ASP.Net Core 获取Json配置文件

Configuration文件夹内，存在UISetting.json文件

UISetting.json:

{
  "FontFamily": "Arial",
  "FontSize": "16",
  "Editor": {
    "Foreground": "Red",
    "Background": "Green"
  }
}

获取UISetting.json文件

1.创建UISetting类，用来表示配置信息

public class UISetting
{
    public string FontFamily { get; set; }
    public string FontSize { get; set; }
    public EditorSetting Editor { get; set; }
    public class EditorSetting
    {
        public string Foreground { get; set; }
        public string Background { get; set; }
    }
}

2.要访问配置文件，需要使用ConfigurationBuilder类，setBasePath必须是绝对地址

IConfiguration configuration = new ConfigurationBuilder()
        .SetBasePath(Directory.GetCurrentDirectory()+ @"\Configurations\")
        .AddJsonFile("UISetting.json", optional: true, reloadOnChange: true).Build();
         
string fontsize = configuration["FontSize"];
string background = configuration["Editor:Background"];
string background2 = configuration.GetSection("Editor")["Background"];    

依赖注入方式获取UISetting.json文件

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllersWithViews();
    
    IConfiguration configuration = new ConfigurationBuilder()
        .SetBasePath(Directory.GetCurrentDirectory()+ @"\Configurations\")
        .AddJsonFile("UISetting.json", optional: true, reloadOnChange: true).Build();

    services.Configure<UISetting>(configuration); 
}

namespace WebApplication.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;
        private readonly IOptions<UISetting> _uiSetting;

        public HomeController(ILogger<HomeController> logger,IOptions<UISetting> uiSetting)
        {
            _logger = logger;
            _uiSetting = uiSetting;
        }

        public async Task<IActionResult> Index()
        {
            var background = _uiSetting.Value.Editor.Background;           
            return View();
        }       
    }
}

Happy Ending