如何在Dot Net Core 2.2中按用户创建DBContext/租户工厂

public class TenantDbContextFactory
{
    private readonly DbContextOptions<TenantDbContext> _options;

    public TenantDbContextFactory(DbContextOptions<TenantDbContext> options)
    {
        _options = options;
    }

    public TenantDbContext Create(string tenantId)
    {
        // 根据租户ID创建对应的DBContext
        var optionsBuilder = new DbContextOptionsBuilder<TenantDbContext>(_options);
        optionsBuilder.UseSqlServer(GetConnectionString(tenantId));

        return new TenantDbContext(optionsBuilder.Options);
    }

    private string GetConnectionString(string tenantId)
    {
        // 根据租户ID获取对应的数据库连接字符串
        // 可以根据具体的租户管理方式进行实现
        // 这里仅作示例，可以根据需要进行修改
        return $"Server=localhost;Database={tenantId}_Database;Trusted_Connection=True;";
    }
}

public void ConfigureServices(IServiceCollection services)
{
    // 注册租户工厂
    services.AddScoped<TenantDbContextFactory>();

    // 注册DBContext
    services.AddDbContext<TenantDbContext>(options =>
    {
        options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"));
    });

    // 其他服务配置...
}

public class SomeService
{
    private readonly TenantDbContextFactory _dbContextFactory;

    public SomeService(TenantDbContextFactory dbContextFactory)
    {
        _dbContextFactory = dbContextFactory;
    }

    public void DoSomething(string tenantId)
    {
        using (var dbContext = _dbContextFactory.Create(tenantId))
        {
            // 使用对应租户的DBContext进行操作
            // 可以执行数据库查询、更新等操作
        }
    }
}