Fix getter creation for value type declaring types

DynamORM/Mapper/DynamicPropertyInvoker.cs

@@ -123,18 +123,21 @@ namespace DynamORM.Mapper
 
         private Func<object, object> CreateGetter(PropertyInfo property)
         {
-            if (property == null || !property.CanRead)
-                return null;
-
-            var objParm = Expression.Parameter(typeof(object), "o");
-
-            return Expression.Lambda<Func<object, object>>(
-                Expression.Convert(
-                    Expression.Property(
-                        Expression.TypeAs(objParm, property.DeclaringType),
-                        property.Name),
-                    typeof(object)), objParm).Compile();
-        }
+            if (property == null || !property.CanRead)
+                return null;
+
+            var objParm = Expression.Parameter(typeof(object), "o");
+            var target = property.DeclaringType.IsValueType
+                ? (Expression)Expression.Convert(objParm, property.DeclaringType)
+                : Expression.TypeAs(objParm, property.DeclaringType);
+
+            return Expression.Lambda<Func<object, object>>(
+                Expression.Convert(
+                    Expression.Property(
+                        target,
+                        property.Name),
+                    typeof(object)), objParm).Compile();
+        }
 
         private Action<object, object> CreateSetter(PropertyInfo property)
         {
@@ -276,4 +279,4 @@ namespace DynamORM.Mapper
 
         #endregion Type command cache
     }
-}
+}