Develop Reference

Aggregate of string on anonymous type

I want to concat multiple string value into single string with comma separated,i tried using aggregate function but it shows cannot convert string to how to fix this issue,
I tried below code
var res = (from e in WYNKContext.SurgeryAssigned.Where(x => x.CmpID == cmpid && x.IsCancelled == false)
select new
{
ID = e.SAID,
UIN = e.UIN,
SurgeryDate = e.SurgeryDate,
SurgeryID = e.SurgeryID,
Surgery = ((from st in WYNKContext.SurgeryTran.
Where(x => x.SurgeryID == e.SurgeryID)
select new
{
desc = icdmaster
.Where(x => x.ID ==
st.IcdSpecialityCode).Select(x =>
x.SpecialityDescription).FirstOrDefault(),
}).ToList()).Aggregate((a, b) => a.desc + "," + b.desc),
}).ToList();
I want Output like inside surgery property like = string1,string 2 ,etc....
without using aggregate i am getting as count in Surgery Property
var res = (from e in WYNKContext.SurgeryAssigned.Where(x => x.CmpID == cmpid && x.IsCancelled == false)
select new
{
ID = e.SAID,
UIN = e.UIN,
SurgeryDate = e.SurgeryDate,
SurgeryID = e.SurgeryID,
Surgery = (from st in WYNKContext.SurgeryTran.Where(x => x.SurgeryID == e.SurgeryID)
select new
{
icd = icdmaster.Where(x => x.ID == st.IcdSpecialityCode).Select(x => x.SpecialityDescription).FirstOrDefault(),
}).ToList(),
}).ToList();
also tried string join :
Surgery = string.Join(",", (from st in WYNKContext.SurgeryTran.Where(x => x.SurgeryID == e.SurgeryID)
select new
{
icd = icdmaster.Where(x => x.ID == st.IcdSpecialityCode).Select(x => x.SpecialityDescription).FirstOrDefault(),
}).ToList()),
but in output i am getting like this
Surgery ={ icd = CORNEA },{ icd = CATARACT/IOL }
can some one tell what i did wrong in string.join.....

The string class has a static method named Join, which takes in a collection of items and a string to join them with, which should work for you here.
If I'm reading your code correctly, it would look something like this:
Surgery = string.Join(",", WYNKContext.SurgeryTran
.Where(surgTran => surgTran.SurgeryID == e.SurgeryID)
.Select(surgTran => icdmaster
.Where(icd => icd.ID == surgTran.IcdSpecialityCode)
.Select(icd => icd.SpecialityDescription)
.FirstOrDefault())),

How to Select new model list after GroupBy mothod in Linq?

I want select grouped rows to a new model list.this is my code:
List<Model_Bulk> q = (from a in db.Advertises
join c in db.Companies on a.AdvertiseCompanyID equals c.CompanyID
where a.AdvertiseActive == true
&& a.AdvertiseExpireDate.HasValue
&& a.AdvertiseExpireDate.Value > DateTime.Now
&& (a.AdvertiseObjectType == 1
|| a.AdvertiseObjectType == 2)
select c)
.GroupBy(a => a.CompanyID).Select(a => new Model_Bulk
{
CompanyEmail = a.CompanyContactInfo.Email,
CompanyID = a.CompanyID,
CompanyName = a.CompanyName,
Mobile = a.CompanyContactInfo.Cell,
UserEmail = a.User1.Email,
categories = a.ComapnyCategories
}).ToList();
After group by, i can not use Select and naturally this syntax error raised:
System.Linq.IGrouping' does not contain a definition for 'CompanyContactInfo' and no extension method 'CompanyContactInfo' accepting a first argument of type
System.Linq.IGrouping' could be found (are you missing a using directive or an assembly reference?)
If i try with SelectMany() method.but the result will repeated and groupby method not work properly:
List<Model_Bulk> q = (from a in db.Advertises
join c in db.Companies on a.AdvertiseCompanyID equals c.CompanyID
where a.AdvertiseActive == true
&& a.AdvertiseExpireDate.HasValue
&& a.AdvertiseExpireDate.Value > DateTime.Now
&& (a.AdvertiseObjectType == 1
|| a.AdvertiseObjectType == 2)
select c)
.GroupBy(a => a.CompanyID).SelectMany(a => a).Select(a => new Model_Bulk
{
CompanyEmail = a.CompanyContactInfo.Email,
CompanyID = a.CompanyID,
CompanyName = a.CompanyName,
Mobile = a.CompanyContactInfo.Cell,
UserEmail = a.User1.Email,
categories = a.ComapnyCategories
}).ToList();

Instead of .SelectMany(a => a) you can use .Select(g => g.First()).That will give you the first item of each group.
(from a in db.Advertises
join c in db.Companies on a.AdvertiseCompanyID equals c.CompanyID
where a.AdvertiseActive == true && a.AdvertiseExpireDate.HasValue && a.AdvertiseExpireDate.Value > DateTime.Now && (a.AdvertiseObjectType == 1 || a.AdvertiseObjectType == 2)
select c)
.GroupBy(a => a.CompanyID)
.Select(g => g.First())
.Select(a => new Model_Bulk
{
CompanyEmail = a.CompanyContactInfo.Email,
CompanyID = a.CompanyID,
CompanyName = a.CompanyName,
Mobile = a.CompanyContactInfo.Cell,
UserEmail = a.User1.Email,
categories = a.ComapnyCategories
}).ToList();
Note that this might not be supported, if that is the case add an AsEnumerable call before .Select(g => g.First())

You should understand that after you do GroupBy() in your LinQ expresstion you work with a group so in your example it will be good to write like this:
List<Model_Bulk> q =
(from a in db.Advertises join c in db.Companies on a.AdvertiseCompanyID equals c.CompanyID
where a.AdvertiseActive == true
&& a.AdvertiseExpireDate.HasValue
&& a.AdvertiseExpireDate.Value > DateTime.Now
&& (a.AdvertiseObjectType == 1 || a.AdvertiseObjectType == 2)
select c)
.GroupBy(a => a.CompanyID)
.Select(a => new Model_Bulk
{
CompanyEmail = a.First().CompanyContactInfo.Email,
CompanyID = a.Key, //Note this line, it's can be happened becouse of GroupBy()
CompanyName = a.First().CompanyName,
Mobile = a.First().CompanyContactInfo.Cell,
UserEmail = a.First().User1.Email,
categories = a.First().ComapnyCategories
}).ToList();

Instead you could try something like this, instead of mixing query expressions and methods... (using FirstOrDefault() in the where / select as necessary)
(from a in db.Advertises
join c in db.Companies on a.AdvertiseCompanyID equals c.CompanyID
group a by new { a.CompanyId } into resultsSet
where resultsSet.AdvertiseActive == true && resultsSet.AdvertiseExpireDate.HasValue && resultsSet.AdvertiseExpireDate.Value > DateTime.Now && (resultsSet.AdvertiseObjectType == 1 || resultsSet.AdvertiseObjectType == 2)
select new Model_Bulk
{
CompanyEmail = resultsSet.CompanyContactInfo.Email,
CompanyID = resultsSet.CompanyID,
CompanyName = resultsSet.CompanyName,
Mobile = resultsSet.CompanyContactInfo.Cell,
UserEmail = resultsSet.User1.Email,
categories = resultsSet.ComapnyCategories
}).ToList();

linq after groupby unable to get column values

I am getting data from multiple tables by joining and i want to group data on particular column value but after group by statement i can access my aliases and their properties. What mistake i am making?
public List<PatientHistory> GetPatientHistory(long prid)
{
using(var db = new bc_limsEntities())
{
List<PatientHistory> result =
(from r in db.dc_tresult
join t in db.dc_tp_test on r.testid equals t.TestId into x
from t in x.DefaultIfEmpty()
join a in db.dc_tp_attributes on r.attributeid equals a.AttributeId into y
from a in y.DefaultIfEmpty()
where r.prid == prid
group new {r,t,a} by new {r.testid} into g
select new PatientHistory
{
resultid = r.resultid,
bookingid = r.bookingid,
testid = r.testid,
prid = r.prid,
attributeid = r.attributeid,
result = r.result,
Test_Name = t.Test_Name,
Attribute_Name = a.Attribute_Name,
enteredon = r.enteredon,
Attribute_Type = a.Attribute_Type
}).ToList();
return result;
}
}

You're doing this wrong way. As been said by Jon after grouping the sequences with aliases r,t,a doesn't exist. After grouping you receive the sequence g with sequances of r,t,a in each element of g. If you want get one object from each group (for example most recent) you should try this:
List<PatientHistory> result =
(from r in db.dc_tresult
join t in db.dc_tp_test on r.testid equals t.TestId into x
from t in x.DefaultIfEmpty()
join a in db.dc_tp_attributes on r.attributeid equals a.AttributeId into y
from a in y.DefaultIfEmpty()
where r.prid == prid
group new {r,t,a} by new {r.testid} into g
select new PatientHistory
{
resultid = g.Select(x => x.r.resultid).Last(), // if you expect single value get it with Single()
// .... here add the rest properties
Attribute_Type = g.Select(x => x.a.Attribute_Type).Last()
}).ToList();

I appreciated this question so I thought I would add another potential usage case. I would like feedback on what the cleanest approach is to getting table information through a group operation so that I can project later in the select operation. I ended up combining what the OP did which is to pass objects into his group clause and then used the g.Select approach suggested by YD1m to get table information out later. I have a LEFT JOIN so I'm defending against nulls :
// SQL Query
//DECLARE #idCamp as Integer = 1
//
//select *,
//(select
//count(idActivityMaster)
//FROM tbActivityMasters
//WHERE dftidActivityCategory = A.idActivityCategory) as masterCount
//FROM tbactivitycategories A
//WHERE idcamp = #idCamp
//ORDER BY CategoryName
int idCamp = 1;
var desiredResult =
(from c in tbActivityCategories
.Where(w => w.idCamp == idCamp)
from m in tbActivityMasters
.Where(m => m.dftidActivityCategory == c.idActivityCategory)
.DefaultIfEmpty() // LEFT OUTER JOIN
where c.idCamp == idCamp
group new {c, m} by new { m.dftidActivityCategory } into g
select new
{
idActivityCategory = g.Select(x => x.m == null ? 0 : x.m.dftidActivityCategory).First(),
idCamp = g.Select(x => x.c.idCamp).First(),
CategoryName = g.Select(x => x.c.CategoryName).First(),
CategoryDescription = g.Select(x => x.c.CategoryDescription).First(),
masterCount = g.Count(x => x.m != null)
}).OrderBy(o=> o.idActivityCategory);
desiredResult.Dump("desiredResult");
If I just use a basic group approach I get the results but not the extra column information. At least I can't find it once I group.
var simpleGroup = (from c in tbActivityCategories
.Where(w => w.idCamp == idCamp)
.OrderBy(o => o.CategoryName)
from m in tbActivityMasters
.Where(m => m.dftidActivityCategory == c.idActivityCategory)
.DefaultIfEmpty() // LEFT OUTER JOIN
where c.idCamp == idCamp
group m by m == null ? 0 : m.dftidActivityCategory into g
select new
{
// How do I best get the extra desired column information from other tables that I had before grouping
// but still have the benefit of the grouping?
// idActivityCategory = g.Select(x => x.m == null ? 0 : x.m.dftidActivityCategory).First(),
// idCamp = g.Select(x => x.c.idCamp).First(),
// CategoryName = g.Select(x => x.c.CategoryName).First(),
// CategoryDescription = g.Select(x => x.c.CategoryDescription).First(),
// masterCount = g.Count(x => x.m != null)
idActivityCategory = g.Key,
masterCount = g.Count(x => x != null)
});
simpleGroup.Dump("simpleGroup");
Please tear this up. I'm trying to learn and it just seems like I'm missing the big picture here. Thanks.
UPDATE : Cleaned up by moving the work into the group and making the select more straight forward. If I had known this yesterday then this would have been my original answer to the OP question.
int idCamp = 1;
var desiredResult =
(from c in tbActivityCategories
.Where(w => w.idCamp == idCamp)
from m in tbActivityMasters
.Where(m => m.dftidActivityCategory == c.idActivityCategory)
.DefaultIfEmpty() // LEFT OUTER JOIN
where c.idCamp == idCamp
group new { c, m } by new
{ idActivityCategory = m == null ? 0 : m.dftidActivityCategory,
idCamp = c.idCamp,
CateGoryName = c.CategoryName,
CategoryDescription = c.CategoryDescription
} into g
select new
{
idActivityCategory = g.Key.idActivityCategory,
idCamp = g.Key.idCamp,
CategoryName = g.Key.CateGoryName,
CategoryDescription = g.Key.CategoryDescription,
masterCount = g.Count(x => x.m != null)
}).OrderBy(o => o.idActivityCategory);
desiredResult.Dump("desiredResult");

Convert from query to method

How to convert following code to method operator:
var myOrders = from c in customers
where c.Field<string>("Region") == "WA"
from o in orders
where c.Field<string>("CustomerID") == o.Field<string>("CustomerID")
&& (DateTime)o["OrderDate"] >= cutoffDate
select new {
CustomerID = c.Field<string>("CustomerID"),
OrderID = o.Field<int>("OrderID")
};
---------or----------
var myOrders = from c in customers
where c.Region == "WA"
from o in orders
where c.CustomerID == o.CustomerID
&& o.OrderDate >= cutoffDate
select new {
CustomerID = c.CustomerID,
OrderID = o.OrderID
};
same code in object form

I'd actually rewrite this as a join - probably via intermediate variables:
var washingtonCustomers = customers.Where(c => c.Field<string>("Region") == "WA");
var recentOrders = orders.Where(o => (DateTime)o["OrderDate"] >= cutoffDate);
var query = washingtonCustomers.Join(recentOrders,
c => c.Field<string>("CustomerID"),
o => o.Field<string>("CustomerID"),
(c, o) => new {
CustomerID = c.Field<string>("CustomerID"),
OrderID = o.Field<int>("OrderID")
});

You can try with this code - based on IEnumerable<KeyValuePair<string, Int32>
public IEnumerable<KeyValuePair<string, Int32>> YourQuery(DateTime date, string code)
{
var result =
from c in customers
where c.Field<string>("Region") == code
from o in orders
where c.Field<string>("CustomerID") == o.Field<string>("CustomerID")
&& (DateTime)o["OrderDate"] >= date
select new
{
CustomerID = c.Field<string>("CustomerID"),
OrderID = o.Field<int>("OrderID")
};
return result;
}

Are you just wanting to use the functional Linq syntax instead of query syntax? That would look like:
var myOrders = customers
.Where(c => c.Region == "WA")
.SelectMany(c =>
orders
.Where(o => (o.CustomerID == c.CustomerID)
&& (o.OrderDate > cutoffDate))
.Select(o => new {
CustomerID = c.CustomerID,
OrderID = o.OrderID
})
);

LINQ Filter anonymous type based on IEnumerable values within type

I'm using LINQ to SQL like:
var b =
from s in context.data
select new
{
id = s.id,
name = s.name
myEnumerable = s.OneToMany
};
Where myEnumerable is of type IEnumberable<T> and I want to now get a subset of b based upon properties of the individual items of myEnumerable. For example, say <T> has properties Berry and BerryID, I would want to do something like:
b =
from p in b
where //p.myEnumerable.myType.BerryID== 13
select p;
I'm feel like I'm missing something easy...

Since myEnumerable is an IEnumerable you will have to do a where on that.
var filteredData = from p in listOfData
where p.InnerData.Where(b=>b.ID == 13).Count() > 0
select p;
If I understand what you are saying...this is if there is an ID = 13 in the Enumerable at all.

Are you looking to select p if any of the items in p.myEnumerable have BerryID equal to 13?
b = from p in b
where p.myEnumerable.Any(t => t.BerryID == 13)
select p;
Or are you looking to select p if all of the items in p.myEnumerable have BerryID equal to 13?
b = from p in b
where p.myEnumerable.All(t => t.BerryID == 13)
select p;
What exactly is the condition you want the items in p.myEnumerable to fulfill before you select p?

Keep only items with at least one item having BerryID equal to 13 in the collection.
var b = context.data
.Where(s => s.OneToMany.Any(i => i.BerryID == 13))
.Select(s => new { id = s.id, name = s.name, myEnumerable = s.OneToMany });
Keep only items with all item having BerryID equal to 13 in the collection.
var b = context.data
.Where(s => s.OneToMany.All(i => i.BerryID == 13))
.Select(s => new { id = s.id, name = s.name, myEnumerable = s.OneToMany });