TimeZoneInfo.ConvertTimeFromUtc c# [英] TimeZoneInfo.ConvertTimeFromUtc c#

问题描述

var Result1 = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, TimeZoneInfo.Local)

var Result2 = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow,  TimeZoneInfo.FindSystemTimeZoneById(TimeZoneInfo.Local.Id));

这两者都将Utc时间转换为本地时间，这两种方法在结果或性能上有什么区别吗?

Both this convert Utc time to local time, is there any difference between this 2 different ways in result or performance?

哪个好?

为什么Microsoft在示例

why Microsoft not using TimeZoneInfo.Local directly(as for Result1) in sample here

推荐答案

唯一的区别是，第二种方法是绕行，方法是获取一个 TimeZoneInfo 对象，获取该对象的ID，然后查找再次使用ID来访问同一对象.

The only difference is that the second takes a detour by getting a TimeZoneInfo object, getting the id for it, and looking up the same object again using the id.

示例中的代码使用 FindSystemTimeZoneById 方法的原因是，它正在获取已知ID的 TimeZoneInfo 对象，而不是从<它已经具有的code> TimeZoneInfo 对象.

The reason that the code in the example is using the FindSystemTimeZoneById method is that it's getting the TimeZoneInfo object for a known id, it's not getting that id from a TimeZoneInfo object that it already has.

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