Net Core Worker Windows 服务中的 EF Core DBContext

Question

我想要实现的是编写一个简单的 .net 核心后台工作者（.net 核心 3.1），我将数据写入 SQL 服务器数据库（通过 EF Core 3.1），而这个工作者是运行宁作为 windows 服务。

当我运行来自 Visual Studio 2019 的以下代码时，一切正常，但是当我发布（目标 win-x64）并将 .exe 注册为我的 win10 机器上的服务时，我得到以下异常：

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

对导致此问题的原因以及如何解决有任何想法吗？

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
)

Answer 1

我必须安装 win-x64 文件夹的已发布源，而不是 "publish" 文件夹才能使它真正起作用。即使我的目标运行时是 win-x64，这也会让我期望发布的结果会在 "publish" 文件夹中。

Release folder structure and confusing publish folder

Net Core Worker Windows 服务中的 EF Core DBContext

EF Core DBContext inside Net Core Worker Windows service

.net-core

entity-framework-core

background-service