All Questions
66,601
questions
0
votes
0
answers
15
views
Dynamically create Entity,DbSet,Migration file,Migrator file and Tables
I want to dynamically generate the following components based on user input properties:
Entity Class: Create a C# class representing the entity with properties based on user input.
DbSet: Add a DbSet ...
0
votes
1
answer
26
views
C# Dictionary does not contain a definition for sum when using ulong [duplicate]
I have a Dictionary<string, DemoRecord> with DemoRecord having a field Size.
I now want to calculate the sum of all sizes using LINQ. Here's the example
public record DemoRecord(string Name, ...
1
vote
2
answers
33
views
Cannot implicitly convert type 'System.Collections.Generic.List<<anonymous type: decimal SSN, string FullName>>' to 'System.Collections.Generic.List<>
I got this error when I tried to make a method to return all users which have no users
CS0029 Cannot implicitly convert type 'System.Collections.Generic.List<<anonymous type: decimal SSN, ...
-2
votes
0
answers
45
views
Select rows from database using dapper dynamic and reconstruct into custom object list in C# [closed]
I am fetching data from the database using Dapper as a dynamic list.
ID
ATTR
ATTR_VALUE
1
A
CAR
1
B
BUS
1
C
TRUCK
2
A
CAR
2
B
BUS
2
C
TRUCK
I have tried mapping the above dynamic data to the ...
1
vote
1
answer
65
views
How to do an inner join?
I have an ASP.NET Core project where I am using Entity Framework to manage database queries. I want to know how I can do an INNER JOIN between two tables with Entity Framework, in this case the user ...
0
votes
1
answer
24
views
How to create LINQ, that selects lists from list of lists that they contain all elements of any list from other list of lists?
I could not find or figure out similar LINQ example.
For the example, I have 2 lists:
List<List<string>> cases = new List<List<string>>()
{
new List<string>() { "...
- 601
-3
votes
0
answers
43
views
Method does not translate to SQL when used in another method [closed]
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 ...
2
votes
2
answers
69
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
99
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
33
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
42
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
49
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