[英]Linq Select row Where date in Current month
我需要從當月獲取數據。找不到有效的解決方案。
這是我的代碼,它為我提供了我需要的數據,但我從一整個月前獲取數據,而不是從我們所在的當月獲取數據。
我用row > DateTime.Today.Addmonths(-1)
兩次選擇了日期“限制”
有任何想法嗎 ?
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(),
});
編輯:
Keyur Patel 的回答有效,但不是最底層的。
所以我必須為此感謝 Jules:
DateTime.Today.AddDays((DateTime.Today.Day -1) * -1)
嘗試使用這個:
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.Year
的檢查,因為它可能與其他年份的月份匹配(如果有的話)。
編輯
至於假期部分:
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(),
});
您可以像這樣簡單地比較日期的月份部分:
timeEntry.DateEntity.Month == DateTime.Now.Month
您可以使用 DateTime 類的Month
和Year
屬性,如下所示:
var userQuery = TimeEntries
.Where (te => te.DateEntity.Month == DateTime.Today.Month && te.DateEntity.Year == DateTime.Today.Year)
.Select(timeEntry =>
new {
UserName = timeEntry.User.FirstName + " " + timeEntry.User.LastName,
HoursEntered = timeEntry.HoursEntered,
User = timeEntry.User
}
);
你可以試試這個: .Where(x => x.EntityDate >= new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1));
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