Cannot convert lambda expression to type 'ServiceLifetime' because it is not a delegate type on Asp.net core 2.2

Question

Why do I get this error:

Cannot convert lambda expression to type 'ServiceLifetime' because it is not a delegate type [TokenAuthWebApiCore.Server]

on this line of code:

public virtual void SetUpDataBase(IServiceCollection services)
{
    // Add framework services.
        services.AddDbContext<SecurityContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("SecurityConnection"), sqlOptions => sqlOptions.MigrationsAssembly("TokenAuthWebApiCore.Server")));
}

This is how I use it:

public void ConfigureServices(IServiceCollection services)
{
    services.AddSingleton(Configuration);

    services.AddMvc();

    SetUpDataBase(services);

    // services.AddDbContext<SecurityContext>(options =>
    //      options.UseSqlServer(Configuration.GetConnectionString("SecurityConnection"), sqlOptions => sqlOptions.MigrationsAssembly("TokenAuthWebApiCore.Server")));

    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
}

public virtual void SetUpDataBase(IServiceCollection services)
{
    // Add framework services.
        services.AddDbContext<SecurityContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("SecurityConnection"), sqlOptions => sqlOptions.MigrationsAssembly("TokenAuthWebApiCore.Server")));
}

This are all my using statements

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.IdentityModel.Tokens;
using System.Text;

I am thinking probably this is because the tutorial I am following a tutorial for a different version of .net core and I am using .net core version 2.2. Can you please show me how to fix this? Thank you.

Answer 1

Not about version compatibility error.You need to implement DbContext in your project. When you make context class, you need to inherit context class from DbContext class.