Ensured generated overridden properties are as simple as possible.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/AST/ClassExtensions.cs

@@ -88,6 +88,12 @@ namespace CppSharp.AST
             return null;
         }
 
+        public static bool HasNonAbstractBaseMethod(this Class @class, Method method)
+        {
+            var baseMethod = @class.GetBaseMethod(method, true, true);
+            return baseMethod != null && !baseMethod.IsPure;
+        }
+
         public static Property GetBaseProperty(this Class c, Property @override, bool onlyFirstBase = false, bool getTopmost = false)
         {
             foreach (var @base in c.Bases)
@@ -121,6 +127,12 @@ namespace CppSharp.AST
             return null;
         }
 
+        public static bool HasNonAbstractBaseProperty(this Class @class, Property property)
+        {
+            var baseProperty = @class.GetBaseProperty(property, true, true);
+            return baseProperty != null && !baseProperty.IsPure;
+        }
+
         public static Property GetPropertyByName(this Class c, string propertyName)
         {
             Property property = c.Properties.FirstOrDefault(m => m.Name == propertyName);

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -2327,11 +2327,9 @@ namespace CppSharp.Generators.CSharp
         private void GenerateVirtualPropertyCall(Function method, Class @class,
             Property property, List<Parameter> parameters = null)
         {
-            Property baseProperty;
             if (property.IsOverride && !property.IsPure &&
                 method.SynthKind != FunctionSynthKind.AbstractImplCall &&
-                (baseProperty = ((Class) method.Namespace).GetBaseProperty(property, true, true)) != null &&
-                !baseProperty.IsPure)
+                @class.HasNonAbstractBaseProperty(property))
             {
                 WriteLine(parameters == null ? "return base.{0};" : "base.{0} = value;", property.Name);
             }
@@ -2345,10 +2343,9 @@ namespace CppSharp.Generators.CSharp
 
         private void GenerateVirtualFunctionCall(Method method, Class @class)
         {
-            Method baseMethod;
-            if (method.IsOverride && !method.IsPure && method.SynthKind != FunctionSynthKind.AbstractImplCall &&
-                (baseMethod = ((Class) method.Namespace).GetBaseMethod(method, true, true)) != null &&
-                !baseMethod.IsPure)
+            if (method.IsOverride && !method.IsPure &&
+                method.SynthKind != FunctionSynthKind.AbstractImplCall &&
+                @class.HasNonAbstractBaseMethod(method))
             {
                 GenerateManagedCall(method, true);
             }