Error when configuring services - Adding Entity Framework Core to ASP.NET Core

Question

I have created an ASP.NET Core web application. I am trying to add Entity Framework Core to my solution.

I have installed the below nugets to the project.

"Microsoft.NETCore.App",
"Microsoft.AspNetCore.App"
"Microsoft.EntityFrameworkCore.SqlServer"

There is a DbSet defined in the Context.

In the startup class when i try to add the Db Context, I get the following error in the for "Configuration".

The Name Configuration does not exist in the current context.

My code is:

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<MyContext>(options => 
    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
}

I am following this article which doesn't say much about the configuration

Did you include the relevant IConfiguration Configuration property/field in the startup? — Nkosi
– Nkosi, Commented Jan 27, 2020 at 11:28
I suggest to you this link for resolve problem :stackoverflow.com/a/59653471/5576498 — Amin Golmahalleh
– Amin Golmahalleh, Commented Jan 27, 2020 at 11:40
@AminGolmahalle thank you for the reply. I am a newbie to .Net Core. I dont have a appSettings.json in the solution. There is a launchSetting.json under Properties. How should a add the ConnectionString? Should I create a new .json file in the solution for this? Please advise — sm101
– sm101, Commented Jan 27, 2020 at 12:38
@sm101 For learning about concpet asp.net core please see this link: stackoverflow.com/a/59701684/5576498 — Amin Golmahalleh
– Amin Golmahalleh, Commented Jan 27, 2020 at 13:06

Nkosi · Accepted Answer · 2020-01-27 11:38:49Z

5

The code sample is incomplete. The Configuration actually is a property of the Startup class. It is populated via constructor dependency injection.

public class Startup
{
    public IConfiguration Configuration { get; }

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddDbContext<MyContext>(options => 
        options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
    }

    //...
}

As mentioned on the last step of the article : the full code is available on https://github.com/aspnet/AspNetCore.Docs/tree/master/aspnetcore/data/ef-mvc/intro/samples/cu-final

edited Jan 27, 2020 at 11:38

Nkosi

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answered Jan 27, 2020 at 11:36

johey

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