Wanted to read from appsetting values:

  "CosmosConfig": {
    "EndPointUri": "1",
    "AuthorizationKey": "2",
    "DatabaseName": "3",
    "DatabaseContainer": "4"
  },

In repository class i want to retrieve the data, but receiving null object reference:

public abstract class Repository<TEntity> : IRepository<TEntity>, IDisposable where TEntity : Entity
{
    private readonly CosmosConfig _appSettings;

    private readonly Container _container;

    private readonly CosmosClient _cosmosClient;

    public abstract string DatabaseId { get; }

    public abstract string ContainerId { get; }

    public Repository(
        IOptions<CosmosConfig> appSettings,
        CosmosClient cosmosClient)
    {
        _appSettings = appSettings.Value;
        _cosmosClient = cosmosClient;
        _container = _cosmosClient.GetContainer(_appSettings.DatabaseId, _appSettings.DatabaseContainer);
    }

Program.cs where i try to read values:

var host = Host.CreateDefaultBuilder(args)
    .ConfigureAppConfiguration((hostingContext, config) =>
    {
        config.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
    })
    .ConfigureServices((hostContext, services) =>
    {
        services.Configure<CosmosConfig>(hostContext.Configuration.GetSection("CosmosConfig"));
    })
    .Build();

var serviceProvider = host.Services;

var mySettings = serviceProvider.GetRequiredService<IOptions<CosmosConfig>>().Value;