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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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