如何在 asp.net 内核 6 中注入 IConfiguration

Question

There is no Startup.cs in the web/api application any more.

We used to be able to inject IConfiguration into that Startup class.

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration
    }
    ...
}

Now that those add service and configuration code is moved into Program.cs , what is the correct way to access configuration from there?

Answer 1

You could add the IConfiguration instance to the service collection as a singleton object in ConfigureServices :

 public void ConfigureServices(IServiceCollection service){ services.AddSingleton<IConfiguration>(Configuration);  // ...} }

This allows you to inject IConfiguration in any controllers or classes:

public class UserController{public UserController(IConfiguration configuration)

  // Use IConfiguration instance here}

Answer 2

As far as I can tell, they replaced it with a concrete instance of ConfigurationManager class which is a property of the WebApplicationBuilder.

In your Program.cs class there is a line of code:

 var builder = WebApplication.CreateBuilder(args);

You can then access the configuration from this builder instance:

 builder.Configuration.GetConnectionString("DefaultConnection");

I know this does not answer your "how to inject IConfiguration" question but I'm guessing you just want to be able to access your configuration settings. If not you can downvote my answer.

Answer 3

The IConfiguration can be accessed in the WebApplicationBuilder .

So no need to inject IConfiguration any more, it is now a property in the builder in Program.cs .

var builder = WebApplication.CreateBuilder(args);
var config = builder.Configuration;

builder.Services.AddInfrastructureServices(config);
builder.Services.AddPersistenceServices(config);