private int CalculateArgumentScore(IType parameterType, IType argumentType)
{
if (parameterType == argumentType || (TypeSystemServices.IsSystemObject(argumentType) && TypeSystemServices.IsSystemObject(parameterType)))
{
return(parameterType is ICallableType ? CallableExactMatchScore : ExactMatchScore);
}
if (TypeCompatibilityRules.IsAssignableFrom(parameterType, argumentType))
{
var callableType = parameterType as ICallableType;
var callableArg = argumentType as ICallableType;
if (callableType != null && callableArg != null)
{
return(CalculateCallableScore(callableType, callableArg));
}
return(UpCastScore);
}
if (TypeSystemServices.FindImplicitConversionOperator(argumentType, parameterType) != null)
{
return(ImplicitConversionScore);
}
if (TypeSystemServices.CanBeReachedByPromotion(parameterType, argumentType))
{
return(IsWideningPromotion(parameterType, argumentType) ? WideningPromotion : NarrowingPromotion);
}
if (MyDowncastPermissions().CanBeReachedByDowncast(parameterType, argumentType))
{
return(DowncastScore);
}
return(-1);
}