Mono.CSharp.NamespaceEntry.LookupExtensionMethod C# (CSharp) Method

		public IList<MethodSpec> LookupExtensionMethod (TypeSpec extensionType, string name, int arity, ref NamespaceEntry scope)
		{
			List<MethodSpec> candidates = null;
			foreach (Namespace n in GetUsingTable ()) {
				var a = n.LookupExtensionMethod (extensionType, RootContext.ToplevelTypes, name, arity);
				if (a == null)
					continue;

				if (candidates == null)
					candidates = a;
				else
					candidates.AddRange (a);
			}

			scope = parent;
			if (candidates != null)
				return candidates;

			if (parent == null)
				return null;

			//
			// Inspect parent namespaces in namespace expression
			//
			Namespace parent_ns = ns.Parent;
			do {
				candidates = parent_ns.LookupExtensionMethod (extensionType, RootContext.ToplevelTypes, name, arity);
				if (candidates != null)
					return candidates;

				parent_ns = parent_ns.Parent;
			} while (parent_ns != null);

			//
			// Continue in parent scope
			//
			return parent.LookupExtensionMethod (extensionType, name, arity, ref scope);
		}

        ///
        /// Does extension methods look up to find a method which matches name and extensionType.
        /// Search starts from this namespace and continues hierarchically up to top level.
        ///
        public IList <MethodSpec> LookupExtensionMethod(TypeSpec extensionType, string name, int arity, ref NamespaceEntry scope)
        {
            List <MethodSpec> candidates = null;

            foreach (Namespace n in GetUsingTable())
            {
                var a = n.LookupExtensionMethod(extensionType, RootContext.ToplevelTypes, name, arity);
                if (a == null)
                {
                    continue;
                }

                if (candidates == null)
                {
                    candidates = a;
                }
                else
                {
                    candidates.AddRange(a);
                }
            }

            scope = parent;
            if (candidates != null)
            {
                return(candidates);
            }

            if (parent == null)
            {
                return(null);
            }

            //
            // Inspect parent namespaces in namespace expression
            //
            Namespace parent_ns = ns.Parent;

            do
            {
                candidates = parent_ns.LookupExtensionMethod(extensionType, RootContext.ToplevelTypes, name, arity);
                if (candidates != null)
                {
                    return(candidates);
                }

                parent_ns = parent_ns.Parent;
            } while (parent_ns != null);

            //
            // Continue in parent scope
            //
            return(parent.LookupExtensionMethod(extensionType, name, arity, ref scope));
        }