LINQ查询关闭我的WPF应用程序 [英] linq query close my wpf application

问题描述

我有一个wpf应用程序.当我运行它关闭.我调试了它，发现这个linq查询关闭了它(我不知道为什么！)

I have a wpf application. when I run it it close. I debugged it and I found that this linq query close it(I don't know why!)

TodayCards = cards.Where(i => (i.NextTime.Day == DateTime.Now.Day && i.NextTime.Month == DateTime.Now.Month && i.NextTime.Year == DateTime.Now.Year)).Select(i => i).ToList();

我也尝试过

TodayCards = cards.Where(i => (i.NextTime.Day == DateTime.Now.Day && i.NextTime.Month == DateTime.Now.Month && i.NextTime.Year == DateTime.Now.Year)).ToList();

但它关闭了这两种情况.

but it closed it both situations.

推荐答案

在至少一张卡上，NextTime很可能是null，或者cards本身是null.

Most likely NextTime is null on at least one card or cards itself is null.

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