EF Core DBContext inside Net Core Worker Windows service

.net-core background-service entity-framework-core

Question

what I am trying to achieve is code a simple .net core background worker (.net core 3.1) where I write data to a SQL Server database (through EF Core 3.1) while this worker is running as a windows service.

When I run the below code from Visual Studio 2019, everything works, but when I publish (Target win-x64) and register the .exe as a service on my win10 machine, I get the following Exception:

Microsoft.Data.SqlClient is not supported on this platform.

Any thoughts on what is causing this and how to fix it?

Program.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Soteria.Common.Database;

namespace Soteria.Service
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args)
        {
            var host = Host.CreateDefaultBuilder(args)
                .UseWindowsService()
                .ConfigureServices((hostContext, services) =>
                {
                    var optionsBuilder = new DbContextOptionsBuilder<SoteriaDbContext>();
                    optionsBuilder.UseSqlServer("Server=.\\SQLEXPRESS;Database=Soteria;Trusted_Connection=True;");//,
                    services.AddScoped<SoteriaDbContext>(s => new SoteriaDbContext(optionsBuilder.Options));

                    services.AddHostedService<Worker>();
                });

            return host;
        }
    }
}

Worker.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Soteria.Common.Database;
using Soteria.Common.Messaging;
using Soteria.Common.Models;

namespace Soteria.Service
{
    public class Worker : BackgroundService
    {
        private readonly ILogger<Worker> _logger;
        private readonly IServiceScopeFactory _serviceScopeFactory;

        public Worker(ILogger<Worker> logger, IServiceScopeFactory serviceScopeFactory)
        {
            _logger = logger;
            _serviceScopeFactory = serviceScopeFactory;
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (!stoppingToken.IsCancellationRequested)
            {
                using var scope = _serviceScopeFactory.CreateScope();

                var dbContext = scope.ServiceProvider.GetRequiredService<SoteriaDbContext>();

                dbContext.Tests.Add(new Test() {Date = DateTime.Now});
                dbContext.SaveChanges();

                await Task.Delay(1000, stoppingToken);               
            }
        }  
    }
}

SoteriaDbContext.cs

using Microsoft.EntityFrameworkCore;
using Soteria.Common.Models;

namespace Soteria.Common.Database
{
    public class SoteriaDbContext: DbContext
    {
        public SoteriaDbContext(DbContextOptions<SoteriaDbContext> options)
            : base(options)
        {
        }

        public DbSet<Test> Tests { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {            
            modelBuilder.Entity<Test>().ToTable("Tests");
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.EnableSensitiveDataLogging(true);
        }
    }
}

Test.cs

using System;

namespace Soteria.Common.Models
{
    public class Test
    {
        public int? Id { get; set; }
        public DateTime Date { get; set; }
    }
}

Tests.sql

CREATE TABLE [dbo].[Tests]
(
    [Id] INT NOT NULL PRIMARY KEY IDENTITY, 
    [Date] DATETIME NOT NULL
)
1
0
1/15/2020 10:24:24 AM

Accepted Answer

I had to install the published sources of the win-x64 folder, and not the "publish" folder to make this actually work. This even though my target runtime was win-x64, which would have led me to expect the published result would be in the "publish" folder.

Release folder structure and confusing publish folder

0
1/17/2020 2:34:39 PM


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