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implementing Entity Framework Core Tracking Changes in Detached Entities - .NET 6

👀 Views: 90 💬 Answers: 1 📅 Created: 2025-06-09
entity-framework-core dotnet-6 c# C#

I'm attempting to set up I'm trying to figure out I've encountered a strange issue with I tried several approaches but none seem to work. I'm currently experiencing an scenario with Entity Framework Core where changes made to detached entities are not being tracked correctly when I try to save them back to the database. I am using .NET 6 with EF Core 6.0, and my scenario involves retrieving an entity, detaching it, modifying some properties, and then attempting to reattach and save the changes. Here's a simplified version of my code: ```csharp var entity = await _context.MyEntities.FindAsync(entityId); _context.Entry(entity).State = EntityState.Detached; // Modify the entity properties entity.SomeProperty = "New Value"; _context.MyEntities.Update(entity); await _context.SaveChangesAsync(); ``` When I run this code, I get the following behavior message: "The instance of entity type 'MyEntity' want to be tracked because another instance with the same key value for {'Id'} is already being tracked." I tried using `AsNoTracking()` when fetching the entity, but it didn't help. Additionally, I checked if my context is being used across multiple requests, which it is not. I also attempted to set the state of the entity to `EntityState.Modified` instead of using `Update`, but that didn’t resolve the scenario either. I need to know how to properly handle detached entities so that I can save changes back to the database without working with tracking issues. Any insights would be greatly appreciated! For context: I'm using C# on Windows. Any ideas what could be causing this? I'm developing on Windows 11 with C#. Any examples would be super helpful. Thanks for taking the time to read this!