<PackageReference Include="Microsoft.Extensions.Configuration" Version="10.0.9" />

Microsoft.Extensions.Configuration.ConfigurationManager

public sealed class ConfigurationManager : IConfigurationManager, IConfiguration, IConfigurationBuilder, IConfigurationRoot, IDisposable
Represents a mutable configuration object.
namespace Microsoft.Extensions.Configuration { public sealed class ConfigurationManager : IConfigurationManager, IConfiguration, IConfigurationBuilder, IConfigurationRoot, IDisposable { [System.Runtime.CompilerServices.Nullable(2)] public string this[string key] { [return: System.Runtime.CompilerServices.Nullable(2)] get; [param: System.Runtime.CompilerServices.Nullable(2)] set; } public IList<IConfigurationSource> Sources { get; } public ConfigurationManager(); public IConfigurationSection GetSection(string key); public IEnumerable<IConfigurationSection> GetChildren(); public void Dispose(); } }