Configure startup to do this

Question

0.00/5 (No votes)

See more:

In my net core Web app I have an interface, a concrete class and a section in appsettings.json I would like to inject into the DI chain thus

Startup.cs
services.Configure<APIHost>(Configuration.GetSection("APIHosts"));
services.AddSingleton<IAPIHost,APIHost>();

I do this regularly with other sections of appsettings without a problem, the difference being, this is an array.

Here are the relevant files

IAPIHost.cs
namespace CommandsWebsite.Interfaces
{
    public interface IAPIHost
    {
        List<string> APIHosts { get; set; }
    }
}

APIHost.cs
namespace CommandsWebsite.Models
{
    public class APIHost : IAPIHost
    {
        public List<string> APIHosts {get;set;}
        
        public APIHost()
        {
        }
    }
}


appsettings.json
"APIHosts": ["NUC","M4V101","M4V102","M4V201","M4V202","M4V203"]

public TestController(IAPIHost APIHost)
{
	APIHost.APIHosts // always null
}

What I have tried:

Everything I show in code, If I inject IConfiguration the Controller and use the code below I get the array, but I would like it to happen using services.Configure

this.Configuration.GetSection("APIHosts").Get<List<string>>();

The APIHost.APIHosts List is always null.

Posted 26-Dec-21 22:29pm

pkfox

Updated 27-Dec-21 0:34am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

pkfox · Answer 1 · 2021-12-27T00:34:00

I have it sussed - you need a class that exactly matches the appsetting section

appsettings section
"APIHost": {
    "APIHosts": [ "NUC", "M4V101", "M4V102", "M4V201", "M4V202", "M4V203" ]
  }

public class APIHost : IAPIHost
    {
        public APIHost()
        {
        }

        public List<string> APIHosts {get;set;}
    }

And these lines in Startup.cs to bind the array

services.Configure<APIHost>(options => this.Configuration.GetSection("APIHost").Bind(options));
services.AddSingleton<IAPIHost,APIHost>();

And inject this in the Controller constructor

MyController(IOptions<APIHost> options)

and it works