How to install entity framework core to asp.net core 3 project using visual studio code

Question

I'm creating a new MVC application using visual studio code and I want to add entity framework core to my project. My application is using the latest .net core 3 but when I tried to install package Microsoft.EntityFrameworkCore.SqlServer its show an error like this

Unable to resolve 'Microsoft.EntityFrameworkCore.SqlServer (>= 3.0.0)' for '.NETCoreApp,Version=v3.0'

How can I solve this issue?

I was using this 'dotnet add package Microsoft.EntityFrameworkCore.SqlServer --version 3.0.0' to install the package, I got this from nuget.org. But still not working. — codeken
– codeken, Commented Nov 11, 2019 at 14:14
@Fabjan HealtcarePortal is my project name and this is an asp.net core mvc project — codeken
– codeken, Commented Nov 11, 2019 at 14:18
Does your project have a reference to Microsoft.AspNetCore.All in it? It might be an incompatibility with that that's causing this problem. — Eifion
– Eifion, Commented Nov 11, 2019 at 14:34
@Eifion I don't have any reference in it, Entity Framework core should be the first reference for my project. — codeken
– codeken, Commented Nov 11, 2019 at 15:20

overcomer · Accepted Answer · 2019-11-13 08:49:13Z

1

ASP.NET Core 3.0 removes some assemblies that were previously part of the Microsoft.AspNetCore.App package reference.

You should add the package references for removed assemblies.

In XML project file:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <UserSecretsId>My-secret</UserSecretsId>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="3.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="3.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.0.0" />
  </ItemGroup>

</Project>

Take a look here.

edited Nov 13, 2019 at 8:49

answered Nov 11, 2019 at 15:21

overcomer

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3 Comments

codeken Over a year ago

when I try to copy it to .csproj and run dotnet restore, it gives me an error like this Unable to resolve 'Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore (>= 3.0.0)' for '.NETCoreApp,Version=v3.0' same also to all.

overcomer Over a year ago

It could be a problem of the local cache try on the console > dotnet nuget locals --clear all

codeken Over a year ago

still not working, I have searched all over the internet but all the same result.

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