Develop Reference

Combine duplicates in a list

In my current test project I'm looking to combine all objects in a list where one of their values is the same as in another object, I would then like to check the other values under these objects and combine them together, here's and example:
Object1
{
id = 111,
price1 = 10,
price 2 = 20
}
Object2
{
id = 222,
price1 = 10,
price 2 = 20
}
Object3
{
id = 111,
price1 = 30,
price 2 = 70
}
Object4
{
id = 444,
price1 = 15,
price 2 = 25
}
From the above Object1 and and Object3 would be combined based on their related 'id' value, their prices would then be combined and would result in the following object replacing Object1 and Object3 in a list:
NewObject
{
id = 111,
price1 = 40,
price 2 = 90
}
The end list would then look like this:
NewObject
{
id = 111,
price1 = 40,
price 2 = 90
}
Object2
{
id = 222,
price1 = 10,
price 2 = 20
}
Object4
{
id = 444,
price1 = 15,
price 2 = 25
}
So far I would go about obtaining the value using linq as follows:
Select all with the same id add thier values
Create new object with combined values for all obtained in step 1 and add to new list
Continue over list and if the 'id 'already exists in new list then ignore it as it's already been combined into the new list
Is there maybe a quicker easier way with a single LINQ statement?

var result = source
.GroupBy(x => x.id,
(key, values) => new {
id = key,
price1 = values.Sum(x => x.price1),
price2 = values.Sum(x => x.price2)
});

try group by
var combined = list.GroupBy(x => x.id, x => x).Select(x => new ListObj()
{
id = x.Key,
price1 = x.Sum(s => s.price1),
price2 = x.Sum(s => s.price2),
});
whole console app:
class Program
{
static void Main(string[] args)
{
var list = new List<ListObj>()
{
new ListObj()
{
id = 111,
price1 = 10,
price2 = 20
},
new ListObj()
{
id = 222,
price1 = 10,
price2 = 20
},
new ListObj()
{
id = 111,
price1 = 30,
price2 = 70
},
new ListObj()
{
id = 444,
price1 = 15,
price2 = 25
},
};
var combined = list
.GroupBy(x => x.id, x => x)
.Select(x => new ListObj()
{
id = x.Key,
price1 = x.Sum(s => s.price1),
price2 = x.Sum(s => s.price2),
});
Console.ReadKey();
}
}
public class ListObj
{
public int id { get; set; }
public int price1 { get; set; }
public int price2 { get; set; }
}

c# filling up empty records

need some help with my foreach to recongonize the empty record and fill the gap with "-";
let's say we have 30min, 45min, 90min, 120min and not 60min in the case:
It can count the total records of each id, let's say the maximum is 5, 30min, 45min, 60min, 90min and 120min.
if there are 3, then it could check which is missing and than can fill with "-".
Same ideia of the script.
List<Treatment> treatment = new List<Treatment>();
treatment.Add(new Treatment { id = 1, treatmentNameId = 11, duration = "30", price = 30 });
treatment.Add(new Treatment { id = 1, treatmentNameId = 11, duration = "45", price = 45 });
treatment.Add(new Treatment { id = 1, treatmentNameId = 11, duration = "60", price = 60 });
treatment.Add(new Treatment { id = 1, treatmentNameId = 2, duration = "30", price = 30 });
//treatment.Add(new Treatment { id = 1, treatmentNameId = 2, duration = "45", price = 45 });
treatment.Add(new Treatment { id = 1, treatmentNameId = 2, duration = "60", price = 60 });
var newList = (from t in treatment
select t)
.AsQueryable().ToList();
List<List> newList= new List<List>();
foreach (var item in newList)
{
if (item.duration == "30")
{
newList.Add(new List { treatmentNameId = item.treatmentNameId, thirtyMin = "30" });
}
if (item.duration == "45")
{
newList.Add(new List { treatmentNameId = item.treatmentNameId, fortyFive= "45" });
}
if (item.duration == "60")
{
newList.Add(new List { treatmentNameId = item.treatmentNameId, sixty= "60" });
}
}
The end result should like something as,
id:1 30, 45, 60, -
id:2 30, - , 60, 90
id:3 - , 45, -, 90
etc...
Many many thanks for the help.

I'm not going to provide a very detailed explanation of all this, but conceptually I'm just grouping by treatmentNameId and then doing something very similar to an outer join in SQL. If the group join comes up empty for the duration, I'm selecting '-' instead of the duration. Using anonymous types for brevity.
var durations = new[] {"15", "30", "45", "60"};
var results = treatments
.GroupBy(t => t.treatmentNameId).Select(group => new
{
treatmentNameId = group.Key,
durations = durations.GroupJoin(group, s => s, g => g.duration,
(s, grouping) => !grouping.Any() ? "-" : s)
});
foreach (var result in results)
{
Console.WriteLine(result.treatmentNameId + ": " + string.Join(", ", result.durations));
}
This results in:
11: -, 30, 45, 60
2: -, 30, -, 60
If you have problems with something more specific, I'd be happy to explain further.

Linq Age GroupBy Aggregate Count

I have problems getting the correct result of this linq.
var transactions = from trans in tblMemberInfo.AsEnumerable()
orderby trans.Field<Int32>("AGE") ascending
group trans by trans.Field<Int32>("AGE") into groupTrans
select new
{
ZeroToSix = groupTrans.Count(age => age.Field<Int32>("AGE") >= 0 && age.Field<Int32>("AGE") <= 6)
};
I have a data table which contains data below. now, I want to sum all the age count where
age is between 0 to 5.
AGE Count
0 6
1 6
2 7
3 5
4 5
5 20
6 5
7 5
8 5
9 5
10 5
I would like to see the result like this.
Age
ZeroToFive = 49
AboveSix = 25

Check this:
// mock data
var data = new List<dynamic> {
new { Age = 0, Count = 6 },
new { Age = 1, Count = 6 },
new { Age = 2, Count = 7 },
new { Age = 3, Count = 5 },
new { Age = 4, Count = 5 },
new { Age = 5, Count = 20 },
new { Age = 6, Count = 5 },
new { Age = 7, Count = 5 },
new { Age = 8, Count = 5 },
new { Age = 9, Count = 5 },
new { Age = 10, Count = 5 },
};
var age = new {
ZeroToFive = data.Where(x => x.Age < 6).Sum(x => x.Count),
AboveSix = data.Where(x => x.Age >= 6).Sum(x => x.Count)
};

Group by using linq (range + count)

var data = new[] {
new { Id = 0, Cat = 1, Price = 2 },
new { Id = 1, Cat = 1, Price = 10 },
new { Id = 2, Cat = 1, Price = 30 },
new { Id = 3, Cat = 2, Price = 50 },
new { Id = 4, Cat = 2, Price = 120 },
new { Id = 5, Cat = 2, Price = 200 },
new { Id = 6, Cat = 2, Price = 1024 },
};
var ranges = new[] { 10, 50, 100, 500 };
Needed output is grouped price count by equal or greater than the range used according categories.
(in one linq statement)
cat range count
-------------------------------------
1 10 2 (In 1. categories there is 2 item that price >= 10(range) [10;30])
2 10 4 (In 2. categories there is 4 item that price >= 10(range) [50;120;200;1024])
2 50 4 ....
2 100 3 ....
2 500 1 (In 2. categories there is 1 item that price >= 500(range) [1024])

Try this:
var data = new[] {
new { Id = 0, Cat = 1, Price = 2 },
new { Id = 1, Cat = 1, Price = 10 },
new { Id = 2, Cat = 1, Price = 30 },
new { Id = 3, Cat = 2, Price = 50 },
new { Id = 4, Cat = 2, Price = 120 },
new { Id = 5, Cat = 2, Price = 200 },
new { Id = 6, Cat = 2, Price = 1024 },
};
var ranges = new[] { 10, 50, 100, 500 };
var result = from r in ranges
from g in data
where g.Price >= r
select new {g.Cat, Price=r};
var groupedData =
from d in result
group d by new{d.Cat, d.Price} into g
select new{Cat=g.Key.Cat, Price=g.Key.Price, TotalCount=g.Count()};

This should work:
var values =
data.SelectMany(x => ranges.Where(y => x.Price >= y)
.Select(y => new { Record = x, Range = y }))
.GroupBy(x => new { Cat = x.Record.Cat, Range = x.Range })
.Select(x => new { Cat = x.Key.Cat, Range = x.Key.Range, Count = x.Count()});
Results:
{ Cat = 1, Range = 10, Count = 2 }
{ Cat = 2, Range = 10, Count = 4 }
{ Cat = 2, Range = 50, Count = 4 }
{ Cat = 2, Range = 100, Count = 3 }
{ Cat = 2, Range = 500, Count = 1 }

Need help Linq Query Group By + Count

I have following Table with records for ActivityLog:
ID, UserId, Category, Created
1 11 DeAssigned 05/10/2012
2 11 LogIn 05/11/2012
3 20 Assigned 06/15/2012
4 11 Assigned 06/10/2012
5 20 DeAssigned 06/13/2012
6 20 Assigned 07/12/2012
7 11 DeAssigned 07/16/2012
8 20 Assigned 08/15/2012
...
now i want to query the Table to create same struct the same Result such as this:
var data = new[] {
new { Month = "05", Assigned = 14, DeAssigned = 5, LogIn=1 },
new { Month = "06", Assigned = 5, DeAssigned = 2, LogIn=0 },
new { Month = "07", Assigned = 50, DeAssigned = 8, LogIn=0 },
new { Month = "08", Assigned = 15, DeAssigned = 1, LogIn=0 }
};
what i have achieved:
var result = (from l in repoA.GetAll()
where l.Created >= System.DateTime.Now.AddYears(-1)
group l by new { l.Created.Value.Month, l.Category }
into groups
orderby groups.Key.Month
select new
{
Month = groups.Key.Month,
Category = groups.Key.Category,
Count = groups.Count()
});
there is not optimal result but count all Activity's grouped by Month:
[0] {Month = 6, Category = Assigned, Count = 2}
[0] {Month = 6, Category = Designed, Count = 1}
[0] {Month = 6, Category = LogIn, Count = 1}
[0] {Month = 7, Category = Assigned, Count = 3}
How can i query my Table to Format my Result in "Horizontal Counted" format?

Or simplier:
var result = (from l in repoA.GetAll()
where l.Created >= System.DateTime.Now.AddYears(-1)
group l by l.Created.Month into groups
orderby groups.Key ascending
select new
{
Month = groups.Key,
Assigned = groups.Where(g => g.Category == "Assigned").Count(),
Deassigned = groups.Where(g => g.Category == "DeAssigned").Count(),
LogIn = groups.Where(g => g.Category == "LogIn").Count()
});