[英]How to make the connection string available in a N-Tier ASP.NET MVC Core 1.0 App with Autofac
I wired the layer together via autofac modules .我通过 autofac modules将层连接在一起。 Big thanks to endeffects .
非常感谢endeffects 。 Here is the HowTo .
这是 HowTo 。 Now I'm trying to make the connection string available in the DAL layer.
现在我正在尝试使连接字符串在 DAL 层可用。 I tried to register the:
我试图注册:
Configuration (Microsoft.Extensions.Configuration)
From the Startup class but without any success.从Startup类但没有任何成功。
I have the following line in my ConfigureServices method in startup.cs:我在 startup.cs 的 ConfigureServices 方法中有以下行:
services.AddSingleton(serviceType => Configuration);
services.AddInstance<Microsoft.Extensions.Configuration.IConfiguration>(Configuration);
builder.Populate(services);
var container = builder.Build();
var serviceProvider = container.Resolve<IServiceProvider>();
return serviceProvider;
Then in my DAL, I access that via constructor injections like:然后在我的 DAL 中,我通过构造函数注入访问它,例如:
public MyDataContext(IConfiguration configurations)
I can then access that item and pull my connection info like:然后我可以访问该项目并提取我的连接信息,例如:
configurations["Data:MyConnection:ConnectionString"]
I'm not a fan of my DAL needing to know anything about the name of the connection string, I don't think that is part of it's repsonsibility.我不喜欢我的 DAL 需要知道有关连接字符串名称的任何信息,我认为这不是它的责任的一部分。 I prefer creating my own interface:
我更喜欢创建自己的界面:
So for instance I would create something like:因此,例如我会创建类似的东西:
public interface IConnectionSettings
{
public ConnectionStringSettings DataWarehouse { get; }
public ConnectionStringSettings Audit { get; }
public ConnectionStringSettings Logging { get; }
public ConnectionStringSettings Security { get; }
}
Then when I'm using Entity Framework with DI然后当我将实体框架与 DI 一起使用时
public class SecurityContext : DbContext
{
public SecurityContext(IConnectionSettings settings)
: base (settings.Name)
{
}
}
Or ADO.Net for some weird reason:或 ADO.Net 出于某种奇怪的原因:
public class LoggingDataAccess
{
private readonly string _connectionString;
public LoggingDataAccess(IConnectionSettings settings)
{
_connectionString = settings.Logging.ConnectionString;
}
public void SomeRawAdo()
{
using (var con = new Connection(_connnectionstring))
{
}
}
}
In my DI:在我的 DI 中:
public static class IocCOnfig
{
public static void Start()
{
var builder = new ContainerBuilder();
builder.Register(r => new ConnectionSettings
{
DataWarehouse = ConfigurationManager.ConnectionStrings["DataWarehouse"],
// etc
});
}
private class ConnectionSettings : IConnectionSettings
{
// implement interface...
}
}
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