I have this query:
var months = dates.GroupBy(
x => x.Value.Month).Select(g => new { Month = g.Key, Count = g.Count()});
lbl1.Text = string.Join(",", months);
How do I assign key and count to two different labels?
Try this
lblMonth.Text=months.Month;
lblCount.Text=months.Count;
Also you have to call FirstOrDefault() or ToList() in order to select data. Currently you code will not select data.
var months = dates.GroupBy(x => x.Value.Month).Select(g => new { Month = g.Key, Count = g.Count() }).FirstOrDefault();
OR
var months = dates.GroupBy(x => x.Value.Month).Select(g => new { Month = g.Key, Count = g.Count() }).ToList();
if you use ToList() than you will have to get values by index like
lblMonth.Text=months[0].Month;
lblCount.Text=months[0].Count;
Related
How can i convert the following query to entity framework in query syntax..
SELECT MIN(Date) StartDate, MAX(Date) EndDate, Title, Flag FROM
Holiday GROUP BY Title, Flag
Any help?
After a hard time i get the solution
(from e in db.Holidays
group e by new {e.Title, e.Flag}
into g
select new AllEventViewModel
{
start = g.Max(e=>e.Date),
end = g.Min(e => e.Date),
title = g.Key.Title,
Flag = g.Key.Flag
}).AsEnumerable();
var results = db.holidays.GroupBy(g => new { g.Title, g.Flag }).Select(k => new
{
MinDate = k.Min(a => a.Date),
StartDate = k.FirstOrDefault().StartDate,
MaxDate = k.Max(b => b.Date),
EndDate = k.FirstOrDefault().EndDate,
Title = k.Key.Title,
Flag = k.Key.Flag
}).ToList();
Hi Need some help with LINQ query.
I have entity called Shift. This entity has several value field but the ones I am intressted in are ShiftID (int), ShiftDate (DateTime) and GrossMount (decimal(10,2). And this needs to be grouped by month (binding this to a graph in ASP.NET).
I need data for the last 12 months grouped by month.
I have come a bit on the way with this post: Linq to Entity, selecting group without value but not quite all the way.
This is my code for now:
public IQueryable<Shift> GetPastMonths(int months, string accountNumber)
{
_context = new EtaxiEnteties();
var _date = DateTime.Today;
var _firstOfMonth = new DateTime(_date.Year, _date.Month, 31);
var _twelveMonthAgoFirstOfMonth = _firstOfMonth.AddMonths(-12);
// Generate a collection of the months and years for the last 12 months
var _monthYears = Enumerable.Range(-12, 12).Select(monthOffset => { var monthDate = _firstOfMonth.AddMonths(monthOffset); return new { y = monthDate.Year, m = monthDate.Month }; });
var _data = (from _monthYear in _monthYears
join _i in
(from _i in _context.Shifts.Where(acc => acc.Account.AccountNumber == accountNumber)
where _i.ShiftDate >= _twelveMonthAgoFirstOfMonth && _i.ShiftDate < _firstOfMonth
group _i by new { y = _i.ShiftDate.Year, m = _i.ShiftDate.Month } into g
select new { ShiftID = g.Key, GrossAmount = g.Count() }) on _monthYear equals _i.ShiftID into j
from _k in j.DefaultIfEmpty()
select new Shift() { ShiftDate = new DateTime(_monthYear.y, _monthYear.m, 1), GrossAmount = _k != null ? _k.GrossAmount : 0 });
return _data as IQueryable<Shift>;
}
Now I have in return a collection of Shift objects, grouped by month but still missing the GrossAmount. Althoug i would need this from today date (only getting from 1 of current month).
Believe this is my main problem: GrossAmount = g.Count(), but I am not sure
Any LINQ specialist out there that could give me a push?
Use GrossAmount = g.Sum(x => x.GrossAmount) to calculate total GrossAmount value of grouped Shift entities. I believe you have typo in GrossAmount (GrossMount) property name.
Afternoon,
I am trying to return a list of products from my SQL Server 2008 R2 database but I only want to return the results with the latest date.
However the code below seems to return all items, even the ones with an older date. How do I go about getting my results with just the latest date.
var query = (from a in dc.aboProducts
join t in dc.twProducts on a.sku equals t.sku
join lp in dc.LowestPrices on a.asin equals lp.productAsin
select new GetLowestPrices
{
productAsin = lp.productAsin,
sku = t.sku,
title = t.title,
twprice = Convert.ToString(t.twPrice),
lowprice = Convert.ToString(lp.price),
amzprice = Convert.ToString(lp.tweAmzPrice),
lastupdated = Convert.ToDateTime(lp.priceDate)
}).Distinct().OrderBy(ti => ti.title);
return query.ToList();
Try something like this:
var query =
from a in dc.aboProducts
join t in dc.twProducts on a.sku equals t.sku
join lp in dc.LowestPrices on a.asin equals lp.productAsin
select new GetLowestPrices
{
productAsin = lp.productAsin,
sku = t.sku,
title = t.title,
twprice = Convert.ToString(t.twPrice),
lowprice = Convert.ToString(lp.price),
amzprice = Convert.ToString(lp.tweAmzPrice),
lastupdated = Convert.ToDateTime(lp.priceDate)
};
var lookup =
query
.ToLookup(x => x.sku)
.Select(x => x.OrderByDescending(y => y.lastupdated).First())
.OrderBy(x => x.title);
return lookup.ToList();
Because the Distinct is not applied on the existing list, but create a new one, and you need to get it on a new list as:
val DistinctList = ExistingList.Distinct().ToList();
I'm new to linq.
In c# I'm doing as follows to get the count of one column.
SELECT DispatcherName,
ActivityType,
CONVERT(BIGINT,COUNT(ActivityType)) AS Total
FROM ACTIVITYLOG
GROUP BY DispatcherName,
ActivityType
ORDER BY Total DESC
Can any one tell m,how I can achieve the same thing using LINQ.
Update:
HI I did as follows and got the reslut.
But I'm not able to convert result to datatable.
this is how I did.
here dt is datatabe with two columns Dispatchername and ActivityType.
var query1 = from p in dt.AsEnumerable()
group p by new
{
DispatcherName = p.Field<string>("Dispatchername"),
Activity = p.Field<string>("ActivityType"),
}
into pgroup
let count = pgroup.Count()
orderby count
select new
{
Count = count,
DispatcherName = pgroup.Key.DispatcherName,
Activity = pgroup.Key.Activity
};
pls help me out asap.
from c in ACTIVITYLOG
group c by new {c.DispatcherName, c.ActivityType} into g
orderby g.Count() descending
select new { g.Key.DispatcherName, g.Key.ActivityType, Total = g.Count() }
If you want your results returned back to a DataTable, one option is to use the CopyToDataTable method.
Here's a live example: http://rextester.com/XHX48973
This method basically requires you to create a dummy table in order to use its NewRow method - the only way to create a DataRow, which is required by CopyToDataTable.
var result = dt.AsEnumerable()
.GroupBy(p => new {
DispatcherName = p.Field<string>("DispatcherName"),
Activity = p.Field<string>("ActivityType")})
.Select(p => {
var row = dummy.NewRow();
row["Activity"] = p.Key.Activity;
row["DispatcherName"] = p.Key.DispatcherName;
row["Count"] = p.Count();
return row;
})
.CopyToDataTable();
Perhaps a better way might be just fill in the rows directly, by converting to a List<T> and then using ForEach.
DataTable dummy = new DataTable();
dummy.Columns.Add("DispatcherName",typeof(string));
dummy.Columns.Add("Activity",typeof(string));
dummy.Columns.Add("Count",typeof(int));
dt.AsEnumerable()
.GroupBy(p => new { DispatcherName = p.Field<string>("DispatcherName"),
Activity = p.Field<string>("ActivityType")})
.ToList()
.ForEach(p => {
var row = dummy.NewRow();
row["Activity"] = p.Key.Activity;
row["DispatcherName"] = p.Key.DispatcherName;
row["Count"] = p.Count();
dummy.Rows.Add(row);
});
Live example: http://rextester.com/TFZNEO48009
This should do the trick:
IList<ACTIVITYLOG> allActivityLogs;
var result = (from c in allActivityLogs
select new
{
DispatcherName = c.DispatcherName,
ActivityType = c.ActivityType,
Total = c.ActivityType.Count
}).OrderByDescending(x => x.Total)
.GroupBy(x => new { x.DispatcherName, x.ActivityType });
You only need to substitute the allActivityLogs collection with the actual collection of your entities.
I having a trouble with a query
I need to take out the SHIPMENT from GetAllOrderData - the same place where you can find POD_DATE and RECEIVE_NAME...but I get an error
Error 1 The name 'x' does not exist in the current context
My code is:
public IEnumerable<ReportItemDTO> GetTaskProgress(DateTime targetDate)
{
try
{
var startDate = targetDate.Date;
var endDate = startDate.AddDays(1);
OrderDataRepository rep = new OrderDataRepository();
var query = rep.GetAllOrderData()
.Where(x => x.POD_DATE >= startDate && x.POD_DATE <= endDate)
.GroupBy(o => o.User)
.Select(g => new ReportItemDTO
{
DriverId = g.Key.Id,
PdriverName = g.Key.Name,
OrderCount = g.Count(),
ReportedOrdersCount = g.Count(o => o.RECEIVE_NAME != null),
SHIPMENT = (x.SHIPMENT)
} );
return query;
SHIPMENT = (x.SHIPMENT)
Well you are within a grouping when you try to make that assignment - there are many shipments in each grouping not just one - in fact all shipments for that particular user. Assuming you want a collection of them you could do:
Shipments = g.Select( x=> x.SHIPMENT)
Edit:
If you just want the first shipment for each user (somewhat illogical but fits your data model):
SHIPMENT = g.Select( x=> x.SHIPMENT).First()