Aspnetcore: IServiceProvider does not contain definition for CreateScope

[sethen]

I had a 1.0 project that I was upgrading to 2.0. I followed the migration guide found here: https://docs.microsoft.com/en-us/aspnet/core/migration/1x-to-2x/ -- the part of interest here is the bit about the CreateScope and the Move database initialization code. Seems as though this doesn't work as intended.

Even when creating a new project with dotnet new webApi and using dotnet restore and putting this code:

var host = BuildWebHost(args);

using (var scope = host.Services.CreateScope())
{
    var services = scope.ServiceProvider;

    try
    {
        // Requires using RazorPagesMovie.Models;
        SeedData.Initialize(services);
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "An error occurred seeding the DB.");
    }
}

host.Run();

in the Main function and trying to run it I get this error:

Program.cs(13,37): error CS1061: 'IServiceProvider' does not contain a definition for 'CreateScope' and no extension method 'CreateScope' accepting a first argument of type 'IServiceProvider' could be found (are you missing a using directive or an assembly reference?)

This seems like a pretty obvious issue that could be resolved. Seems strange that this code in the migration guide doesn't work in a 2.0 project built right out of the box? The CreateScope is simply not on the interface in question via host.Services.

[Tratcher]

It's an extension method.
https://github.com/aspnet/DependencyInjection/blob/88c3bd6fe2786dd759b4a6c6d7c410e895336b6c/src/DI.Abstractions/ServiceProviderServiceExtensions.cs#L125
Add using Microsoft.Extensions.DependencyInjection;

[sethen]

Ah, right you are. I sorted it now, thanks!