在lambda表达式中转换嵌套for循环

Question

我是编程新手。任何人都可以告诉我如何在lambda表达式中转换这个for循环

for (int num = 0; num < daysNew.Count(); num++)
{
    for (int count = 0; count < daysOld.Count(); count++)
    {
        if (daysOld[count] == daysNew[num])
        {
            isValid = false;
            break;
        }
    }
}

Answer 1

这应该这样做：

bool isValid = !daysNew.Any(day => daysOld.Contains(day));

Answer 2

使用List.Any（）方法循环：

bool isValid = !daysNew.Any(day => daysOld.Contains(day));

或

bool isValid = !daysOld.Any(day => daysNew.Contains(day));

它将为“daysNew”中每个元素的每个元素检入“daysOld”