Develop Reference

How to convert this SQL query into LINQ in c#

UPDATE m
SET m.Score = s.AScore + '-' + s.BScore
FROM #Matches m
INNER JOIN Scores s ON m.MatchId = s.MatchId
AND s.InfoTypeId = (
CASE
WHEN m.SportId = 1 AND (m.StatusId >= 13 AND m.StatusId <= 17) THEN 10
WHEN m.SportId = 1 AND m.StatusId = 20 THEN 24
WHEN m.SportId = 1 AND m.StatusId = 21 THEN 23
WHEN m.SportId = 1 AND m.StatusId = 18 THEN 8
ELSE 5
END
)
I'm having two lists in C# one is Matches and 2nd is Scores, and I want to get the result from those list like the result this query will return. Means I want to update "Score" property of "Matches" list like it is being updated in SQL query.
Any Help Please.
Matches.ForEach(m => m.Score = (Scores.Where(ms => ms.MatchId == m.MatchId
&& ms.ScoreInfoTypeId == ((m.SportId == 1 && m.StatusId >= 13 && m.StatusId <= 17) ? 10
: (m.SportId == 1 && m.StatusId == 20) ? 24
: (m.SportId == 1 && m.StatusId == 21) ? 23
: (m.SportId == 1 && m.StatusId == 18) ? 8
: 5)).Select(ms => ms.AScore + "-" + ms.BScore).FirstOrDefault()));
I have tried, but I think its too expensive. It is taking too much time. Is there any optimized way please.

Try this example in LinqPad. You can use query syntax to join the 2 lists and iterate over the result to set match scores. I used a dictionary to simplify that switch case.
void Main()
{
var matches = new[]{
new Match{MatchId=1,SportId=1,StatusId=13,Score=""},
new Match{MatchId=2,SportId=1,StatusId=18,Score=""},
new Match{MatchId=3,SportId=2,StatusId=24,Score=""},
};
var scores = new[]{
new{MatchId=1,AScore="10",BScore="0",InfoTypeId=10},
new{MatchId=2,AScore="20",BScore="0",InfoTypeId=8},
new{MatchId=3,AScore="30",BScore="0",InfoTypeId=5},
};
var dict = new Dictionary<int,int>{[13]=10,[14]=10,[15]=10,[16]=10,[17]=10,[20]=24,[21]=23,[18]=8};
var data = (from m in matches
join s in scores on m.MatchId equals s.MatchId
where s.InfoTypeId == ((m.SportId == 1 && dict.ContainsKey(m.StatusId))? dict[m.StatusId] : 5)
select new {m,s}
).ToList();
data.ForEach(o =>
{
o.m.Score = o.s.AScore + "-" + o.s.BScore;
});
matches.Dump();
}
class Match{public int MatchId; public int SportId; public int StatusId; public string Score;}

LINQ Query to Filter then to a Model

How can I do this correctly?
This is failing because schedule-on does not exist within m from RR2.
var RR = (from m in DataContext.csrcallds
where m.scheduledon >= earliestDate
&& m.scheduledon <= objdate1.DateStart
&& m.assignto == 113
&& (SqlMethods.DateDiffDay(m.scheduledon, m.completedon) > 5)
select m
);
var RR2 = RR.Select(x => (GetBusinessDays((DateTime)x.scheduledon, (DateTime)x.completedon)) > 5).ToList());
var RnR = (from m in RR2
group m by new { m.scheduledon.Value.Year, m.scheduledon.Value.Month } into p
orderby p.Key.Year ascending, p.Key.Month ascending
select new Date1()
{
theDate = DateTime.Parse($"{p.Key.Month} - {p.Key.Year}"),
theCount = p.Count(),
theString = $"{p.Key.Month} - {p.Key.Year}"
});
I am trying to query all the results.
Then use my GetBusinessDay function to filter out the ones I don't need, gathering only the records within 5 business days.
Then put the results into my Model named Date1.
I'm trying to do it like this because I cannot use GetBusinessDays within an LINQ query.
So I'm trying to filter it outside of SQL, then group the records again.
How do I go about accomplishing this task?

You could add this to your SQL Query to filter out the weekend days.
SELECT *
FROM your_table
WHERE ((DATEPART(dw, date_created) + ##DATEFIRST) % 7) NOT IN (0, 1)
Or This
select [date_created]
from table
where DATENAME(WEEKDAY, [date_created]) <> 'Saturday'
and DATENAME(WEEKDAY, [date_created]) <> 'Sunday'
Or if you have to stick to LINQ try the ideas outlined here:
Linq query DateTime.Date.DayOfWeek
DateTime firstSunday = new DateTime(1753, 1, 7);
var bookings = from b in this.db.Bookings
where EntityFunctions.DiffDays(firstSunday, b.StartDateTime) % 7 == 1
select b;

Solved by using function workdays server side:
https://stackoverflow.com/a/252532/6157660
Allows me to make a simple LINQ query, and gives me what I need.
I did edit the function to remove the +1 from DateDiff. as same days should be 0 not 1.
Thank you guys for your help!
var RnR = (from m in DataContext.csrcallds
where m.scheduledon >= earliestDate
&& m.scheduledon <= objdate1.DateStart
&& m.assignto == 113
&& (DataContext.fn_WorkDays((DateTime)m.scheduledon, (DateTime)m.completedon)) > 5
group m by new { m.scheduledon.Value.Year, m.scheduledon.Value.Month } into p
orderby p.Key.Year ascending, p.Key.Month ascending
select new Date1()
{
theDate = DateTime.Parse($"{p.Key.Month} - {p.Key.Year}"),
theCount = p.Count(),
theString = $"{p.Key.Month} - {p.Key.Year}"
});

Transforming T-SQL Query into C# LINQ with joins on multiple conditions and also grouping on multiple conditions

First I want to say hello, I'm new to this site ;-)
My problem is to transform the following sql-query into a c# linq-query.
( I HAVE searched hard for an existing answer but I'm not able to combine the solution for
the joins on multiple conditions and the grouping / counting ! )
The sql-query :
DECLARE #datestart AS DATETIME
DECLARE #dateend AS DATETIME
SET #datestart = '01.04.2014'
SET #dateend = '30.04.2014'
SELECT md1.value AS [controller],md2.value AS [action], COUNT(md2.value) AS [accesscount], MAX(re.TIMESTAMP) AS [lastaccess] FROM recorderentries AS re
INNER JOIN messagedataentries AS md1 ON re.ID = md1.recorderentry_id AND md1.position = 0
INNER JOIN messagedataentries AS md2 ON re.ID = md2.recorderentry_id AND md2.position = 1
WHERE re.TIMESTAMP >= #datestart AND re.TIMESTAMP <= #dateend
AND re.messageid IN ('ID-01','ID-02' )
GROUP BY md1.value,md2.value
ORDER BY [accesscount] DESC
Any suggestions are welcome ...
What i have so far is this :
var _RecorderActionCalls = (from r in _DBContext.RecorderEntries
join m1 in _DBContext.MessageDataEntries on
new {
a = r.ID,
b = 0
} equals new {
a = m1.ID,
b = m1.Position
}
join m2 in _DBContext.MessageDataEntries on
new {
a = r.ID,
b = 0
} equals new {
a = m2.ID,
b = m2.Position
}
where r.TimeStamp >= StartDate & r.TimeStamp <= EndDate & (r.MessageID == "VAREC_100_01" | r.MessageID == "VAAUTH-100.01")
group r by new { md1 = m1.Value, md2 = m2.Value } into r1
select new { controller = r1.Key.md1, action = r1.Key.md2, count = r1.Key.md2.Count() }).ToList();
But this throws an exception ( translated from german ) :
DbExpressionBinding requires an input expression with a Listing Result Type ...
UPDATE : Back with headache ... ;-)
I found a solution to my problem :
var _RecorderActionCalls = _DBContext.RecorderEntries
.Where(r => r.TimeStamp >= StartDate & r.TimeStamp <= EndDate & (r.MessageID == "VAREC_100_01" | r.MessageID == "VAAUTH-100.01"))
.GroupBy(g => new { key1 = g.MessageData.FirstOrDefault(md1 => md1.Position == 0).Value, key2 = g.MessageData.FirstOrDefault(md2 => md2.Position == 1).Value })
.Select(s => new {
ControllerAction = s.Key.key1 + " - " + s.Key.key2,
Value = s.Count(),
Last = s.Max(d => d.TimeStamp)
}).ToList();
With this syntax it works for me. Thank you for thinking for me :-)

Something like that:
List<string> messageIdList = new List<string> { "ID-01", "ID-02" };
from re in RecorderEntries
from md1 in MessageDataEntries
from md2 in MessageDataEntries
where re.ID = md1.recorderEntry_id && md1.position == 0
where re.ID = md2.recorderEntry_id && md2.position == 1
where idList.Contains(re.messageid)
let joined = new { re, md1, md2 }
group joined by new { controller = joined.md1.value, action = joined.md2.value } into grouped
select new {
controller = grouped.Key.controller,
action = grouped.Key.action,
accesscount = grouped.Where(x => x.md2.value != null).Count(),
lastaccess = grouped.Max(x => x.re.TimeStamp) }

Linq average in Dictionary

I have a Dictionary and want to get the average of attendances from a specific timeframe.
So far I have this working which gives me the numbers of attendances:
var vCounts = (from pil in planInfoList
from s in pil.Value
where (s.CheckInActualUtc.TimeOfDay >= TStart
&& s.CheckInActualUtc.TimeOfDay <= TEnd)
select s).Count();
The s.CheckInActualUtc is multiple dates.
How to get the avarage of attendances?
I have tried this, but this is a no go:
var vAverage = from pil in planInfoList
from s in pil.Value
where (s.CheckInActualUtc.TimeOfDay >= TStart
&& s.CheckInActualUtc.TimeOfDay <= TEnd)
group s by s.CheckInActualUtc.DayOfYear into g
select new { av = g.Average() };

If you mean, you want the average of the number of attendees per day:
var vAverage = (from pil in planInfoList
from s in pil.Value
where (s.CheckInActualUtc.TimeOfDay >= TStart
&& s.CheckInActualUtc.TimeOfDay <= TEnd)
group s by s.CheckInActualUtc.DayOfYear into g
select g.Count()).Average();

Group and Aggregate with LINQ

I have a timesheet entries as below
ActivityCode : Duration
Project A: 12h:31mins
Project B: 00h:10mins
Project A: 01h:10mins
Project A: 12h:31mins
Project C: 12h:31mins
Project B: 00h:10mins
Project B: 01h:10mins
Project A: 12h:31mins
What is the correct way to group the projects and aggregate their total time spent? i'm trying the below
var summary = from entry in DbSet
where entry.Timesheet.UserID == userid &&
entry.Timesheet.DateSubmitted >= startdate &&
entry.Timesheet.DateSubmitted <= enddate
group entry by entry.ActivityCode.ActivityCode1
into groupEntry
select new TimeSheetSummary()
{
ActivityCode = groupEntry.Key,
HourSpent = Convert.ToInt32(groupEntry.Sum(x => x.Duration)),
Percentage = (Convert.ToInt32(groupEntry.Sum(x => x.Duration)) / 8) * 100,
MinuteSpent = Convert.ToInt32(groupEntry.Sum(x => x.Duration)) * 60,
};

If you want to get a percentage, get a count of the number of activites and use that to divide by.
Not sure if you will need a divide by 0 check here. I'm not sure what the second LINQ will do if there's no data to begin with. Not sure if that would raise an error or not.
Int32 numberOfProjects = (from entry in DbSet
where entry.Timesheet.UserID == userid &&
entry.Timesheet.DateSubmitted >= startdate &&
entry.Timesheet.DateSubmitted <= enddate
select entry.ActivityCode.ActivityCode1).Distinct().Count();
var summary = from entry in DbSet
where entry.Timesheet.UserID == userid &&
entry.Timesheet.DateSubmitted >= startdate &&
entry.Timesheet.DateSubmitted <= enddate
group entry by entry.ActivityCode.ActivityCode1
into groupEntry
select new TimeSheetSummary()
{
ActivityCode = groupEntry.Key,
HourSpent = Convert.ToInt32(groupEntry.Sum(x => x.Duration)),
Percentage = (Convert.ToInt32(groupEntry.Sum(x => x.Duration)) / numberOfProjects) * 100,
MinuteSpent = Convert.ToInt32(groupEntry.Sum(x => x.Duration)) * 60,
};

Here's what i found as answer based on the inputs by others in the thread. thanks!
var groupEntries = from entry in DbSet
where entry.Timesheet.UserID == userId &&
entry.Timesheet.TimeSheetDate <= endDate.Date &&
entry.Timesheet.TimeSheetDate >= startDate.Date
group entry by entry.ActivityCode
into groupEntry
select new
{
ActivityCode = groupEntry.Key,
Duration = Convert.ToInt16(groupEntry.Sum(r => r.Duration))
};
var totalDuration = groupEntries.Sum(r => r.Duration);
var result = from groupEntry in groupEntries
select new TimeSheetSummary()
{
ActivityCode = groupEntry.ActivityCode,
HourSpent = groupEntry.Duration / 60,
MinuteSpent = groupEntry.Duration % 60,
Percentage = groupEntry.Duration / totalDuration * 100
};