检查对象是否存在然后根据规则设置它

发布于 2024-11-05 21:19:29 字数 355 浏览 2 评论 0原文

我有 2 个业务对象，行程和司机。每个行程都包含一个司机 ID 和一个司机日期 (MM/DD/YYYY)。

行程中可以有多个相同的 driver.driverid。我需要在与我当前所在的驱动程序的行程中获取最接近的 driver.driverid 实例。

例如，到目前为止我有以下内容：

var lookup = driver.driverid;

这是我正在查看的当前驱动程序（使用 foreach 来遍历驱动程序）对象 1 by 1)

我现在需要说的是获取具有相同 driverid 和最接近但不相等的过去日期的最近行程对象。如果不存在，则退出该方法。

谢谢

原文

I have 2 business objects, trip and driver.
Each contain a driver ID and a driver date (MM/DD/YYYY)

Trip can have multiple of the same driver.driverid's in it. I need to get the closest instance of the driver.driverid in trips to the driver I am currently in.

So for example I have the folling so far:

var lookup = driver.driverid;

This is the current driver I am looking at (using a foreach to go through the drivers object 1 by 1)

I now need to say get the most recent trip object that has the same driverid and the closest but not equal past date. If there is not one that exists, then exit the method.

Thanks

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极致的悲 2024-11-12 21:19:29

使用 LINQ 你可以做这样的事情（假设你的对象结构）；

 var selectedTrip = trips.Where(x => x.DriverId == desiredDriverId && x.TripDate > desiredDate).OrderBy(x => x.TripDate).FirstOrDefault();

 if(selectedTrip == null)
    return;

 // selectedTrip is your desired object

Using LINQ you could do something like this (assuming your object structure);

 var selectedTrip = trips.Where(x => x.DriverId == desiredDriverId && x.TripDate > desiredDate).OrderBy(x => x.TripDate).FirstOrDefault();

 if(selectedTrip == null)
    return;

 // selectedTrip is your desired object

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