParent.GetValue(property);
+                return (_inheritanceParent as AvaloniaObject).GetValueInternal(property);
             }
             else
             {
@@ -775,6 +762,32 @@ namespace Avalonia
             }
         }
 
+        /// <summary>
+        /// Gets a <see cref="AvaloniaProperty"/> value
+        /// without check for registered as this can slow getting the value
+        /// this method is intended for internal usage in AvaloniaObject only
+        /// it's called only after check the property is registered
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>The value.</returns>
+        private object GetValueInternal(AvaloniaProperty property)
+        {
+            object result = AvaloniaProperty.UnsetValue;
+            PriorityValue value;
+
+            if (_values.TryGetValue(property, out value))
+            {
+                result = value.Value;
+            }
+
+            if (result == AvaloniaProperty.UnsetValue)
+            {
+                result = GetDefaultValue(property);
+            }
+
+            return result;
+        }
+
         /// <summary>
         /// Given a <see cref="AvaloniaProperty"/> returns a registered avalonia property that is
         /// equal or throws if not found.
@@ -849,4 +862,4 @@ namespace Avalonia
             throw new ArgumentException($"Property '{p.Name} not registered on '{this.GetType()}");
         }
     }
-}
+}

src/Avalonia.Base/AvaloniaProperty.cs

@@ -26,6 +26,7 @@ namespace Avalonia
         private readonly Subject<AvaloniaPropertyChangedEventArgs> _changed;
         private readonly PropertyMetadata _defaultMetadata;
         private readonly Dictionary<Type, PropertyMetadata> _metadata;
+        private readonly Dictionary<Type, PropertyMetadata> _metadataCache = new Dictionary<Type, PropertyMetadata>();
 
         /// <summary>
         /// Initializes a new instance of the <see cref="AvaloniaProperty"/> class.
@@ -73,8 +74,8 @@ namespace Avalonia
         /// <param name="ownerType">The new owner type.</param>
         /// <param name="metadata">Optional overridden metadata.</param>
         protected AvaloniaProperty(
-            AvaloniaProperty source, 
-            Type ownerType, 
+            AvaloniaProperty source,
+            Type ownerType,
             PropertyMetadata metadata)
         {
             Contract.Requires<ArgumentNullException>(source != null);
@@ -163,11 +164,11 @@ namespace Avalonia
         /// object.
         /// </summary>
         /// <remarks>
-        /// When a property changes, change notifications are sent to all property subscribers; 
-        /// for example via the <see cref="AvaloniaProperty.Changed"/> observable and and the 
+        /// When a property changes, change notifications are sent to all property subscribers;
+        /// for example via the <see cref="AvaloniaProperty.Changed"/> observable and and the
         /// <see cref="AvaloniaObject.PropertyChanged"/> event. If this callback is set for a property,
         /// then it will be called before and after these notifications take place. The bool argument
-        /// will be true before the property change notifications are sent and false afterwards. This 
+        /// will be true before the property change notifications are sent and false afterwards. This
         /// callback is intended to support Control.IsDataContextChanging.
         /// </remarks>
         public Action<IAvaloniaObject, bool> Notifying { get; }
@@ -273,8 +274,8 @@ namespace Avalonia
                 defaultBindingMode: defaultBindingMode);
 
             var result = new StyledProperty<TValue>(
-                name, 
-                typeof(TOwner), 
+                name,
+                typeof(TOwner),
                 metadata,
                 inherits,
                 notifying);
@@ -423,24 +424,9 @@ namespace Avalonia
         /// </returns>
         public PropertyMetadata GetMetadata<T>() where T : IAvaloniaObject
         {
-            var type = typeof(T);
-
-            while (type != null)
-            {
-                PropertyMetadata result;
-
-                if (_metadata.TryGetValue(type, out result))
-                {
-                    return result;
-                }
-
-                type = type.GetTypeInfo().BaseType;
-            }
-
-            return _defaultMetadata;
+            return GetMetadata(typeof(T));
         }
 
-
         /// <summary>
         /// Gets the property metadata for the specified type.
         /// </summary>
@@ -448,22 +434,33 @@ namespace Avalonia
         /// <returns>
         /// The property metadata.
         /// </returns>
+        ///
         public PropertyMetadata GetMetadata(Type type)
         {
             Contract.Requires<ArgumentNullException>(type != null);
 
-            while (type != null)
+            PropertyMetadata result;
+            Type currentType = type;
+
+            if (_metadataCache.TryGetValue(type, out result))
             {
-                PropertyMetadata result;
+                return result;
+            }
 
-                if (_metadata.TryGetValue(type, out result))
+            while (currentType != null)
+            {
+                if (_metadata.TryGetValue(currentType, out result))
                 {
+                    _metadataCache[type] = result;
+
                     return result;
                 }
 
-                type = type.GetTypeInfo().BaseType;
+                currentType = currentType.GetTypeInfo().BaseType;
             }
 
+            _metadataCache[type] = _defaultMetadata;
+
             return _defaultMetadata;
         }
 
@@ -523,6 +520,7 @@ namespace Avalonia
             var baseMetadata = GetMetadata(type);
             metadata.Merge(baseMetadata, this);
             _metadata.Add(type, metadata);
+            _metadataCache.Clear();
         }
 
         [DebuggerHidden]
@@ -551,4 +549,4 @@ namespace Avalonia
             public override string ToString() => "(unset)";
         }
     }
-}
+}

src/Avalonia.Base/AvaloniaPropertyRegistry.cs

@@ -20,6 +20,12 @@ namespace Avalonia
         private readonly Dictionary<Type, Dictionary<int, AvaloniaProperty>> _registered =
             new Dictionary<Type, Dictionary<int, AvaloniaProperty>>();
 
+        /// <summary>
+        /// The registered properties by type cached values to increase performance.
+        /// </summary>
+        private readonly Dictionary<Type, Dictionary<int, AvaloniaProperty>> _registeredCache =
+            new Dictionary<Type, Dictionary<int, AvaloniaProperty>>();
+
         /// <summary>
         /// The registered attached properties by owner type.
         /// </summary>
@@ -103,21 +109,38 @@ namespace Avalonia
         /// </remarks>
         public AvaloniaProperty FindRegistered(Type type, AvaloniaProperty property)
         {
-            while (type != null)
+            Type currentType = type;
+            Dictionary<int, AvaloniaProperty> cache;
+            AvaloniaProperty result;
+
+            if (_registeredCache.TryGetValue(type, out cache))
+            {
+                if (cache.TryGetValue(property.Id, out result))
+                {
+                    return result;
+                }
+            }
+
+            while (currentType != null)
             {
                 Dictionary<int, AvaloniaProperty> inner;
 
-                if (_registered.TryGetValue(type, out inner))
+                if (_registered.TryGetValue(currentType, out inner))
                 {
-                    AvaloniaProperty result;
-
                     if (inner.TryGetValue(property.Id, out result))
                     {
+                        if (cache == null)
+                        {
+                            _registeredCache[type] = cache = new Dictionary<int, AvaloniaProperty>();
+                        }
+
+                        cache[property.Id] = result;
+
                         return result;
                     }
                 }
 
-                type = type.GetTypeInfo().BaseType;
+                currentType = currentType.GetTypeInfo().BaseType;
             }
 
             return null;
@@ -130,7 +153,7 @@ namespace Avalonia
         /// <param name="property">The property.</param>
         /// <returns>The registered property or null if not found.</returns>
         /// <remarks>
-        /// Calling AddOwner on a AvaloniaProperty creates a new AvaloniaProperty that is a 
+        /// Calling AddOwner on a AvaloniaProperty creates a new AvaloniaProperty that is a
         /// different object but is equal according to <see cref="object.Equals(object)"/>.
         /// </remarks>
         public AvaloniaProperty FindRegistered(object o, AvaloniaProperty property)
@@ -143,7 +166,7 @@ namespace Avalonia
         /// </summary>
         /// <param name="type">The type.</param>
         /// <param name="name">
-        /// The property name. If an attached property it should be in the form 
+        /// The property name. If an attached property it should be in the form
         /// "OwnerType.PropertyName".
         /// </param>
         /// <returns>
@@ -183,13 +206,12 @@ namespace Avalonia
             return results.FirstOrDefault(x => x.Name == propertyName);
         }
 
-
         /// <summary>
         /// Finds a registered property on an object by name.
         /// </summary>
         /// <param name="o">The object.</param>
         /// <param name="name">
-        /// The property name. If an attached property it should be in the form 
+        /// The property name. If an attached property it should be in the form
         /// "OwnerType.PropertyName".
         /// </param>
         /// <returns>
@@ -276,6 +298,8 @@ namespace Avalonia
                     inner.Add(property.Id, property);
                 }
             }
+
+            _registeredCache.Clear();
         }
     }
-}
+}