[WIP] Member instances

phirSOFT.ContextProperties/ContextProperty.cs

@@ -17,7 +17,7 @@ public ContextProperty(IContextPool<IContextProperty<TValue>, TValue> contextPoo
 
         public IContextPool<IContextProperty<TValue>, TValue> ContextPool { get; }
 
-        public IContextProvider<ContextProperty<TValue>, TValue> DefaultContext { get; set; }
+        public IContextProvider<IContextProperty<TValue>, TValue> DefaultContext { get; set; }
 
         public TValue this[object target, IContextProvider<IContextProperty<TValue>, TValue> context] => ContextPool[context]
             .First(c => c.OverridesValue(target, this)).GetValue(target, this);

phirSOFT.ContextProperties/IContextProperty.cs

@@ -0,0 +1,9 @@
+namespace phirSOFT.ContextProperties
+{
+    public interface IContextProperty<TValue>
+    {
+        TValue this[object instance, IContextProvider<IContextProperty<TValue>, TValue> context] { get; }
+
+        IContextProvider<IContextProperty<TValue>, TValue> DefaultContext { get; }
+    }
+}

phirSOFT.ContextProperties/IContextProvider.cs

@@ -7,8 +7,4 @@ public interface IContextProvider<in TProperty, out TValue> where TProperty : IC
         TValue GetValue(object targetObject, TProperty targetProperty);
         bool OverridesValue(object targetObject, TProperty targetProperty);
     }
-
-    public interface IContextProperty<TValue>
-    {
-    }
 }

phirSOFT.ContextProperties/IMemberContextProperty.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+using System.Text;
+
+namespace phirSOFT.ContextProperties
+{
+    /// <summary>
+    /// Provides a way to define a context property in an interface.
+    /// </summary>
+    /// <typeparam name="TValue">The type of the property in the interface.</typeparam>
+    public interface IMemberContextProperty<TValue>
+    {
+        TValue this[IContextProvider<IContextProperty<TValue>, TValue> context] { get; }
+
+        TValue Value { get; }
+    }
+}

phirSOFT.ContextProperties/MemberContextProperty.cs

@@ -0,0 +1,25 @@
+using System;
+
+namespace phirSOFT.ContextProperties
+{
+    /// <summary>
+    /// Implements the <see cref="IMemberContextProperty{TValue}"/>. This implementation does not keep the object alive.
+    /// </summary>
+    /// <typeparam name="TValue"></typeparam>
+    public class MemberContextProperty<TValue> : IMemberContextProperty<TValue>
+    {
+        private readonly IContextProperty<TValue> _contextProperty;
+        private readonly WeakReference _instance;
+
+        public MemberContextProperty(IContextProperty<TValue> contextProperty, object instance)
+        {
+            _contextProperty = contextProperty;
+            _instance = new WeakReference(instance);
+        }
+
+        public TValue this[IContextProvider<IContextProperty<TValue>, TValue> context] =>
+            _contextProperty[_instance, context];
+
+        public TValue Value => _contextProperty[_instance.Target, _contextProperty.DefaultContext];
+    }
+}