Access configuration object (appsettings.json) in library project

Question

I started a .net core web api project. I have one solution with the main project and many other project like DAL, Common etc.

I want to create a class in the Common project that will share configuration settings(appsettings.json) between my different library project. So, How can I acces Iconfiguration from that class ?

Is this a good way to do this ? Or should I create a class into the main project to get configuration data from other project ?

Have a look at [options pattern](https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-3.1) — Pavel Anikhouski, May 18 '20 at 18:42

score 1 · Answer 1 · answered May 18 '20 at 19:04

One way to do it would be to create a Configuration Model based on your section/subsection from your appsettings.json file, add the configuration section in your Startup.cs class, then you can use the built-in dependency injection to inject the configuration anywhere you would need it.

For Example

appsettings.json :

{
  "MyConfiguration" : {
     "Configuration1" : "1",
   }
}

Your configuration model:

public class MyConfiguration 
{
   public int Configuration1 { get; set; }
}

Then in the StartupClass in the ConfigureServices method you have to add

services.Configure<MyConfiguration>(configuration.GetSection("MyConfiguration"));
services.AddOptions();

And when you want to use that Configuration somewhere in the code, you would just inject it in the constructor like so:

public class SomeClass 
{
  private MyConfiguration MyConfiguration { get; }

  public SomeClass(IOptions<MyConfiguration> myConfigurationOptions)
  {
    MyConfiguration = myConfigurationOptions.Value;
  }

//... more code
}

Then you can access it

MyConfiguration.Configuration1

Yeah, I think his is the way i'm gonna follow even if I wanted to do this another way :) — NAL, May 19 '20 at 19:44

score 0 · Answer 2 · answered May 19 '20 at 06:43

You can add the file as a link in yout project.

Right click your project , then select "Add" ->"Existing Item..."
Choose the file that you want to add to the solution
Instead of hitting Enter or clicking the Add button, you need to click the down-arrow icon at the right edge of the Add button, and select "Add As Link".

Please refer to this link.

Access configuration object (appsettings.json) in library project

2 Answers2