System.Linq.Expressions.Expression.ValidateSwitchCaseType C# (CSharp) 메소드

        private static void ValidateSwitchCaseType(Expression @case, bool customType, Type resultType, string parameterName)
        {
            if (customType)
            {
                if (resultType != typeof(void))
                {
                    if (!TypeUtils.AreReferenceAssignable(resultType, @case.Type))
                    {
                        throw Error.ArgumentTypesMustMatch(parameterName);
                    }
                }
            }
            else
            {
                if (!TypeUtils.AreEquivalent(resultType, @case.Type))
                {
                    throw Error.AllCaseBodiesMustHaveSameType(parameterName);
                }
            }
        }
    }