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]
86,609
questions
-3
votes
0
answers
27
views
Method does not translate to SQL when used in another method
Best regard. At this time we are carrying out a method that allows us to identify which data has been entered into a table and which has not. Because to do this within our logic, we must do a join, we ...
1
vote
1
answer
31
views
NHibernate - Problem with creating a custom Linq extension
I have such query in NH Linq:
var query = _session
.Query<Revision>()
.Join(
_session.Query<Document>(),
rev => rev.Document,
doc => doc,
(rev,...
- 121
2
votes
2
answers
65
views
Will LINQ Any() ever enumerate without arguments?
Given the following:
var nums = GetNums();
Console.WriteLine(nums.Any());
Console.WriteLine(string.Join(", ", nums));
static IEnumerable<int> GetNums()
{
yield return 1;
...
- 168
0
votes
3
answers
93
views
ORDER strings with LINQ Orderby [duplicate]
Please consider this code:
string str1 = "M"; // <---77
string str2 = "m"; // <---109
var list = new List<string>() {str1, str2};
list = list.OrderBy(a=>a).ToList()...
- 13.3k
0
votes
1
answer
32
views
C# - Dynamic predicate inside .Select() throws expection
I have next domain models:
public class UserTask
{
public int Id { get; set; }
public string Name { get; set; }
// ...
public virtual ICollection<TaskHistory> TaskHistories { get;...
- 542
0
votes
1
answer
32
views
How to check particular character present in it
Here is my code:
using System;
namespace HelloWorld
{
class Program
{
static void Main(string[] args)
{
string ContactEmail = "[email protected]";
...
- 71
0
votes
1
answer
43
views
how to show data in list from multiple join having lot of column of complex object/class
These are below tables. I can not modify it
Brand
Id Name IsRegisterd
1 ABC True
2 XYZ True
Product
Id Name BrandId Active Version
1 Soap ABC True 1.0
2 Soap ABC ...
- 71
0
votes
1
answer
41
views
C# Entity Framework Core - Get Parent with filtered child collections
I have approximately next domain models:
public partial class ParentEntity
{
public int Id { get; set; }
public string Name { get; set; } = null!;
public virtual ICollection<ChildA> ...
- 542
-2
votes
0
answers
46
views
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 ...
- 166
0
votes
1
answer
54
views
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 =
...
- 13
2
votes
2
answers
41
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>? ...
0
votes
0
answers
71
views
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 to SQL seems unable to handle this ...
- 1
-1
votes
1
answer
43
views
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
vote
1
answer
58
views
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....
- 35
-1
votes
1
answer
57
views
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;
...
- 403