如何在C#中获取正确的夏令时时区偏移

using System;

string timeZoneId = "时区标识符";
DateTimeOffset dateTimeOffset = DateTimeOffset.Now;
TimeZoneInfo timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById(timeZoneId);
TimeSpan offset = timeZoneInfo.GetUtcOffset(dateTimeOffset.DateTime);

bool isDaylightSavingTime = timeZoneInfo.IsDaylightSavingTime(dateTimeOffset.DateTime);

if (isDaylightSavingTime)
{
    TimeSpan daylightOffset = timeZoneInfo.GetAdjustmentRules()[0].DaylightDelta;
    offset += daylightOffset;
}

using System;

class Program
{
    static void Main()
    {
        string timeZoneId = "时区标识符";
        DateTimeOffset dateTimeOffset = DateTimeOffset.Now;
        TimeZoneInfo timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById(timeZoneId);
        TimeSpan offset = timeZoneInfo.GetUtcOffset(dateTimeOffset.DateTime);

        bool isDaylightSavingTime = timeZoneInfo.IsDaylightSavingTime(dateTimeOffset.DateTime);
        if (isDaylightSavingTime)
        {
            TimeSpan daylightOffset = timeZoneInfo.GetAdjustmentRules()[0].DaylightDelta;
            offset += daylightOffset;
        }

        Console.WriteLine("夏令时时区偏移: " + offset);
    }
}