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CDCoding Dropletscodingdroplets.com7h ago · 12 min read

Unable to Create an Object of Type DbContext in EF Core: Causes and Fixes

You add an entity, run dotnet ef migrations add AddOrders, and the tooling stops dead: Unable to create an object of type 'AppDbContext'. For the different patterns supported at design time, see https

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EAEugene Atinbireayinenongre.hashnode.dev6d ago · 4 min read

How I Reduced Build Time from Over 5 Minutes to Under 30 Seconds by Consolidating 400+ Entity Framework Migrations

As developers, we often focus on optimizing application performance for our users, but we sometimes overlook something just as important our own developer experience. In our case, one of the biggest p

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Qqodorsqodors.hashnode.devJul 25 · 5 min read

The N+1 Query Problem in EF Core (And How to Spot It Before Production Does)

A page that felt fine in testing is slow in production. Same code, same query, but now it crawls. You open the SQL log and there it is — not one query, but two hundred. One to load the list, then one

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Qqodorsqodors.hashnode.devJul 22 · 6 min read

EF Core Is Already a Repository. Stop Wrapping It in Another One.

Open a lot of .NET projects and you'll find the repository pattern sitting on top of Entity Framework Core. IProductRepository, GetById, Add, Save, the whole set. Underneath, every method just calls t

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Qqodorsqodors.hashnode.devJul 10 · 5 min read

AsNoTracking: The EF Core Setting Your Read Queries Are Missing

Most of the queries in a typical app are reads. You fetch data, show it, and never change it. EF Core doesn't know that. By default it assumes every entity you load might be modified and saved back, s

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Qqodorsqodors.hashnode.devJul 9 · 6 min read

IQueryable vs IEnumerable: The Mistake That Loads Your Whole Table

You wrote a clean LINQ query. It filters down to ten rows. It runs fine in dev, and then in production it's slow and your database CPU is higher than it should be for such a small result. The query lo

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CDCoding Dropletscodingdroplets.comJul 3 · 10 min read

Migrating from EF Core 8 to EF Core 10 in ASP.NET Core: A Step-by-Step Guide

Most teams I work with stayed on EF Core 8 because it was the LTS release, and now they are looking at EF Core 10, the next LTS, and want to skip 9 entirely. That instinct is right, but it hides a tra

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CDCoding Dropletscodingdroplets.comJun 30 · 9 min read

The Entity Instance Cannot Be Tracked in ASP.NET Core: Causes and Fixes

If you have hit System.InvalidOperationException: The instance of entity type 'X' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked, you are lookin

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Qqodorsqodors.hashnode.devJun 20 · 6 min read