Developer technologies .NET Entity Framework Core

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Nuget restore task failed

I am seeing following error in the restore task: (command is restore ) C:\azp\agent\_work\1\s\source\R2T2CoreTests\R2T2CoreTests.csproj : error NU1101: Unable to find package Microsoft.VisualStudio.Web.CodeGeneration.Design. No packages exist with this…

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tarun k 405

edited the question

tarun k 405

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

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Fabien Ménager 0

2 answers

Inserting data in many to many relation ship in EF core

i have two tables 1-Employees (ID ,EmpName) 2- Project (ID,ProjectName) data is already inserted in boh tables ,there is many to many relationship between these two so middle table created in table i.e EmployeesProject now i want to insert data (keys of…

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Erum Mirza 6

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Bruce (SqlWork.com) 78,161 Volunteer Moderator

1 answer

What is the best way to store URI in EF/SQL Server?

Hi all; I have some properties in an Entity Framework class that are URIs. Is there a way to store them as a URI in the database? Or should I store them as a string? The underlying DB is SQL Database on Azure. thanks - dave

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David Thielen 3,211

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Tohid 0

1 answer

Microsoft.EntityFrameworkCore.DbUpdateConcurrencyException: The database operation was expected to affect 1 row(s), but actually affected 0 row(s); data may have been modified or deleted since entities were loaded.

I am using DDD architecture and the following code changes the aggregate Root (basically adds a comment which is an Entity to the aggregate Root). public sealed class AddCommentToPostCommandHandlers : ICommandHandler<AddCommentToPostCommand,…

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Arman Espiar 1

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Robert Eru 0

5 answers

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…

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Cenk 1,036

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Miyari 003 0

0 answers

Great grandchildren ThenInclude() is failing

I have the following query. In the code it's Signup.Effort.Parent var user = await context.AppUsers .Include(user => user.Following!) .ThenInclude(org => org.News) .Include(user => user.Interests) .Include(user…

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David Thielen 3,211

commented

George Stocker 0

4 answers

How to call stored procedure procedure using entity framework core?

I work on asp.net core entity framework I have csharp function done using ado dotnet stored proceure i need to convert it using entity framwork core with another meaning how to call stored proceure using entity framework core 6 and i don't need to use…

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Ahmed Abd El Aziz 315

answered

Gitanza 003 0

1 answer

Add-Migration works, but Update-Database says "no migrations to update". I tried deleting the Mig.. Folder

Visual Studio and EF Core problem. Migrations don't work. Add-Migration Title works to update the schema, but Update-Database in NuGet Command Console says that the db is already up to date, but the db does not have my new table in it. I tried…

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John Murphy 30

commented

Chris Fox 0

3 answers

I'm experiencing problems with EF and SQL Server when running on Azure Webservice. The same code runs fine from VS with same db.

If I turn debugging on and connect my VS to the process, the error doesn't occur. Also I can run the code just fine from Visual Studio towards the same database. I do not Lazy Load. All Queries ens with ToFirstAsync() or ToListAsync() and has a Select to…

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Tomas Ekenman 0

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Siva Nair 2,420 Microsoft External Staff Moderator

1 answer

Could not load type 'Microsoft.EntityFrameworkCore.Metadata.Internal.AdHocMapper'

I'm using .NET 8.0, Entity FrameworkCore 9.0.2, MySql.EntityFrameworkCore 9.0.0 and when I try to get data from the database I get the following error. How to resolve this problem? System.TypeLoadException: Could not load type…

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Misha Kurytsia 0

answered

chand thiru 0

2 answers

BulkInsert for Entity Framework Core

Entity Framework core now has ExecuteUpdate and ExecuteDelete for doing large updates and deletes But when is EF core going to get the much need BulkInsert that does the job of SQL SERVER's BCP There are third party tools, but they are very expense…

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Greg Frazer 0

answered

Jonathan Magnan 0

4 answers

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…

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Kamyab Faghih 70

edited an answer

TP 125.9K Volunteer Moderator

6 answers

Error: 'Package restore failed rolling back package change for' while running Scaffold-Dbcontext in Entity Framework Core 7.0.14

Hello, I'm working on a project using .NET Core 7 and encountering an issue when running Scaffold-DbContext with Entity Framework 7.0.14. The error message I'm getting is "there was an error running the selected code generator package restore failed…

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UMUT CAN 5

answered

Pavan Upadhye 0

1 answer

como corrigir erro framework 4.8 na instalação windows server 2016

Framework1002.jpg Bom dia Todos, estou com problema framework 4.8, quando vou instalar windows server 2016, ele reporta esse erro em anexo.

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Mutual - Documentos OneDrive 0

edited the question

Anonymous

1 answer

Cursor pagination for query based full-text search

I need to implement cursor based pagination on an endpoint which accepts a search query. The problem is that since rows will be ranked based on a relevance score derived from a full-text search in natural language, IDs won't be sequential. Does anyone…

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iKingNinja 120

commented

Anonymous

1 answer

Entity Framework with Dynamic Table Mapping Based on a Parameter (PostgreSQL Partitioning)

I am using Entity Framework with PostgreSQL and need a way to dynamically map a model to different tables based on a parameter. For example, I have a Cars model, and each company should have its own separate table: Cars_A for Company A Cars_B for…

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Florin 20

accepted

Florin 20

0 answers

Materialization Interceptor causing null navigation properties

I'm implementing IMaterializationInteceptor.InitializedInstance: https://learn.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.diagnostics.imaterializationinterceptor?view=efcore-9.0 If I access a navigation property on the object being…

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NATHAN B 0

commented

Jack J Jun 25,296

4 answers

Receiving chat messages with SignalR

I tested the SignalR solution in Xamarin Forms and .net core backend and it works great: https://montemagno.com/real-time-communication-for-mobile-with-signalr/ However, I am wondering how to keep receiving the messages when the app is in background…

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Stesvis 1,041

edited an answer

Bruce (SqlWork.com) 78,161 Volunteer Moderator

1 answer

Issue with saving single record the form saves multiple records until the modelstate is valid

I am using asp.net core 8 i have a popup form when i click submit with empty fields it returns required validation error and when i fill data in fields then submit again it save multiple records is sql database the number of time i click on submit…

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Asif_360 20

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AgaveJoe 30,126

Developer technologies | .NET | Entity Framework Core

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780 questions with Developer technologies | .NET | Entity Framework Core tags

Nuget restore task failed

Entity Framework bulk functionalities (bulk insert,bulk delete)

Inserting data in many to many relation ship in EF core

What is the best way to store URI in EF/SQL Server?

Microsoft.EntityFrameworkCore.DbUpdateConcurrencyException: The database operation was expected to affect 1 row(s), but actually affected 0 row(s); data may have been modified or deleted since entities were loaded.

How to fix Add-Migration problem?

Great grandchildren ThenInclude() is failing

How to call stored procedure procedure using entity framework core?

Add-Migration works, but Update-Database says "no migrations to update". I tried deleting the Mig.. Folder

I'm experiencing problems with EF and SQL Server when running on Azure Webservice. The same code runs fine from VS with same db.

Could not load type 'Microsoft.EntityFrameworkCore.Metadata.Internal.AdHocMapper'

BulkInsert for Entity Framework Core

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

Error: 'Package restore failed rolling back package change for' while running Scaffold-Dbcontext in Entity Framework Core 7.0.14

como corrigir erro framework 4.8 na instalação windows server 2016

Cursor pagination for query based full-text search

Entity Framework with Dynamic Table Mapping Based on a Parameter (PostgreSQL Partitioning)

Materialization Interceptor causing null navigation properties

Receiving chat messages with SignalR

Issue with saving single record the form saves multiple records until the modelstate is valid