I'm trying to do a filter "where" on the not selected elements and are not in the ViewModel
this is that I have:
var UserQuery = (from u in db.USER
join c in db.CONSULT on u.IdUser equals c.IdUser
select new UserSexViewModel { IdUser= c.IdUser, UserSex=u.Sex}).Distinct();
I want to filter later the variable UserQuery by any property belonging to the object CONSULT or object USER
for example, filter later by:
CONSULT.TypeConsul,
CONSULT.DateCreation,
USER.Name,
USER.Age, and many more...
something like this:
UserQuery.Where(q=>q.CONSULT.TypeConsul==2) or UserQuery.Where(q=>q.USER.Age>16)
How I can do this?
the LINQ Dynamic Query Library will help you.
please refer to http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx
var UserQuery = (from u in db.USER
join c in db.CONSULT on u.IdUser equals c.IdUser
select new UserSexViewModel { IdUser= c.IdUser, UserSex=u.Sex}).Distinct();
//pseudo code
var specification = PredicateBuilder.True<Consult>();//default: build from this
specification = PredicateBuilder.And(specification, x => x.TypeConsult == 2);
var additionalCriterias = ...;
specification = additionalCriterias == null || additionalCriterias.Length == 0
? specification
: GetComposedSpecification(additionalCriterias);
var users = UserQuery.Where(specification).ToList()
predicateBuilder # http://www.albahari.com/nutshell/predicatebuilder.aspx with many more examples
Related
I have two tables..
Student (StudentId,Name,FatherName)
Qualification (QualificationId,StudentId,DegreeName)
I have got data like this..
var myList = (from c in entities.Students
join q in entities.Qualifications on c.StudentId equals q.StudentId
select new {c.Name,c.FatherName,q.DegreeName}).ToList();
Now i want to filter myList more.. How can i do it, like..
var filteredList = myList.Select(c=> new Student
{
Name=c.Name,
FatherName=c.FatherName
//Degree=C.Degree
}).ToList();
The above Linq Query is not working if i want to get DegreeName also, My Question is how to further Filter myList.
Thanks.
var filteredList = myList.Where(i => i.FatherName == "Shahid").ToList();
Keep in mind since you called ToList() on the original query you are now filtering in memory. If you want to filter in the database then remove the ToList() on the first query and do it like this:
var myList = from c in entities.Students
join q in entities.Qualifications on c.StudentId equals q.StudentId
select new {
c.Name,
c.FatherName,
q.DegreeName
};
var filteredInDatabase = myList.Where(i => i.FatherName == "Shahid").ToList();
Hi I am trying to join multiple entities in CRM 2011 but I get and error saying: {"'xrmsm_sessionEnrollments' entity doesn't contain attribute with Name = 'xrmsm_termsid'."}. That is correct but I am joining the entity that have that attribute.
My Linq Query:
var query2 = from e in svsContext.xrmsm_sessionEnrollmentsSet
join s in svsContext.xrmsm_sessionsSet on e.xrmsm_SessionLookup.Id equals s.xrmsm_sessionsId
join ic in svsContext.xrmsm_institutionCoursesSet on s.xrmsm_institutionCourseLookup.Id equals ic.xrmsm_institutionCoursesId
join ts in svsContext.xrmsm_term_sessionsSet on e.xrmsm_termSessionLookup.Id equals ts.xrmsm_term_sessionsId
join t in svsContext.xrmsm_termsSet on ts.xrmsm_TermLookup.Id equals t.xrmsm_termsId
where (e.xrmsm_StudentLookup.Equals(studentlookup)
&& e.xrmsm_YearLookup.Equals(entity.GetAttributeValue("xrmsm_studentlookup"))
&& ic.xrmsm_institutionCoursesId == institutionCourseGuid
&& t.xrmsm_termsId == termGuid)
select new { sessionName = s.xrmsm_sessionsName, StudentName = e.xrmsm_studentsName, StudentId = e.xrmsm_StudentLookup.Name };
My original SQL query that works on SQL Server:
SELECT en.xrmsm_currentsessionenrollmentsname
,en.xrmsm_isreadonlyname
,en.xrmsm_sessionenrollmentsaverage
,en.xrmsm_sessionenrollmentsgrade
,en.xrmsm_sessionenrollmentsid
,en.xrmsm_sessionenrollments_id
,en.xrmsm_sessionlookup as sessionid
,en.xrmsm_sessionlookupname
,en.xrmsm_sessionsname
,en.xrmsm_studentlookup AS studentid
,en.xrmsm_studentlookupname
,en.xrmsm_studentsname
,en.xrmsm_termsessionlookup
,en.xrmsm_termsessionlookupname
,en.xrmsm_withdrawal
,en.xrmsm_yearaverage
,en.xrmsm_yeargrade
,en.xrmsm_yearlookup
,en.xrmsm_yearlookupname
FROM CoseyTest_MSCRM.dbo.Filteredxrmsm_sessionEnrollments as en INNER JOIN
CoseyTest_MSCRM.dbo.Filteredxrmsm_sessions crmsessions ON
(en.xrmsm_sessionlookup = crmsessions.xrmsm_sessionsid AND en.xrmsm_yearlookup = crmsessions.xrmsm_yearlookup)
INNER JOIN Filteredxrmsm_institutionCourses institutionCourses
on crmsessions.xrmsm_institutioncourselookup = institutionCourses.xrmsm_institutioncoursesid
Inner Join Filteredxrmsm_term_sessions as termsession
on en.xrmsm_termsessionlookup = termsession.xrmsm_term_sessionsid
Inner Join Filteredxrmsm_terms as terms
on termsession.xrmsm_termlookup = terms.xrmsm_termsid
where en.xrmsm_yearlookup = '4BA07BED-3F51-E211-8359-00155D004403'
and en.xrmsm_studentlookup = 'C844AF65-5B51-E211-8359-00155D004403'
and terms.xrmsm_termsid = 'D1D107B7-4551-E211-8359-00155D004403'
and institutionCourses.xrmsm_institutioncoursesid = '2121914E-4551-E211-8359-00155D004403'
Linq provider for CRM has some limitations. You can fount it here. Check if your query violates limitations.
Try having a look at the actual query that it is generating and run that in SQL, it may help understand what is going on.
It could be that something your doing in LINQ is not available in CRM as paramosh mentioned but I can't see anything that jumps out at me.
Thanks for all your responses. I did the following workaround.
Make a query that retrieve a list of all the Student enrollments
Use the Find method of the List<T> class to find if a record exist with the conditions I am searching for.
var query2 = (from e in svsContext.xrmsm_sessionEnrollmentsSet
join s in svsContext.xrmsm_sessionsSet on e.xrmsm_SessionLookup.Id equals s.xrmsm_sessionsId
join ic in svsContext.xrmsm_institutionCoursesSet on s.xrmsm_institutionCourseLookup.Id equals ic.xrmsm_institutionCoursesId
join ts in svsContext.xrmsm_term_sessionsSet on e.xrmsm_termSessionLookup.Id equals ts.xrmsm_term_sessionsId
join t in svsContext.xrmsm_termsSet on ts.xrmsm_TermLookup.Id equals t.xrmsm_termsId
where (e.xrmsm_StudentLookup.Equals(studentlookup))
select new
{
EnrollmentId = e.xrmsm_sessionEnrollments_id,
SessionId = s.xrmsm_sessions_id,
EnrollmentYear = e.xrmsm_YearLookup,
InstitutionCourseId = (Guid)ic.xrmsm_institutionCoursesId,
TermId = (Guid)t.xrmsm_termsId,
Student = e.xrmsm_StudentLookup
}).ToList();
var q = query2.Find(r => r.EnrollmentYear.Id == entity.GetAttributeValue<EntityReference>("xrmsm_yearlookup").Id
&& r.InstitutionCourseId == institutionCourseGuid
&& r.TermId == termGuid);
I have an array filled with long type values and for each value in the array I need to implement a query. I used foreach loop as you can see from the code below:
var result;
foreach(long id in PrdIdArr)
{
var mainQuery = (from o in db.OPERATIONs
join u in db.UNITs on o.OP_UNIT_ID equals u.UNIT_ID into smt
from s in smt
join x in db.XIDs on s.UNIT_ID equals x.UNIT_ID
where o.OP_OT_CODE == OtCode
where x.IDTYP_CD == "BSN"
where s.START_PRD_ID == id
where o.OP_UPD_DATE >= _StartDate
where o.OP_UPD_DATE <= _EndDate
select new
{
o.OP_ID,
o.OP_UPD_DATE,
x.EXTERNAL_ID,
o.OP_OS_CODE,
o.OP_START,
o.OP_ST_STATION,
s.START_PRD_ID
}).Take(_RowNumber);
//var result = mainQuery.ToList();
result.add(mainQuery.ToList());
}
data = this.Json(result);
data.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
return data;
However, I have a problem in my code; I have to define a main list just before the foreach loop so that I could add results of each query to the that main list. my question is: How can I define this list as you can see at the beginning of my code? Thanks for the help...
How can I define this list as you can see at the beginning of my code?
Make
new {
o.OP_ID,
o.OP_UPD_DATE,
x.EXTERNAL_ID,
o.OP_OS_CODE,
o.OP_START,
o.OP_ST_STATION,
s.START_PRD_ID
}
into a concrete type (say QueryResult, although something a little more specific than that), and then just declare
var result = new List<QueryResult>();
Also, you should consider turning
foreach(long id in PrdIdArr)
and
where s.START_PRD_ID == id
into
where PrdIdArr.Contains(s.Start_PRD_ID)
var result = new List<object>();
foreach(long id in PrdIdArr)
{
....
result.Add(mainQuery.ToList());
}
You could do this:
var result = PrdIdArr.Select(id =>
from o in db.OPERATIONs
join u in db.UNITs on o.OP_UNIT_ID equals u.UNIT_ID into smt
from s in smt
join x in db.XIDs on s.UNIT_ID equals x.UNIT_ID
where o.OP_OT_CODE == OtCode
where x.IDTYP_CD == "BSN"
where s.START_PRD_ID == id
where o.OP_UPD_DATE >= _StartDate
where o.OP_UPD_DATE <= _EndDate
select new
{
o.OP_ID,
o.OP_UPD_DATE,
x.EXTERNAL_ID,
o.OP_OS_CODE,
o.OP_START,
o.OP_ST_STATION,
s.START_PRD_ID
}
.Take(_RowNumber)
.ToList()
).ToList();
I highly recommend performing some Extract Method refactorings, as the code is pretty complex and hard to understand/mange this way.
Just create the anonymous type outside with the same property names and the correct type
var result = Enumerable.Range(0, 0).Select(x => new
{
OP_ID = 1,
OP_UPD_DATE = DateTime.Now,
EXTERNAL_ID = 1,
OP_OS_CODE = 1,
OP_START = DateTIme.Now,
OP_ST_STATION = "",
START_PRD_ID = 1,
}).ToList();
And in your loop call AddRange
result.AddRange(mainQuery.ToList());
I have 2 tables, and want to get records from 1 table and to "update" one of its fields from another table, and to pass final list of "Payment" objects somewhere. I cannot use anonymouse type, i need to get the list of proper typed objects.
There was a long way.
Got data:
var paymentsToShow = from p in paymentsRepository.Payments
join r in recordTypeRepository.RecordType
on p.RecordType equals r.Reference into p_r
where p.Customer == CustomerRef
from r in p_r.DefaultIfEmpty()
select new
{
Payment = p,
RecordType = r
};
var objList = paymentsToShow.ToList();
Change required field (basically, Payment.RecordTypeName is empty):
foreach (var obj in objList)
{
obj.Payment.RecordTypeName = obj.RecordType.Name;
}
Got list with correct type:
var paymentsList = from o in objList
select o.Payment;
Is there any way to get code shorter, to make required field update in the query or something else? I dont know where to look for.
I cannot change database.
You could do it like this:
var paymentsToShow = (from p in paymentsRepository.Payments
join r in recordTypeRepository.RecordType
on p.RecordType equals r.Reference into p_r
where p.Customer == CustomerRef
from r in p_r.DefaultIfEmpty()
select new
{
Payment = p,
RecordType = r
}).Select(x =>
{
x.Payment.RecordTypeName = x.RecordType.Name;
return x.Payment;
});
This will result in an IEnumerable<Payment>, so no anonymous type used.
What do I put in my order by?? I want to order by Name. I have moved the orderby after the distinct because I read that it needs to be done last.
var result = (from r in db.RecordDocs
where r.RecordID == recordID
select new
{
DocTypeID = r.Document.DocType.DocTypeID,
Name = r.Document.DocType.Name,
Number = r.Document.DocType.Number
}
).Distinct().OrderBy( );
Just do
.OrderBy(doc => doc.Name)
Another option, if you really prefer the query expression syntax would be to chain your query construction across multiple statements:
var query = from r in db.RecordDocs
where r.RecordID == recordID
select new
{
DocTypeID = r.Document.DocType.DocTypeID,
Name = r.Document.DocType.Name,
Number = r.Document.DocType.Number
};
query = query.Disctinct();
query = from doc in query orderby doc.Name select doc;
Since all of these methods are deferred, this will result in the exact same execution performance.