How to fix Add-Migration problem?
Hi, I am trying to add another entity to the database in my e-commerce solution which includes client and admin projects using Blazor WASM and Server, Asp.Net Core API, and data access projects. However, I am getting an error message as shown below: How…
.Net core application with EFCore using Sqlite DB on linux giving error "Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 14: 'unable to open database file'."
I'm running a simple .Net Core application on Linux using EFCore and SQLite, but I'm getting the following error: An exception occurred while iterating over the results of a query for context type 'ApplicationDbContext'. …
EntityFrameworkCore 7 SetProperty(avar,avalue) Unable to cast object of type 'System.Linq.Expressions.TypedParameterExpression' to type 'System.Linq.Expressions.LambdaExpression'.
My code: 1.Error ADal aDal = new ADal(); Func<AModel, float> p = property => property.Balance; aDal._databaseContext .ModelDbSet .Where(w => w.ID == 5) .Take(1) .ExecuteUpdate(e => e.SetProperty(p, 636)); Out error (Almost no answer…
EF Core .Net 8 error after TLS 1.0 was disabled.
The admins where I work have disabled TLS 1.0 but now all of a sudden, my .Net 8 app is getting the following error: Microsoft.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred…
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…
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…
Access failed to localdb using EFCore in vs2022
Hi, I created my first Avalonia UI app in MVVM pattern and already installed EFCore 8.0.6 in the project. But failed to access the localdb. My troubleshoot: Created a simple console project. No issue. See attached pic1. In Avalonia app, checked the…
My EmailConfirmed is not working
Hi, I'm new to this, so I'm not so good, your help is my pleasure, thank you. I am having a problem with login, the API emailConfirmed still works when I give it token and userId. As far as I know, the EmailConfirmed doesn't confirm itself. I think I…
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…
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…
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>…
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…
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
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. --->…
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…
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…
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…
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
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…
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…