C# 具有多个数据库的存储库模式

我在windows服务中使用EF Core和Autofac上的存储库模式

我有一个服务需要连接十几个数据库，这些数据库具有相同的模式（相同的dbcontext），但只有不同的数据。 如何使用Autofac在我的服务中实现这一点？贝洛

public class ReportRepository : IReportRepository
    {
        private readonly ReportDbContext dbContext;

        public ReportRepository(ReportDbContext dbContext)
        {
            this.dbContext = dbContext
        }

        public SomeModel GetData()
        {
            return dbContext.SalesData;
        }
    }

    public class ReportService : IReportService 
    {
        private readonly IReportRepository reportRepositoryEUServer;

        public ReportService(IReportRepository reportRepositoryEUServer)
        {
            this.reportRepositoryEUServer = reportRepositoryEUServer
        }

        public SomeModelDto GenerateReport()
        {
            var euData =  reportRepositoryEUServer.GetData();
            // I need to call other servers (e.g LATAM) here and get the data and aggregate them with euData
        }       
    }

---

创建基本上下文，包括所有设置、数据库集等：

public abstract class BaseContext : DbContext
{
    public BaseContext(DbContextOptions options)
    : base(options)
    { }
    public DbSet<object> FirstSet { get; set; }
    ...
}

并在

Startup.cs

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<LATAMContext>(options => options.UseSqlServer(Configuration.GetConnectionString("LATAMConnectionString")));
    services.AddDbContext<EUContext>(options => options.UseSqlServer(Configuration.GetConnectionString("EUConnectionString")));

    // Autofac
    var builder = new ContainerBuilder();

    // needed only if you plan to inject ICollection<BaseContext>
    builder.RegisterType<LATAMContext>().As<BaseContext>();
    builder.RegisterType<EUContext>().As<BaseContext>();

    builder.Populate(services);


    return new AutofacServiceProvider(builder.Build());
}

现在您可以注入这两种上下文

public class ReportRepository : IReportRepository
{
    private readonly LATAMContext latamDbContext;
    private readonly EUContext euDbContext;

    public ReportRepository(LATAMContext latamDbContext, EUContext euDbContext)
    {
        this.latamDbContext = latamDbContext;
        this.euDbContext = euDbContext;
    }
}

或者如果您计划注入上下文集合

public class ReportRepository : IReportRepository
{
    private readonly ICollection<BaseContext> dbContexts;

    public ReportRepository(ICollection<BaseContext> dbContexts)
    {
        this.dbContexts = dbContexts;
    }
}

---

你的解决方案看起来不错，但不是我想要的。我只是给出了两个连接的示例。我有几十个这样的，硬编码会很糟糕。我会更新这个问题，因为一开始我的错误是没有提到这一点。检查：应该符合你的要求needs@Greg这是否适用于代码优先实体框架数据库迁移？@MbusoMkhize您可以指定用于迁移的上下文--context MyDbContext您是否检查了autofac文档中的装饰程序

public class ReportRepository : IReportRepository
{
    private readonly LATAMContext latamDbContext;
    private readonly EUContext euDbContext;

    public ReportRepository(LATAMContext latamDbContext, EUContext euDbContext)
    {
        this.latamDbContext = latamDbContext;
        this.euDbContext = euDbContext;
    }
}

public class ReportRepository : IReportRepository
{
    private readonly ICollection<BaseContext> dbContexts;

    public ReportRepository(ICollection<BaseContext> dbContexts)
    {
        this.dbContexts = dbContexts;
    }
}

var _euContext = dbContexts.FirstOrDefault(x => x is EUContext) as EUContext;
var _latamContext = dbContexts.FirstOrDefault(x => x is LATAMContext) as LATAMContext;