Check the CountEmailChart carefully. Here I am taking input of DateTime which is fully formatted date with time. But the problem is I want to compare only the date, not time, on Entity Framework below to count number of rows. Can anyone tell me how I can do this?
Controller code:
public int CountEmailChart(DateTime date, int campaignID)
{
int count = dbcontext.CampaignEmails
.Count(x => x.DateSigned == date && x.CampaignID == campaignID);
return count;
}
Karan's answer is correct but resulting query won't use an index for DateSigned. If a such index exist (or combined index for CampaignID and DateSigned columns) you may prefer this approach:
var startDate = date.Date;
var endDate = date.Date.AddDay(1);
int count = dbcontext.CampaignEmails.Count(x => x.CampaignID == campaignID && x.DateSigned >= startDate && x.DateSigned < endDate);
Try like this. .Date property on DateTime object will return only Date part.
If you are using Entity Framework 6 then.
date = date.Date;
int count = dbcontext.CampaignEmails.Count(x => DbFunctions.TruncateTime(x.DateSigned) == date.Date && x.CampaignID == campaignID);
Else
date = date.Date;
int count = dbcontext.CampaignEmails.Count(x => EntityFunctions.TruncateTime(x.DateSigned) == date.Date && x.CampaignID == campaignID);
Related
I have the following SQL query to be translated to LINQ
string qWhere;
DateTime startDate = DateTime.Parse("2018-02-01");
DateTime endDate = DateTime.Parse("2018-02-03");
if(manual == true)
{
qWhere = " deliveryDate>=" + startDate + " and deliveryDate<=" + endDate;
}
else
{
qWhere = "deliveryDate>=" + DateTime.Now;
}
string sqlQuery = "select * from LoadingOrder where " + qWhere;
can anyone help me to translate this query to LINQ, table LoadingOrder have million rows.
Many thanks
If it was just the one condition then you could have two separate queries instead of one query. I think that's a lot easier to read and follow then placing the conditional inside the query itself.
var now = DateTime.Now;
if(manual)
result = LoadingOrders.Where(s=> s.deliveryDate >= startDate && s.deliveryDate <= endDate);
else
result = LoadingOrders.Where(s=> s.deliveryDate >= now);
Suppose the query has lots of conditions and the "delivery date" condition is the only one that changes. In that case you probably wouldn't want to have two entire versions of the query with just one difference. In that case, you can create that one condition separately.
To do that you would create a Func<LoadingOrder, bool> - a function that takes a LoadingOrder and returns true or false. And then you would assign whichever condition you want to check for to that function.
Func<LoadingOrder, bool> deliveryDateCondition;
if(manual)
deliveryDateCondition = loadingOrder =>
loadingOrder.deliveryDate >= startDate && loadingOrder.deliveryDate <= endDate;
else
{
var now = DateTime.Now;
deliveryDateCondition = loadingOrder => loadingOrder.deliveryDate >= now;
}
Now deliveryDateCondition is function that takes a LoadingOrder and returns true or false. You can add that function into your LINQ query, and it works regardless of which function was selected.
var result = LoadingOrders.Where(loadingOrder => deliveryDateCondition(loadingOrder)
&& ...some other condition...
&& ...some other condition...);
Something like this:
DateTime startDate = DateTime.Parse("2018-02-01");
DateTime endDate = DateTime.Parse("2018-02-03");
bool manual = ...;
loadingOrders.Where(
o => o.DeliveryDate >= startDate &&
o.DeliveryDate <= endDate &&
manual ||
o.DeliveryDate >= DateTime.Now &&
!manual);
var now = DateTime.Now;
var query = from e in db.LoadingOrder
where (e.deliveryDate >= startDate && e.deliveryDate <= endDate && manual)
|| (e.deliveryDate >= now)
select e;
OR
var query = db.LoadingOrder.Where(x => (x.deliveryDate >= startDate && x.deliveryDate <= endDate && manual) || (x.deliveryDate >= now));
I want to filter some documents between a different date. First I tried comparing the dates directly, but the time (hour, minutes, second) doesn't have to be considered. Therefore only the date part is needed, but the following approach is wrong:
DateTime? fromDate = documentFilter.fromDate;
if (fromDate.HasValue) {
filterResults = filterResults.Where (d => d.LastModifiedAt.Value.Year >= fromDate.Value.Year
&& d.LastModifiedAt.Value.Month >= fromDate.Value.Month
&& d.LastModifiedAt.Value.Day >= fromDate.Value.Day);
}
DateTime? toDate = documentFilter.toDate;
if (toDate.HasValue) {
filterResults = filterResults.Where (d => d.LastModifiedAt.Value.Year <= toDate.Value.Year
&& d.LastModifiedAt.Value.Month <= toDate.Value.Month
&& d.LastModifiedAt.Value.Day <= toDate.Value.Day);
}
Consider the from date 8/15/2014 12:00:00 AM and the to date 9/15/2014 12:00:00 AM. If the document has the date 8/16/2014 10:06:25 AM it won't be in the results. The reason is that I directly compare each component (year, month, day). Because the day is 16 and 16 > 15 the last condition is not met.
How can I solve this? Should I set the time to one minute before midnight? Or should I calculate the difference?
Just use the DateTime.Date property:
if (fromDate.HasValue) {
filterResults = filterResults
.Where(d => d.LastModifiedAt.Date >= fromDate.Value.Date);
}
if (toDate.HasValue) {
filterResults = filterResults
.Where(d => d.LastModifiedAt.Date <= toDate.Value.Date);
}
DateTime has a Date property which returns a DateTime for the same day at midnight:
DateTime? fromDate = documentFilter.fromDate;
if (fromDate.HasValue)
filterResults = filterResults.Where(d => d.LastModifiedAt.Value.Date >= fromDate.Value.Date);
DateTime? toDate = documentFilter.toDate;
if (toDate.HasValue)
filterResults = filterResults.Where(d => d.LastModifiedAt.Value.Date <= toDate.Value.Date);
How to loop every month's first date.
public struct stat{
public DateTime date;
}
I have a List<stat> that have a date property. I want to get the lowest and newest one by sorting. the first element is older and last is newer one.
I can easily got the first and second by order by.
What I want is get 1st date of every month in the between of both first (oldest ) and newest.
string ret = "";
List<DateTime> dates = new List<DateTime>();
int breaker = DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month);
stats = stats.OrderBy(x => x.Date).ToList();
DateTime old = stats.First().Date;
DateTime #new = stats.Last().Date;
int diffdays = #new.Subtract(old).Days;
DateTime loopd = DateTime.Now;
for (int i = 0; i < diffdays; i = i + breaker)
{
loopd = loopd.AddDays(-breaker);
dates.Add(loopd);
if (loopd < old)
Console.WriteLine("date" + old);
}
for (int j = 0; j < dates.Count; j++)
{
if (j == 0)
{
DateTime ld= dates[0];
stats.SelectMany(x => x.Date < #new && x.Date > dates[j]);
}
}
I want to get the lowest and newest one by sorting
I assume lowest means oldest.
stat oldest = stats.OrderBy(s => s.date).FirstOrDefault();
stat newest = stats.OrderByDescending(s => s.date).FirstOrDefault();
you could also use
stats.OrderBy(s => s.date).LastOrDefault();
to get the newest.
you could use something like this:
List<stat> statList = new List<stat>();
...
var selectedItem = statList
.OrderBy(item => item.date)
.Select(l => l.last());
or you could use OrderByDecending() instead
var _My_ResetSet_Array = _DB
.tbl_MyTable
.Where(x => x.Active == true
&& x.DateTimeValueColumn <= DateTime.Now)
.Select(x => x);
Upper query is working correct.
But I want to check only date value only.
But upper query check date + time value.
In traditional mssql, I could write query like below.
SELECT * FROM dbo.tbl_MyTable
WHERE
CAST(CONVERT(CHAR(10), DateTimeValueColumn, 102) AS DATE) <=
CAST(CONVERT(CHAR(10),GETDATE(),102) AS DATE)
AND
Active = 1
So could anyone give me suggestion how could I check only date value in Linq.
There is also EntityFunctions.TruncateTime or DbFunctions.TruncateTime in EF 6.0 or later
Simple workaround to this problem to compare date part only
var _My_ResetSet_Array = _DB
.tbl_MyTable
.Where(x => x.Active == true &&
x.DateTimeValueColumn.Year == DateTime.Now.Year
&& x.DateTimeValueColumn.Month == DateTime.Now.Month
&& x.DateTimeValueColumn.Day == DateTime.Now.Day);
Because 'Date' datatype is not supported by linq to entity , where as Year, Month and Day are 'int' datatypes and are supported.
EDIT
To avoid this error : The specified type member 'Date' is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported.
var _My_ResetSet_Array = _DB
.tbl_MyTable
.Where(x => x.Active == true)
.Select(x => x).ToList();
var filterdata = _My_ResetSet_Array
.Where(x=>DateTime.Compare(x.DateTimeValueColumn.Date, DateTime.Now.Date) <= 0 );
The second line is required because LINQ to Entity is not able to convert date property to sql query. So its better to first fetch the data and then apply the date filter.
EDIT
If you just want to compare the date value of the date time than make use of
DateTime.Date Property - Gets the date component of this instance.
Code for you
var _My_ResetSet_Array = _DB
.tbl_MyTable
.Where(x => x.Active == true
&& DateTime.Compare(x.DateTimeValueColumn.Date, DateTime.Now.Date) <= 0 )
.Select(x => x);
If its like that then use
DateTime.Compare Method - Compares two instances of DateTime and returns an integer that indicates whether the first instance is earlier than, the same as, or later than the second instance.
Code for you
var _My_ResetSet_Array = _DB
.tbl_MyTable
.Where(x => x.Active == true
&& DateTime.Compare(x.DateTimeValueColumn, DateTime.Now) <= 0 )
.Select(x => x);
Example
DateTime date1 = new DateTime(2009, 8, 1, 0, 0, 0);
DateTime date2 = new DateTime(2009, 8, 1, 12, 0, 0);
int result = DateTime.Compare(date1, date2);
string relationship;
if (result < 0)
relationship = "is earlier than";
else if (result == 0)
relationship = "is the same time as";
else
relationship = "is later than";
result = from r in result where (r.Reserchflag == true &&
(r.ResearchDate.Value.Date >= FromDate.Date &&
r.ResearchDate.Value.Date <= ToDate.Date)) select r;
&& x.DateTimeValueColumn <= DateTime.Now
This is supported so long as your schema is correct
&& x.DateTimeValueColumn.Value.Date <=DateTime.Now
In similar case I used the following code:
DateTime upperBound = DateTime.Today.AddDays(1); // If today is October 9, then upperBound is set to 2012-10-10 00:00:00
return var _My_ResetSet_Array = _DB
.tbl_MyTable
.Where(x => x.Active == true
&& x.DateTimeValueColumn < upperBound) // Accepts all dates earlier than October 10, time of day doesn't matter here
.Select(x => x);
Working code :
{
DataBaseEntity db = new DataBaseEntity (); //This is EF entity
string dateCheck="5/21/2018";
var list= db.tbl
.where(x=>(x.DOE.Value.Month
+"/"+x.DOE.Value.Day
+"/"+x.DOE.Value.Year)
.ToString()
.Contains(dateCheck))
}
Try this,
var _My_ResetSet_Array = _DB
.tbl_MyTable
.Where(x => x.Active == true
&& x.DateTimeValueColumn <= DateTime.Now)
.Select(x => x.DateTimeValueColumn)
.AsEnumerable()
.select(p=>p.DateTimeValueColumn.value.toString("YYYY-MMM-dd");
Do not simplify the code to avoid "linq translation error":
The test consist between a date with time at 0:0:0 and the same date with time at 23:59:59
iFilter.MyDate1 = DateTime.Today; // or DateTime.MinValue
// GET
var tempQuery = ctx.MyTable.AsQueryable();
if (iFilter.MyDate1 != DateTime.MinValue)
{
TimeSpan temp24h = new TimeSpan(23,59,59);
DateTime tempEndMyDate1 = iFilter.MyDate1.Add(temp24h);
// DO not change the code below, you need 2 date variables...
tempQuery = tempQuery.Where(w => w.MyDate2 >= iFilter.MyDate1
&& w.MyDate2 <= tempEndMyDate1);
}
List<MyTable> returnObject = tempQuery.ToList();
Use mydate.Date to work with the date part of the DateTime class only.
I'm trying to get my linq statement to get me all records between two dates, and I'm not quite sure what I need to change to get it to work: (a.Start >= startDate && endDate)
var appointmentNoShow =
from a in appointments
from p in properties
from c in clients
where a.Id == p.OID && (a.Start.Date >= startDate.Date && endDate)
Just change it to
var appointmentNoShow = from a in appointments
from p in properties
from c in clients
where a.Id == p.OID &&
(a.Start.Date >= startDate.Date && a.Start.Date <= endDate)
var appointmentNoShow = from a in appointments
from p in properties
from c in clients
where a.Id == p.OID
where a.Start.Date >= startDate.Date
where a.Start.Date <= endDate.Date
var QueryNew = _context.Appointments.Include(x => x.Employee).Include(x => x.city).Where(x => x.CreatedOn >= FromDate).Where(x => x.CreatedOn <= ToDate).Where(x => x.IsActive == true).ToList();
So you are scrolling down because the Answers do not work:
This works like magic (but they say it has efficiency issues for big data, And you do not care just like me)
1- Data Type in Database is "datetime" and "nullable" in my case.
Example data format in DB is like:
2018-11-06 15:33:43.640
An in C# when converted to string is like:
2019-01-03 4:45:16 PM
So the format is :
yyyy/MM/dd hh:mm:ss tt
2- So you need to prepare your datetime variables in the proper format first:
Example 1
yourDate.ToString("yyyy/MM/dd hh:mm:ss tt")
Example 2 - Datetime range for the last 30 days
DateTime dateStart = DateTime.Now.AddDays(-30);
DateTime dateEnd = DateTime.Now.AddDays(1).AddTicks(-1);
3- Finally the linq query you lost your day trying to find (Requires EF 6)
using System.Data.Entity;
_dbContext.Shipments.Where(s => (DbFunctions.TruncateTime(s.Created_at.Value) >= dateStart && DbFunctions.TruncateTime(s.Created_at.Value) <= dateEnd)).Count();
To take time comparison into account as well :
(DbFunctions.CreateDateTime(s.Created_at.Value.Year, s.Created_at.Value.Month, s.Created_at.Value.Day, s.Created_at.Value.Hour, s.Created_at.Value.Minute, s.Created_at.Value.Second) >= dateStart && DbFunctions.CreateDateTime(s.Created_at.Value.Year, s.Created_at.Value.Month, s.Created_at.Value.Day, s.Created_at.Value.Hour, s.Created_at.Value.Minute, s.Created_at.Value.Second) <= dateEnd)
Note the following method mentioned on other stackoverflow questions and answers will not work correctly:
....
&&
(
s.Created_at.Value.Day >= dateStart.Day && s.Created_at.Value.Day <= dateEnd.Day &&
s.Created_at.Value.Month >= dateStart.Month && s.Created_at.Value.Month <= dateEnd.Month &&
s.Created_at.Value.Year >= dateStart.Year && s.Created_at.Value.Year <= dateEnd.Year
)).count();
if the start day was in this month for example and the end day is on the next month, the query will return false and no results, for example:
DatabaseCreatedAtItemThatWeWant = 2018/12/05
startDate = 2018/12/01
EndDate = 2019/01/04
the query will always search for days between 01 and 04 without taking the "month" into account, so "s.Created_at.Value.Day <= dateEnd.Day" will fail
And in case you have really big data you would execute Native SQL Query rather than linq
...
... where Shipments.Created_at BETWEEN CAST(#Created_at_from as datetime) AND CAST(#Created_at_to as datetime))
....
Thanks
If someone interested to know how to work with 2 list and between dates
var newList = firstList.Where(s => secondList.Any(secL => s.Start > secL.RangeFrom && s.End < secL.RangeTo))
public List<tbltask> gettaskssdata(int? c, int? userid, string a, string StartDate, string EndDate, int? ProjectID, int? statusid)
{
List<tbltask> tbtask = new List<tbltask>();
DateTime sdate = (StartDate != "") ? Convert.ToDateTime(StartDate).Date : new DateTime();
DateTime edate = (EndDate != "") ? Convert.ToDateTime(EndDate).Date : new DateTime();
tbtask = entity.tbltasks.Include(x => x.tblproject).Include(x => x.tbUser).
Where(x => x.tblproject.company_id == c
&& (ProjectID == 0 || ProjectID == x.tblproject.ProjectId)
&& (statusid == 0 || statusid == x.tblstatu.StatusId)
&& (a == "" || (x.TaskName.Contains(a) || x.tbUser.User_name.Contains(a)))
&& ((StartDate == "" && EndDate == "") || ((x.StartDate >= sdate && x.EndDate <= edate)))).ToList();
return tbtask;
}
this my query for search records based on searchdata and between start to end date
If you have date interval filter condition and you need to select all records which falls partly into this filter range. Assumption: records has ValidFrom and ValidTo property.
DateTime intervalDateFrom = new DateTime(1990, 01, 01);
DateTime intervalDateTo = new DateTime(2000, 01, 01);
var itemsFiltered = allItems.Where(x=>
(x.ValidFrom >= intervalDateFrom && x.ValidFrom <= intervalDateTo) ||
(x.ValidTo >= intervalDateFrom && x.ValidTo <= intervalDateTo) ||
(intervalDateFrom >= x.ValidFrom && intervalDateFrom <= x.ValidTo) ||
(intervalDateTo >= x.ValidFrom && intervalDateTo <= x.ValidTo)
);
I had a problem getting this to work.
I had two dates in a db line and I need to add them to a list for yesterday, today and tomorrow.
this is my solution:
var yesterday = DateTime.Today.AddDays(-1);
var today = DateTime.Today;
var tomorrow = DateTime.Today.AddDays(1);
var vm = new Model()
{
Yesterday = _context.Table.Where(x => x.From <= yesterday && x.To >= yesterday).ToList(),
Today = _context.Table.Where(x => x.From <= today & x.To >= today).ToList(),
Tomorrow = _context.Table.Where(x => x.From <= tomorrow & x.To >= tomorrow).ToList()
};
You can use DbFunctions.TruncateTime(StartDateTime) To remove the time from datetime
var appointmentNoShow =
from a in appointments
from p in properties
from c in clients
where a.Id == p.OID && (DbFunctions.TruncateTime(a.Start) >= DbFunctions.TruncateTime(startDate) && endDate)