Owin.Builder.AppBuilder.AddSignatureConversion C# (CSharp) Method

        private void AddSignatureConversion(Delegate conversion)
        {
            if (conversion == null)
            {
                throw new ArgumentNullException("conversion");
            }

            Type parameterType = GetParameterType(conversion);
            if (parameterType == null)
            {
                throw new ArgumentException(BuilderResources.Exception_ConversionTakesOneParameter, "conversion");
            }
            Tuple<Type, Type> key = Tuple.Create(conversion.Method.ReturnType, parameterType);
            _conversions[key] = conversion;
        }