User Configuration Settings in .NET Core

Question

I spent all day yesterday researching this and cannot find any reasonable solution.

I\'m porting a .NET Framework project to .NET Core 2.0. The project used user setting

Answer 1

I created a static class that the user could access anywhere if needed. This isn't perfect but it is strongly typed, and only creates when the accesses the default property.

I was going to use DI to put the config into the properties of each class, but in some cases I wanted to have the class in the constructor.

Use:

public MainWindow()
{
    InitializeComponent();

    var t = AppSettings.Default.Theme;
    AppSettings.Default.Theme += "b";
    AppSettings.Default.Save();
}

The class:

using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace TestClient
{

    public class AppSettings
    {
        private AppSettings()
        {
            // marked as private to prevent outside classes from creating new.
        }

        private static string _jsonSource;
        private static AppSettings _appSettings = null;
        public static AppSettings Default
        {
            get
            {
                if (_appSettings == null)
                {
                    var builder = new ConfigurationBuilder()
                        .SetBasePath(Directory.GetCurrentDirectory())
                        .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

                    _jsonSource = $"{Directory.GetCurrentDirectory()}{Path.DirectorySeparatorChar}appsettings.json";

                    var config = builder.Build();
                    _appSettings = new AppSettings();
                    config.Bind(_appSettings);
                }

                return _appSettings;
            }
        }

        public void Save()
        {
            // open config file
            string json = JsonConvert.SerializeObject(_appSettings);

            //write string to file
            System.IO.File.WriteAllText(_jsonSource, json);
        }

        public string Theme { get; set; }
    }
}