I have linq query as below
using (RMPortalEntities _RMPortalEntities = new RMPortalEntities()) {
var _RSVP_ButtonLocations = _RMPortalEntities
.tbl_RSVP_ButtonLocation
.Join(_RMPortalEntities.tbl_RSVP_Setting,
_RSVP_ButtonLocation => Guid.Parse(_RSVP_ButtonLocation.ID),
_RSVP_Setting => _RSVP_Setting.RSVP_Button_Location_ID,
(_RSVP_ButtonLocation, _RSVP_Setting) => new { _RSVP_ButtonLocation, _RSVP_Setting })
.Join(_RMPortalEntities.tbl_Event,
_RSVP_ButtonLocation_RSVP_Setting => _RSVP_ButtonLocation_RSVP_Setting._RSVP_Setting.EventID,
_Event => _Event.ID,
(_RSVP_ButtonLocation_RSVP_Setting, _Event) => new { _RSVP_ButtonLocation_RSVP_Setting, _Event })
.Where(x => x._Event.Active == true
&& x._Event.ID == _EventID)
.Select(x => new
{
RSVP_ButtonLocations = x._RSVP_ButtonLocation_RSVP_Setting._RSVP_ButtonLocation.RSVP_ButtonLocation
});
return _RSVP_ButtonLocations.FirstOrDefault().RSVP_ButtonLocations;
}
But problem is linq query does not allow me to convert string to Guid value.
Could anyone give me suggestion please?
Building on CjCoax comment you can store an instance of GUID and then use it later in the query:
using (RMPortalEntities _RMPortalEntities = new RMPortalEntities()) {
var GUID = new Guid(_RMPortalEntities.tbl_RSVP_ButtonLocation.ID);
var _RSVP_ButtonLocations = _RMPortalEntities
.tbl_RSVP_ButtonLocation
.Join(_RMPortalEntities.tbl_RSVP_Setting,
_RSVP_ButtonLocation => GUID,
_RSVP_Setting => _RSVP_Setting.RSVP_Button_Location_ID,
(_RSVP_ButtonLocation, _RSVP_Setting) => new { _RSVP_ButtonLocation, _RSVP_Setting })
.Join(_RMPortalEntities.tbl_Event,
_RSVP_ButtonLocation_RSVP_Setting => _RSVP_ButtonLocation_RSVP_Setting._RSVP_Setting.EventID,
_Event => _Event.ID,
(_RSVP_ButtonLocation_RSVP_Setting, _Event) => new { _RSVP_ButtonLocation_RSVP_Setting, _Event })
.Where(x => x._Event.Active == true
&& x._Event.ID == _EventID)
.Select(x => new
{
RSVP_ButtonLocations = x._RSVP_ButtonLocation_RSVP_Setting._RSVP_ButtonLocation.RSVP_ButtonLocation
});
return _RSVP_ButtonLocations.FirstOrDefault().RSVP_ButtonLocations;
}
Related
var ch = _context.xxtu_nintex_emp_data_v
.Where(o => o.LOGIN_USER_NAME ==userId.ToUpper())
.Select(emp => new
{ OTHERMOBILENO = emp.OTHERMOBILENO ?? "" })
.ToList().SingleOrDefault();
the result is
when use toList() I get what I want but it is so slow
var ch = _context.xxtu_nintex_emp_data_v.ToList()
.Where(o => o.LOGIN_USER_NAME ==userId.ToUpper())
.Select(emp => new
{ OTHERMOBILENO = emp.OTHERMOBILENO ?? "" })
.ToList().SingleOrDefault();
the result is
I use code first approach api and Microsoft.EntityFrameworkCore
Some things you could try
Call ToList after the condition, to only fetch a subset of data from the Database
var ch = _context.xxtu_nintex_emp_data_v
.Where(o => o.LOGIN_USER_NAME == userId.ToUpper())
.ToList() //<-- here
.Select(emp => new
{ OTHERMOBILENO = emp.OTHERMOBILENO ?? "" })
.ToList().SingleOrDefault();
Move the Select after the Last ToList call
var ch = _context.xxtu_nintex_emp_data_v
.Where(o => o.LOGIN_USER_NAME == userId.ToUpper())
//<-- re-arrange ToList/Select
.ToList()
.Select(emp => new { OTHERMOBILENO = emp.OTHERMOBILENO ?? "" })
//<--
.SingleOrDefault();
Re-arrange it a bit more
var emp = _context.xxtu_nintex_emp_data_v
.Where(o => o.LOGIN_USER_NAME == userId.ToUpper())
.SingleOrDefault();
var ch = new { OTHERMOBILENO = emp?.OTHERMOBILENO ?? "" };
I'm trying to perform a nested GroupBy using Linq and I'm not able to get it to work. My code is the following:
var summaryFile = new RemittanceCenterFilesSummaryListModel
{
RemittanceFilesSummary = remittanceCenterSummaryListModel.RemittanceBatchSummaryRecord.GroupBy(x => new { x.FileId, x.SourceFileName })
.Select(x => new RemitanceCenterFileSummarizedModel
{
FileId = x.Key.FileId,
SourceFileName = x.Key.SourceFileName,
Batches = x.ToList().GroupBy(b => new { b => b.BatchCode })
.Select(c => new RemittanceCenterBatchSummarizedModel
{
FileId = x.Key.FileId,
SourceFileName = x.Key.SourceFileName,
BatchCode = c.Key,
BatchType = c.Key,
DetailRecordCountAdc = x.Count(y => y.BillingSystemCode == BillingSystemCode.Adc),
DetailRecordCountNotAdc = x.Count(y => y.BillingSystemCode == BillingSystemCode.Exceed),
AmountAdc = x.Where(y => y.BillingSystemCode == BillingSystemCode.Adc).Sum(y => y.PaymentAmount),
AmountNotAdc = x.Where(y => y.BillingSystemCode == BillingSystemCode.Exceed).Sum(y => y.PaymentAmount),
AmountTotal = x.Sum(y => y.PaymentAmount),
});
ScannedBatchCount = x.Count(y => y.BatchType == "S"),
ScannedBatchAmount = x.Where(y => y.BatchType == "S").Sum(y => y.PaymentAmount),
NonScannedBatchCount = x.Count(y => y.BatchType != "S"),
NonScannedBatchAmount = x.Where(y => y.BatchType != "S").Sum(y => y.PaymentAmount),
}).ToList()
};
The first GroupBy is working correctly, however when I try to GroupBy the Batches field I'm getting the following build error:
Error 76 Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.
The error is highlighted here:
Batches = x.ToList().GroupBy(b => new { b => b.BatchCode })
Any suggestions ?
You mean
Batches = x.ToList().GroupBy(b => b.BatchCode)
There is no need to create an anonymous type if you want to group by only one property.
If you need an anonymous type, the syntax would be
Batches = x.ToList().GroupBy(b => new { b.BatchCode })
you used another lambda operator (b => new {b => b.BatchCode}) inside the anonymous type, which was invalid.
How do I group so that I don't loose the parent identifier.
I have the following
var grouped = mymodel.GroupBy(l => new { l.AddressId })
.Select(g => new
{
AddressId = g.Key.AddressId,
Quotes = g.SelectMany(x => x.Quotes).ToList(),
}).ToList();
this returns
{ AddressId1, [Quote1, Quote2, Quote3...]}
{ AddressId2, [Quote12, Quote5, Quote8...]}
Now I would like to group these by Quote.Code and Quote.Currency, So that Each address has 1 Object-Quote (that is if all 4 quotes belonging to the address have the same Code and Currency). I would like the sum of Currency in that object.
This works, but I can't get how to add Address to this result:
var test = grouped.SelectMany(y => y.Quotes).GroupBy(x => new { x.Code, x.Currency }).Select(g => new
{
test = g.Key.ToString()
});}
this gives compile error, whenever i try to add AddressId to result:
var test1 = grouped.SelectMany(y => y.Quotes, (parent, child) => new { parent.AddressId, child }).GroupBy(x => new { x.Provider, x.Code, x.Currency, x.OriginalCurrency }).Select(g => new
{
test = g.Key.ToString(),
Sum = g.Sum(x => x.Price)
});
compiler error as well:
var test1 = grouped.Select(x => new { x.AddressId, x.Quotes.GroupBy(y => new { y.Provider, y.Code, y.Currency, y.OriginalCurrency }).Select(g => new
{
addr = x.AddressId,
test = g.Key.ToString(),
Sum = g.Sum(q => q.Price)
};
I would do that this way:
var grouped = mymodel.GroupBy(l => new { l.AddressId })
.Select(g => new
{
AddressId = g.Key.AddressId,
QuotesByCode = g.SelectMany(x => x.Quotes)
.GroupBy(x=>x.Code)
.Select(grp=>new
{
Code = grp.Key.Code,
SumOfCurrency=grp.Sum(z=>z.Currency)
}).ToList(),
}).ToList();
I have this Linq lambda expression which generates abnormally complex SQL select to database. Is it somehow possibility to simplify it?
var devices = db.Devices
.Where(a => a.active == true)
.Select(a => new DeviceToDisplay
{
Id = a.Id,
serialNumber = a.serialNumber,
deviceRegion = a.deviceRegion,
activeIP = a.IPaddresses.Where(b => b.active == true).Select(b => b.IPaddress1).FirstOrDefault(),
Wip = a.IPaddresses.Where(b => b.active == true).Select(b => b.W_IP).FirstOrDefault(),
Sip = a.IPaddresses.Where(b => b.active == true).Select(b => b.S_IP).FirstOrDefault(),
model = a.SPdatas.Where(c => c.model != "").OrderByDescending(c => c.collectionDate).Select(c => c.model).FirstOrDefault(),
firmware = a.SPdatas.Where(c => c.model != "").OrderByDescending(c => c.collectionDate).Select(c => c.firmware).FirstOrDefault(),
lastMPteamActivity = a.activityLogs.OrderByDescending(c => c.updatedDate).Select(c => c.updatedDate).FirstOrDefault(),
country = a.MPPinformations.Select(c => c.country).FirstOrDefault()
});
For a start, your linq query looks very complicated. Imagine how you would implement this by writing a SQL query for example.
A suggestion: you are writing things like:
a.IPaddresses.Where(b => b.active == true).
and
a.SPdatas.Where(c => c.model != "").OrderByDescending(c => c.collectionDate).
in multiple places.
Instead you could create an anonymous type. For example,
var foo = from x in sb.Devices.Where(a=> a.active)
select new { Id = x.ID,
IPAddress = a.IPaddresses.Where(b => b.active), ... }
You can then use foo to create your Devices object.
See if this is any better:
var devices = db.Devices
.Where(a => a.active == true)
.Select(a => new DeviceToDisplay {
Id = a.Id,
serialNumber = a.serialNumber,
deviceRegion = a.deviceRegion,
activeIP = a.IPaddresses.Where(b => b.active == true).FirstOrDefault(),
SPdata = a.SPdatas.Where(c => c.model != "").OrderByDescending(c => c.collectionDate).FirstOrDefault(),
lastMPteamActivity = a.activityLogs.OrderByDescending(c => c.updatedDate).Select(c => c.updatedDate).FirstOrDefault(),
country = a.MPPinformations.Select(c => c.country).FirstOrDefault()
})
.Select(a=> new DeviceToDisplay {
Id=a.Id,
serialNumber=a.serialNumber,
deviceRegion=a.deviceRegion,
activeIP=a.activeIP.IPaddress1,
Wip=a.activeIP.W_IP,
Sip=a.activeIP.S_IP,
model=a.SPdata.model,
firmware=a.SPdata.firmware,
lastMPteamActivity=a.lastMPteamActivity,
country=a.county
});
var residenceRep =
ctx.ShiftEmployees
.Include(s => s.UserData.NAME)
.Include(s => s.ResidenceShift.shiftName)
.Join(ctx.calc,
sh => new { sh.empNum, sh.dayDate },
o => new { empNum = o.emp_num, dayDate = o.trans_date },
(sh, o) => new { sh, o })
.Where(s => s.sh.recordId == recordId && s.o.day_flag.Contains("R1"))
.OrderBy(r => r.sh.dayDate)
.Select(r => new
{
dayDate = r.sh.dayDate,
empNum = r.sh.empNum,
empName = r.sh.UserData.NAME,
shiftId = r.sh.shiftId,
shiftName = r.sh.ResidenceShift.shiftName,
recordId,
dayState = r.o.day_desc.Split('[', ']')[1]
}).ToList();
I get an exception :
The LINQ expression node type 'ArrayIndex' is not supported in LINQ to
Entities
How i could find an alternative to Split('[', ']')[1] in this query
You must commit the query and do the split after loading the data:
var residenceRep =
ctx.ShiftEmployees
.Include(s => s.UserData.NAME)
.Include(s => s.ResidenceShift.shiftName)
.Join(ctx.calc,
sh => new { sh.empNum, sh.dayDate },
o => new { empNum = o.emp_num, dayDate = o.trans_date },
(sh, o) => new { sh, o })
.Where(s => s.sh.recordId == recordId && s.o.day_flag.Contains("R1"))
.OrderBy(r => r.sh.dayDate)
.Select(r => new
{
dayDate = r.sh.dayDate,
empNum = r.sh.empNum,
empName = r.sh.UserData.NAME,
shiftId = r.sh.shiftId,
shiftName = r.sh.ResidenceShift.shiftName,
recordId = r.sh.recordId,
dayState = r.o.day_desc,
})
.ToList()//Here we commit the query and load data
.Select(x=> {
var parts = x.dayState.Split('[', ']');
return new {
x.dayDate,
x.empNum,
x.empName,
x.shiftId,
x.shiftName,
x.recordId,
dayState = parts.Length > 1 ?parts[1]:"",
};
})
.ToList();
I had this Issue and the approach that I've chose was that get all element I wanted and save them into a List and then filter the actual data on that list.
I know this is not the best answer but it worked for me.