Entity Framework error in Visual Studio Code

Question

In Visual Studio Code I am creating a Web-Api written in C # and I am using various functions that the Entity Framework offers such as the DbContextOption and Dbset, but when I use dotnet build I get the following messages:

Error CS0246: Namespace or type name 'Dbset <>' not found (is a using directive or assembly reference missing?) Error CS0246: The name of the type or namespace 'DbContextOption <>' was not found (is a using directive or assembly reference missing?)

This is the file where the error occurs:

using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Mvc;
using System.Data;
namespace web_api_db.Models{
public class Conexion : DbContext{
    public Conexion(DbContextOption<Conexion> options) : base (options){}
        public Dbset<Medicine> Medicine {get;set;}
    }
 }

And this is the csproj file:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="5.0.9" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.9" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.6" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.tools" Version="5.0.9">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.3" />
    <PackageReference Include="Swashbuckle.AspNetCore" Version="5.6.3" />
    <PackageReference Include="Microsoft.Net.Http.Headers" Version="2.2.8" />
  </ItemGroup>
</Project>

Looks like a typo: Wrong: DbContextOption, correct: DbContextOptions - note the "s" at the end of the class name and Dbset vs DbSet. You should see this error in visual studio too and not only when running dotnet build. See: learn.microsoft.com/en-us/dotnet/api/… — Christoph Lütjen
– Christoph Lütjen, Commented Sep 13, 2021 at 15:10

Kirby · Accepted Answer · 2021-09-13 17:07:17Z

2

It's DbSet with a capital S.
It's DbContextOptions with plural form.

edited Sep 13, 2021 at 17:07

Kirby

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answered Sep 13, 2021 at 16:53

Vladyslav Dubovyi

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