Questions tagged [linq]
Language Integrated Query (LINQ) is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages. Please consider using more detailed tags when appropriate, for example [linq-to-sql], [linq-to-entities] / [entity-framework], or [plinq]
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Improving performance of contains method in ASP.NET MVC web application with large dataset
I have an ASP.NET MVC web application using C#, Visual Studio, and SQL Server. This is my code:
if (!string.IsNullOrEmpty(Name))
{
query = query.Where(x => x.PatientName.Contains(Name));
}
The ...
- 748k
0
votes
1
answer
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VB.NET: LINQ Query on DataTable - WHERE Id >=0
Hey people,
I am bugfixing an application for some friends of mine. They are using VB.NET and Windows Forms, while I am in team C#/WPF/ASP. My knowledge about LINQ is also very limited even if its ...
CommunityBot
- 1
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59
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How do I set SQL Provider in C# Linq
I changed the default collation of my SQL Server 2022 database (and all string objects that already existed) to Latin1_General_100_CI_AS_SC_UTF8.
Unfortunately, Linq seems unable to handle this ...
- 25.8k
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41
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2 LINQ queries use the same joins. Is there a way to "factor out" the joins and gain a performance benefit?
Here are two example queries:
var queryA =
from t1 in context.T1
join t2 in context.T2
where
tl.colA == desiredColAValue
select new ObjectA(valuesFromQueryA)
;
var queryB =
...
- 25.8k
3
votes
3
answers
3k
views
How to solve a SonarQube S3267 warning, "Loops should be simplified with "LINQ" expressions"
Consider the following code (which is a simplified version of my actual code):
static void Main(string[] args)
{
string[] data = { "one", "two", "three", "stop&...
- 931
2
votes
2
answers
39
views
How to handle the possibility of expected null properties in a LINQ were clause?
Consider the following C# Code Fragment:
public class Person
{
public int Id { get; set;}
public string? Name { get; set;}
public string? Description {get; set;}
}
List<Person>? ...
- 71.9k
1
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1
answer
52
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LINQ group with list inside shows only the first row
I have a view in the v_PortalProprietario database that returns in each line the name of the owners that are repeated and the accounts (Acertos) that are unique. I would like to make a query in Linq ...
- 7,027
55
votes
5
answers
33k
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Moqing Entity Framework 6 .Include() using DbSet<>
I'd like to give the background to this question. Skip if you like. For quite a while I've paid close attention to the on going debates on stackoverflow and elsewhere regarding testing of code as it ...
- 8,373
1
vote
1
answer
54
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C# linq Include OrderBy
I need some help sorting data by Included data. In the example below, I am returning a purchase order where I want to sort the purchase order line items by the line item id.
return await context....
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1
answer
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Insert prefix in a Xml string [duplicate]
I need to be able to write this Xml string:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:a="http://www.w3.org/2005/08/addressing"
...
- 13
-1
votes
1
answer
56
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Equals method never called by LINQ expression [duplicate]
My data class:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using static iText.StyledXmlParser.Jsoup.Select.Evaluator;
...
- 2,907
0
votes
2
answers
3k
views
Find Matching Fields of List and IEnumerable objects in C#
There is a long and tedious way I could perform the task I want to accomplish, but I am thinking there must be a way using Linq or some other neater more efficient technique to achieve this. I have a ...
- 748k
1
vote
4
answers
46
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&...
- 116k
0
votes
1
answer
59
views
Entity Framework Core : Include not working for many-to-many relationship
I'm having trouble with .Include() not working for many-to-many relationships in Entity Framework Core. My setup works fine for one-to-many relationships, but the related entities are not being loaded ...
- 30k
36
votes
4
answers
40k
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IQueryable order by two or more properties
I am currently ordering a list of custom objects using the IQueryable OrderBy method as follows:
mylist.AsQueryable().OrderBy("PropertyName");
Now I am looking to sort by more than one ...
- 4,923