This article explains how to achieve that nice configuration where you can reuse your .NET EF Core (Entity Framework Core) entities in different projects – even being separate from the project holding your DbContexts! You might want to do this if you have a common data model between a number of very different projects – but you will still need to have a way to add new migrations, apply the…Continue reading How to run EF Core commands when your entities are in a different project from your dbcontext?
I’m using Entity Framework in most of the projects that I’m working on – and for the most part, it’s a pleasure to work with. But as always, there are plenty of chances to run into issues… So obviously, I stumbled into all of the rare stuff that IS broken! This one I hadn’t really seen before: “No database provider has been configured for this DbContext”. This time I encountered…Continue reading How to fix “No database provider has been configured for this DbContext” in EF Core?
Another quick one – I’m sure this doesn’t apply to all cases, but I’m still logging it in case someone (like myself) stumbles upon the issue and finds help here. I was building a solution with some Azure Functions fetching and populating data in a database, and was planning on building a UI for browsing the data at some point later on – but I actually got stuck on the…Continue reading “An assembly specified in the application dependencies manifest was not found” when running Add-Migration in Entity Framework Core?
This article explains how to perform a very simple and lightweight database connection test for an existing database context. A while ago, I needed to develop a simple API that I can poll from a load balancer to see whether: An Azure service hosting it is up and It has a connection to its SQL database This simple API would be used for monitoring purposes – simple stuff, sure, but…Continue reading How to verify connection to database in Entity Framework Core?
This time, I’m happy to present you perhaps the simplest way of fixing an annoying and persistent issue with a misleading error message! Wait, does that sound familiar? It’s almost like that’s what half of my articles are about… Anyway, I was happily going my way about creating a couple of new fields to an entity and then scaffolding my changes to a new migration using Entity Framework Core’s Add-Migration,…Continue reading How to resolve persistent “Build started… Build failed.” when trying to run Entity Framework Core commands?
This article offers yet another possible fix to an issue, where trying to call SaveChanges() in Entity Framework Core throws a pretty generic “An error occurred while updating the entries”-exception, and you’re left wondering what in tarnation is wrong this time. And admittedly, that’s a really generic error, so it could pretty much be whatever. But in this article, I’ll go through one possibility – hopefully, it helps! Problem So…Continue reading How to resolve another “An error occurred while updating the entries” exception in Entity Framework Core
Recently, while building an app service to host a .NET Core API, I had to implement the logic for using both Read-Only and Read-Write Database Contexts for Entity Framework Core. In this particular case, it was the same database – just different contexts, because depending on the location of the app service the app was deployed in, read and write operations might actually go to different database instances, That’s really…Continue reading How to implement multiple Connection Strings for one DbContext in EF Core?
This article describes how to access and extract the connection strings from your Entity Framework (Core) database context objects. This is quite convenient if you need to display or log the connection string used for your current DbContext for some reason – or if you somehow form your DbContext objects dynamically, and need to verify which connection string you’re using. I’m sure there are other use cases, too. You probably…Continue reading How to get the EF Core Connection String?
This is a tip that should often be the first thing you do in your projects with database backend, no matter which technology you use: Add some basic info about modified and created times, and the user information – so that if something happens, everyone will know who to blame 😉 There’s a lot of great blog articles describing how to do this in .NET Framework, but not that many…Continue reading How to add creator/modified info to all of your EF models at once in .NET Core
This post describes how you can access your Entity Framework Core model classes and the database context in your Azure Functions. In my example I’m using EF Core 2.1, but the main principle should be the same for later versions as well. Please note, that I use Azure functions runtime v2 (but it should work the same in v3 !) Another easy one, that I was unable to find much…Continue reading How to access Entity Framework Core’s DbContext in an Azure Function?