c# - Linq 选择当月日期​​所在的行

Question

我需要获取当月的数据。一直未能找到有效的解决方案。

这是我的代码，它为我提供了我需要的数据，但我得到的是整整一个月的数据，而不是我们所在的当前月份的数据。

我使用 row > DateTime.Today.Addmonths(-1) 选择了两次“限制”日期

有什么想法吗？

var userQuery = 
from timeEntry in TimeEntries
                                //this displays a month back, not current month TODO: change to current month.
where timeEntry.DateEntity > DateTime.Today.AddMonths(-1)
select new {
    UserName = timeEntry.User.FirstName + " " +timeEntry.User.LastName,
    HoursEntered = timeEntry.HoursEntered,       
    User = timeEntry.User
};

var localrows = userQuery.ToList();

var grouping = localrows.GroupBy(x => x.User);

var userList = grouping.Select(q => new {
    UserName = q.FirstOrDefault().UserName,
    Hours = q.Sum(hr => hr.HoursEntered),                 //AbsenceTypeID = holiday(1)                          // still takes from a whole month, instead of current month.
    Holiday = q.FirstOrDefault().User.Absences.Where(a => a.AbsenceTypeID == 1).Where(date => date.DateEntity > DateTime.Today.AddMonths(-1)).Count(),
});

编辑:

Keyur patel 的答案有效，但不适用于底部的答案。

所以我要为此感谢 Jules:

DateTime.Today.AddDays((DateTime.Today.Day -1) * -1)

Answer 1

尝试使用这个:

DateTime today = DateTime.Today;
var userQuery = 
from timeEntry in TimeEntries
where timeEntry.DateEntity.Month == today.Month && timeEntry.DateEntity.Year == today.Year
select new {
    UserName = timeEntry.User.FirstName + " " +timeEntry.User.LastName,
    HoursEntered = timeEntry.HoursEntered,       
    User = timeEntry.User
};

添加了对 .Year 的检查，因为它可能与其他年份的月份相匹配，如果有的话。

编辑

至于假期部分:

var userList = grouping.Select(q => new {
    UserName = q.FirstOrDefault().UserName,
    Hours = q.Sum(hr => hr.HoursEntered),
    Holiday = q.FirstOrDefault().User.Absences.Where(a => a.AbsenceTypeID == 1 && a.DateEntity.Month == today.Month && a.DateEntity.Year == today.Year).Count(),
});