SewerGenerator/SewerStammGen/HostBuilders/AddDBContextHostBuilderExtensions.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using SewerStammGen.EntityFramework;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SewerStammGen.HostBuilders
{
    static class AddDBContextHostBuilderExtensions
    {
        public static IHostBuilder AddDBContext(this IHostBuilder hostBuilder)
        {
            hostBuilder.ConfigureServices((context, services) =>
            {
                string connectionString = "";
                Action<DbContextOptionsBuilder> configureDbContext = null;
                string databaseToUse = context.Configuration.GetConnectionString("databaseToUse");
                Trace.WriteLine(databaseToUse);
                if (databaseToUse.Equals("default"))
                {
                    connectionString = context.Configuration.GetConnectionString("default");
                    configureDbContext = o => o.UseNpgsql(connectionString);
                }
                else if (databaseToUse.Equals("sqlite"))
                {
                    connectionString = context.Configuration.GetConnectionString("sqlite");
                    configureDbContext = o => o.UseSqlite(connectionString);
                }


                services.AddDbContext<SewerStammGenDbContext>(configureDbContext);
                services.AddSingleton<SewerStammGenDbContextFactory>(new SewerStammGenDbContextFactory(configureDbContext));
            });
            return hostBuilder;
        }
    }
}