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Your startup project doesn't reference Microsoft.EntityFrameworkCore.Design

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c#

visual-studio

nuget

entity-framework-core

I have 2 projects in my solution, I have a project with Entity Framework Core installed:

enter image description here

And in the other ASP.NET Web API project I have these packages:

<?xml version="1.0" encoding="utf-8"?> <packages>   <package id="Antlr" version="3.5.0.2" targetFramework="net461" />   <package id="Microsoft.ApplicationInsights" version="2.5.1" targetFramework="net461" />   <package id="Microsoft.ApplicationInsights.Agent.Intercept" version="2.4.0" targetFramework="net461" />   <package id="Microsoft.ApplicationInsights.DependencyCollector" version="2.5.1" targetFramework="net461" />   <package id="Microsoft.ApplicationInsights.PerfCounterCollector" version="2.5.1" targetFramework="net461" />   <package id="Microsoft.ApplicationInsights.Web" version="2.5.1" targetFramework="net461" />   <package id="Microsoft.ApplicationInsights.WindowsServer" version="2.5.1" targetFramework="net461" />   <package id="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel" version="2.5.1" targetFramework="net461" />   <package id="Microsoft.AspNet.Mvc" version="5.2.4" targetFramework="net461" />   <package id="Microsoft.AspNet.Razor" version="3.2.4" targetFramework="net461" />   <package id="Microsoft.AspNet.TelemetryCorrelation" version="1.0.0" targetFramework="net461" />   <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net461" />   <package id="Microsoft.AspNet.WebApi" version="5.2.4" targetFramework="net461" />   <package id="Microsoft.AspNet.WebApi.Client" version="5.2.4" targetFramework="net461" />   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.4" targetFramework="net461" />   <package id="Microsoft.AspNet.WebApi.HelpPage" version="5.2.4" targetFramework="net461" />   <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.4" targetFramework="net461" />   <package id="Microsoft.AspNet.WebPages" version="3.2.4" targetFramework="net461" />   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.0" targetFramework="net461" />   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net461" />   <package id="Newtonsoft.Json" version="11.0.1" targetFramework="net461" />   <package id="System.Diagnostics.DiagnosticSource" version="4.4.1" targetFramework="net461" />   <package id="WebGrease" version="1.6.0" targetFramework="net461" /> </packages>

When I run Add-Migration in PMC:

Your startup project 'API' doesn't reference Microsoft.EntityFrameworkCore.Design. This package is required for the Entity Framework Core Tools to work. Ensure your startup project is correct, install the package, and try again.

I installed Microsoft.EntityFrameworkCore.Design in the startup project instead of the data project that will contain all the entities and now it works, is this how the project should be setup?

like image 619
el_pup_le Avatar asked Sep 27 '18 12:09

el_pup_le

People also ask

What is Microsoft EntityFrameworkCore design?

Microsoft. EntityFrameworkCore. Design contains all the design-time logic for Entity Framework Core. It's the code that all of the various tools (PMC cmdlets like Add-Migration , dotnet ef & ef.exe ) call into. If you don't use Migrations or Reverse Engineering, you don't need it.

Can I use Efcore with .NET framework?

You can use EF Core in APIs and applications that require the full . NET Framework, as well as those that target only the cross-platform .

What is Microsoft EntityFrameworkCore tools for?

The Entity Framework Core tools help with design-time development tasks. They're primarily used to manage Migrations and to scaffold a DbContext and entity types by reverse engineering the schema of a database.

2 Answers

I found the solution here.

In short, edit your csproj file, and add to your PropertyGroup section following entry:

<GenerateRuntimeConfigurationFiles>True</GenerateRuntimeConfigurationFiles>
like image 105
astrowalker Avatar answered Oct 02 '22 11:10

astrowalker

None of the options worked for me. But the one I tried on this topic worked: EF Core 3 design time migrations broken by Microsoft.EntityFrameworkCore.Design DevelopmentDependency

I just commented out the following after importing the package to the Data project:

<ItemGroup> <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="3.1.4" /> <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.1.5">   <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>   <!--<PrivateAssets>all</PrivateAssets>--> </PackageReference>

Thank you so much Microsoft by breaking the existing projects every time when you release a new .NetCore update!

like image 44
thus Avatar answered Oct 02 '22 11:10

thus
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