ASP.NET Core讀取appsettings.json配置文件信息

1、在配置文件appsettings.json里新增AppSettings節點

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AppSettings": {
    "HttpUrl": "http://www.ehongcn.com",
    "Copyright": "山南遠宏科技有限公司"
  },
  "AllowedHosts": "*"
}

2、新建實體類AppSettings，通常建在公共類庫Common里

    public class AppSettings
    {
        public string HttpUrl { get; set; }
        public string Copyright { get; set; }
    }

3、在Startup類里的ConfigureServices配置

services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));

4、控制器或者業務類里使用

        private readonly AppSettings _appSettings;

        public HomeController(IOptions<AppSettings> appSettings)
        {
            _appSettings = appSettings.Value;
        }

        public IActionResult Index()
        {
            ViewData["Url"] = _appSettings.HttpUrl;
            return View();
        }

5、頁面上使用

@using Microsoft.Extensions.Options;
@using Demo.Common
@inject IOptions<AppSettings> Settings
@{
    ViewData["Title"] = "Privacy Policy";
}
<h1>@ViewData["Title"]</h1>

<p>版權所屬有 @Settings.Value.Copyright.</p>