Question

我有2个控制器的app asp.net core web api app OracleController.cs

        [Route("api/[controller]")]
        public class OracleController : Controller
        {
            private readonly OracleDbContext _db;  
            public HeatsController(OracleDbContext context)
            {
                _db = context;
            }
            ...
            protected override void Dispose(bool disposing)
            {
                if (disposing)
                {
                    _db.Dispose();
                }
                base.Dispose(disposing);
            }
    }

SqlServerController.cs

        [Route("api/[controller]")]
        public class SqlServerController: Controller
        {
            private readonly SqlServerDbContext _db;  
            public HeatsController(SqlServerDbContext context)
            {
                _db = context;
            }
            ...
            protected override void Dispose(bool disposing)
            {
                if (disposing)
                {
                    _db.Dispose();
                }
                base.Dispose(disposing);
            }
    }

Startup.cs

public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped(_ => new OracleDbContext(Configuration["Data:OracleConnectionString"]));
            services.AddScoped(_ => new SqlServerDbContext(Configuration["Data:SqlServerConnectionString"]));
        }

SqlServerDBContext.cs

public class SqlServerConfig : DbConfiguration
    {
        public SqlServerConfig()
        {
            SetProviderServices("System.Data.SqlClient",
             System.Data.Entity.SqlServer.SqlProviderServices.Instance);
        }
    }

    [DbConfigurationType(typeof(SqlServerConfig))]
    public class SqlServerDbContext : DbContext
    {
        public SqlServerDbContext()
            : base("name=SqlServerDbContext")
        {
        }

        public SqlServerDbContext(string nameOrConnectionString) : base(nameOrConnectionString)
        {
        }

        ...

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            ...
        }
    }

应用启动后，我只能访问一个DBContext。例如，如果我从OracleController调用一些方法它工作正常但是SqlServerController的方法不起作用它们会抛出异常＆＃34;提供的SqlConnection不指定初始目录或AttachDBFileName。＆＃34;。如果我首先从SqlServerController调用方法，它的工作方式相同。

Answer 1

正如您在错误消息中看到的那样，您的连接字符串中缺少InitialCatalog属性。这需要指定EntityFramework应连接到哪个数据库并启动查询。

ASP WEB API多个DBContext

1 个答案: