将参数传递给 EntityFramework Core [重复]

Question

我需要连接几个看起来相同的数据库。当我引入数据库连接实例时，我想将 ConnectionString 名称作为参数传递。

上下文类

public class AppDbContext : DbContext
    {

        public AppDbContext(string test) : base(GetOptions(test))
        {

        }

        public DbSet<Cargo> Cargoes { get; set; }

        

        private static DbContextOptions GetOptions(string connectionString)
        {
            return SqlServerDbContextOptionsExtensions.UseSqlServer(new DbContextOptionsBuilder(), connectionString).Options;
        }

    }

启动

public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<AppDbContext>();
            services.AddControllers();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "API", Version = "v1" });
            });
        }

代码

[HttpGet]
        public Cargo Get()
        {
            var test2 = new AppDbContext("TEST");
            return _appDbContext.Cargoes.FirstOrDefault(c => c.Code == "code");
        }

Answer 1

我认为最好创建一个单独的上下文：

public class AnotherContext : AppDbContext 
{
 
}

现在你可以配置它们了：

services.AddDbContext<AppDbContext>(options =>
    options.UseSqlServer(Configuration.GetConnectionString("FirstConnStr")));

services.AddDbContext<AnotherContext>(options =>
    options.UseSqlServer(Configuration.GetConnectionString("SecondConnStr")));