All Questions
294
questions
1
vote
4
answers
47
views
Apply Group by to dictionary value
I have a Dictionary which key of string type and value of list of integer type, like this:
Dictionary<string, List<int>>.
Lets say I add elements to it:
Dictionary<string, List<int&...
- 23
-3
votes
1
answer
56
views
Group List by property
I have a List of purchases that looks something like this:
List<MyItem> l = new List<MyItem>();
l.Add(new MyItem(){person_id = 1, person_name = "Jim", shirt = "green", ...
- 1,127
0
votes
2
answers
133
views
LINQ group a list and exclude groups that contain a record with a field value
Having trouble setting up my lamda to exlude groups with a record that has a field with a value. My data example:
CTY ProcId ProcTyp ProcDate
ZZZ 23-015 INIT 2023-01-26T20:04:30
ZZZ 23-015 UPDATE ...
- 1,324
1
vote
1
answer
55
views
How to find duplicates in a LINQ Group collection
I want to write a LINQ query that will check whether there is duplication of User data in my InfoObject objects.
In the succeeding illustration, I want to group by Code (i.e., XYZ) and check whether ...
- 545
2
votes
1
answer
37
views
C# Datable grouped by two fields, putting 4 field into an array
I have a XLSX file that has 4 columns (id, form name, data, imagepath). My end goal is to group all these rows into concise groupings based on id and form name with an array of docs per form.
|ID ...
- 163
2
votes
1
answer
244
views
C# Linq GroupBy Return Default Value Instead Of Null
I have the following list. I'm trying to split it into odd & even lists using GroupBy:
var x = new int[] { 2, 4, 6, 8, 10 };
var y = x
.GroupBy(x => x % 2 == 0)
.Select(x => x.ToList())
...
- 1,135
1
vote
1
answer
126
views
How can I group by using the first character of the Last Name using LINQ?
I am trying to answer this question for class and I am having a bit of trouble understanding why things do and don't work. The inquiry I have is about the use of LINQ and group by.
This is the ...
- 11
0
votes
1
answer
154
views
GroupBy not working in .NET Core - same count in original and grouped list
I'm working on project in .NET Core 3.1, but the version is not relevant for this question because I have a problem with group by with simple examples.
My original query is long, so when I was in ...
- 513
1
vote
2
answers
127
views
LINQ - How to group by name from nested array
_id:"63624b321e78f38a3d6baf3e"
Taxes
[0] TaxName:CGST
Amount:9.0
[1] TaxName:SGST
Amount:8.0
_id:"63624b321e78f38a3d6baf3e"
Taxes
[1] TaxName:SGST
Amount:8.0
I need to ...
0
votes
3
answers
52
views
Linq group by condition
I provide the simple list as below :
var records = new List<BookRecord> {
new() {
Author = "Peter",
BookName = "Book A"
...
- 199
0
votes
3
answers
254
views
How to use linq to group a list of strings on only certain strings
example list of strings:
var test = new List<string>{
"hdr1","abc","def","ghi","hdr2","lmn","opq","hdr3","...
- 3
-1
votes
1
answer
618
views
EF Core Linq query with grouping: Why does DefaultIfEmpty() not work here?
I have two tables that I'm trying to group with the EF Core equivalent of a Left Join. Table "Orders" lists the total amount of orders placed for a given item in each month of the year:
...
- 635
-1
votes
1
answer
412
views
C# Group the objects of list by property
I'm very new to C# and bad at explaining, hope the given input and output data will help.
I have a JSON file that contains pairs of strings which are keys use to identify something. Each key can be ...
- 19
2
votes
1
answer
247
views
Isolate duplicate objects in a list of objects
Given a list of objects with possible duplicates, I can find plenty of examples of how to get a List<IGrouping<'a, MyObject>> or how to remove duplicates. But what I want to do is just ...
- 13.8k
0
votes
1
answer
97
views
LINQ query grouping without duplication of data
So I want to display an output that is group by two fields: SubsidiaryCode and AssetCreatedDate. My problem is it displays the grouping values redundantly.
I suspect it duplicates because of my Detail ...
- 57