Entity Framework Core

1 answer

How to exclude matching records in EF Core Database

I've been working on a project from a gentleman that is no longer on my team. We want to have the below code running as a Windows Service, running every 5 minutes (easy for me to do the Service). However, if we run the below code in our API, manually…

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muttBunch 80

answered

Hongrui Yu-MSFT 690 Microsoft Vendor

1 answer

A second operation was started on this context instance before a previous operation completed. This is usually caused by different threads concurrently using the same instance of DbContext

I have a project using Azure Function with ASP.NET Core 8 and Service Bus, for data access I use EF Core. I'm getting hit a lot and we still haven't found the cause of the error: "A second operation was started on this context instance before a…

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Pedro Otávio 20

accepted

Pedro Otávio 20

1 answer

Entity Framework bulk functionalities (bulk insert,bulk delete)

I'm currently working on an enterprise project that requires some logic for bulk functionalities using Entity Framework. We found a couple of options but both are under licence: EF. Core.BulkExtensions…

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Greivin Chaves 0

commented

David V. Corbin [Atmosera] 6

1 answer

Queries with EF Core causes 'Cannot continue the execution because the session is in the kill state'

Some EF Core queries are throwing the following error in our code : Cannot continue the execution because the session is in the kill state. Une erreur grave s'est produite pendant la commande actuelle. Les résultats devront être supprimés, le cas…

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Arthur Menétrey 0

commented

Arthur Menétrey 0

3 answers

Which is better to use, DbContext.Add() or DbSet.Add()?

Hi, If you allow, I would like to ask a question. In CRUD operations, we can add to the database in two ways: DbContext.Add(object) and DbSet.Add(object). Which one is more correct to use? public class Context : DbContext { public DbSet<Category>…

asked

Yalçın Mete 40

accepted

Yalçın Mete 40

3 answers

How to filter a query in EF Core using a Value Object (Email value object) and the filter using Contains method?

I'm using C# EF Core version 7. I have a value object called Email which contains a string Value getter property which will hold the email value, and i have entity called Person which have Id and email i have configuered my entity using fluent api as…

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Osama Al-qarutee 0

answered

Mobin Valikhani 0

1 answer

My listview is listing only the id instead of 3 items on the table

PLEASE HELP ME I am working on sqlite database , i have the following code in c# maui return (await conn.Table

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Gbenga Banuso Odumosu 40

edited the question

Rakesh Gurram 4,805 Microsoft Vendor

0 answers

System.Reflection.TargetInvocationException: "Expression 'dest => dest' must resolve to top-level member" when configuring AutoMapper profile

I'm encountering an exception when trying to configure AutoMapper in my ASP.NET Core application. The exception message is: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. --->…

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Julia Ohorodnichuk 0

commented

Ping Ni-MSFT 2,875 Microsoft Vendor

1 answer

Unable to create a DbContext' Error when Using EF Core in .NET 8 ClassLibrary Project

Hello everyone, I've developed a ClassLibrary project using .NET 8 and C#, and I've utilized EF Core 8 in it. I've defined my own models and context within it. However, when I attempt to use the add-migration command, I encounter this error: "Unable…

asked

Kamyab Faghih 20

accepted

Kamyab Faghih 20

1 answer

How do I store a negative TimeSpan in Entity Framework?

Hi all; I store shifts to events with a TimeSpan as the offset from the start of the event and another TimeSpan as the duration of the shift. The setup shift starts before the event (so everyone see the event as 11:00am - 4:00pm as desired while the…

asked

David Thielen 2,466

accepted

David Thielen 2,466

2 answers

EF Core 3.1 - System.InvalidOperationException: 'The entity type 'Pntbec03' requires a primary key to be defined. If you intended to use a keyless entity type call 'HasNoKey()'.'

Hello . I need to handle a EF Core Entity relating to a table , but without having EF managing all its columns , but just a subset of them. I have scaffolded the small database to which the table belongs into a DbContext , and I though I could create…

asked

leo del ciello 66

commented

Hongrui Yu-MSFT 690 Microsoft Vendor

2 answers

How to retrieve the any table from SQL DB and display dynamically in one page in asp.net core

Requirements are as below. 1. In single page of asp.net core, need to display any table data dynamically like jtable from jQuery plugin... With generic code with ado.net or web api orAPI or entity framework core

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phani sekhar 1

commented

Hutty 20

2 answers

Is it correct to make connection string dynamic?

Hi, I'm currently working on a project which need data from other databases. The database where I'll get the datas are depends on users. Now I want to make my connectionString dynamic. Is it correct to make connection strnig dynamic. The user will enter…

asked

Atilla Rüstəmli 20

edited the question

Zhi Lv - MSFT 32,056 Microsoft Vendor

0 answers

how to solve:An unhandled exception occurred while processing the request. SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Doctors_Users_UserId".

An unhandled exception occurred while processing the request. SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Doctors_Users_UserId". The conflict occurred in database "Diabetes2AppDb", table…

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karen matungwa 0

commented

Hongrui Yu-MSFT 690 Microsoft Vendor

0 answers

probleme mise a jour windows server 2019

bonjour, j'ai un probleme de mise a jour sous Windows Server 2019 mon serveur de domaine apres l'installation des mise a jour , j'ai recu deux messages d'erreurs j'ai besoin de votre aide svp 1- 2023-09 Mise à jour cumulative pour .NET Framework 3.5,…

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saber 0

commented

saber 0

2 answers

EF Core doesn't recognize many-to-many relationship

I have a many-to-many relationship, altough EF Core seems not to recognize it. The relationship exists between JobOffer and JobOfferTag. JobOffer inherits from BaseJobOffer. BaseJobOffer.cs public class BaseJobOffer { [Required] …

asked

iKingNinja 60

answered

Hongrui Yu-MSFT 690 Microsoft Vendor

2 answers

framework realated question

what is frame in framework for .net applicatons like .net framework 3.5 and what it indicates for frames

asked

Siddangoud Bharamagoudar 61

commented

Lan Huang-MSFT 27,956 Microsoft Vendor

5 answers

SQLAzure is not available for your selection of subscription and location

Hi Folks, Trying to use Azure for the first time, I'm using a normal account (i.e not free tier or student) but it is just for a hobby project. I'm following the tutorial here in order to deploy my EFCore webapi…

asked

Gary Frewin 25

commented

Jason Porter 1

2 answers

EF is not creating a MigrationsHistory table

Hi all; I've been using Entity Frameworks for some time with my app. And I just noticed, there is no MigrationsHistory table. I looked at the files in core/Migrations and none of them create a MigrationsHistory table. Why is it missing and how do I get…

asked

David Thielen 2,466

commented

Hongrui Yu-MSFT 690 Microsoft Vendor

1 answer

Invalid Argument while scaffolding DB2 schema EF 3.1

Hello. I am trying to scaffold a DB2 schema using the IBM.EntityFrameworkCore provider (version 3.1.0.300) on an AspNet Core 3.1 web application using EntityFramework Core 3.1. The scaffolding command line is the following : Scaffold-DbContext…

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leo del ciello 66

answered

leo del ciello 66

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712 questions with Entity Framework Core tags

How to exclude matching records in EF Core Database

A second operation was started on this context instance before a previous operation completed. This is usually caused by different threads concurrently using the same instance of DbContext

Entity Framework bulk functionalities (bulk insert,bulk delete)

Queries with EF Core causes 'Cannot continue the execution because the session is in the kill state'

Which is better to use, DbContext.Add() or DbSet.Add()?

How to filter a query in EF Core using a Value Object (Email value object) and the filter using Contains method?

My listview is listing only the id instead of 3 items on the table

System.Reflection.TargetInvocationException: "Expression 'dest => dest' must resolve to top-level member" when configuring AutoMapper profile

Unable to create a DbContext' Error when Using EF Core in .NET 8 ClassLibrary Project

How do I store a negative TimeSpan in Entity Framework?

EF Core 3.1 - System.InvalidOperationException: 'The entity type 'Pntbec03' requires a primary key to be defined. If you intended to use a keyless entity type call 'HasNoKey()'.'

How to retrieve the any table from SQL DB and display dynamically in one page in asp.net core

Is it correct to make connection string dynamic?

how to solve:An unhandled exception occurred while processing the request. SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Doctors_Users_UserId".

probleme mise a jour windows server 2019

EF Core doesn't recognize many-to-many relationship

framework realated question

SQLAzure is not available for your selection of subscription and location

EF is not creating a MigrationsHistory table

Invalid Argument while scaffolding DB2 schema EF 3.1