c# - 查找通用列表的方法以搜索特定的星期几

Question

我有一个 CallDay 对象的 Generic List，每个 CallDay 对象都有 DayOfWeek List 我想知道 DayOfWeek 列表是否包含特定的一天.这是我的 C# 代码

public class CallDays
{
    public CallDays();


    public List<DayOfWeek> DayOWList { get; set; }
    public bool EveryDayOfWeek { get; set; }
    public bool PublicHoliday { get; set; }
}



private void IdentifyDay(List<CallDays> callDayList)
{
    // Some condition to set DayOFWeek filter criteria

    DayOfWeek dayOfWeekToFind = drInMemory.Start.DayOfWeek;

    foreach (var item in CallDayList)
    {
        // Here I need to find whether item.DayOWList contains DayOfWeek which matches dayOfWeekToFind 
        item.DayOWList.Find
    }
}

Answer 1

您可以使用 Linq 查找包含它的第一个元素。因此，使用方法 FirstOrDefault 并在表达式上找到它，您可以检查 DayOWList 集合中是否有 DayOfWeek 对象，对于示例:

private void IdentifyDay(List<CallDays> callDayList)
{
    // Some condition to set DayOFWeek filter criteria

    DayOfWeek dayOfWeekToFind = drInMemory.Start.DayOfWeek;

    // find a object that contains the dayOfWeekToFind on the DayOWList collection
    CallDays result = CallDayList.FirstOrDefault(x => x.DayOWList.Any(d => d == dayOfWeekToFind));


    // you can use the result object here
}