How to add reference in ASP.NET Core project

Question

My first ASP.NET Core project.

I'm getting an error

Error CS0234 The type or namespace name 'Entity' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)

Used NuGet to add reference to Entity Framework Core. I believe that should have fixed it, but no luck.

As you can see, the lib is listed under the Dependencies node instead of the usual References node, if that matters. I've compared the csproj files and nothing stands out as obvious why one has a references node and the other doesn't.

You appear to have a lot of warnings about various dependencies - have you looked into those warnings? — Jon Skeet
– Jon Skeet, Commented Jul 5, 2019 at 16:21
Maybe you should replace System.Data.Entity with the right namespace Microsoft.EntityFrameworkCore... — Nikolaus
– Nikolaus, Commented Jul 5, 2019 at 16:24
@BWhite EF Core is added as a NuGet package, not a reference. The namespace is Microsoft.EntityFrameworkCore, not System.Data.Entity. Are you following an EF tutorial instead of an EF Core tutorial perhaps? Remove the explicit reference and change the namespace — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Jul 5, 2019 at 16:46

Nikolaus · Accepted Answer · 2019-07-06 13:00:34Z

3

In .net the Namespace for EntityFramework is System.Data.Entity, but that changed for EF Core: The right namespace is now Microsoft.EntityFrameworkCore so

using Microsoft.EntityFrameworkCore;

should fix it.

answered Jul 6, 2019 at 13:00

Nikolaus

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