asp.net core 读取appsetting中的集合

1.首先在appsetting中定义集合  Roles

 

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "Roles": [
    {"key": "admin","value": "系统管理员"},
    {
      "key": "manageCourse",
      "value": "学科组长"
    },
    {
      "key": "ctr",
      "value": "教师"
    }

  ]

}

2.定义实体类  Roles.cs

 

 public class Roles
    {
        public string key { get; set;   }        
        public string value { get; set; }        
    }

3.在startup.cs中配置

public void ConfigureServices(IServiceCollection services)
{         
  services.Configure<List<Roles>>(this.Configuration.GetSection("Roles"));
}

 

4. controller中使用

 

 public class LoginController : Controller
    {
       private readonly List<Roles> _roles = null; //定义

        public IActionResult Index()
        {           
            _roles.ForEach(item => { Console.WriteLine(item.key + "<-->" + item.value);}   );          
            return View( );
        }  
     
       public LoginController(  IOptions<List<Roles>> Roles)
        {
            
            _roles =  Roles.Value; //依赖注入
        }
}

 5.在startUp.cs 中直接使用

 

  public static List<Roles>   typeList;
       
        public void ConfigureServices(IServiceCollection services   )
        {           
            typeList = Configuration.GetSection("Roles").Get<List<Roles>>() ;
            typeList.ForEach(item => Console.WriteLine($"s={item.Key}-{item.Value}"));
         }

 

 

6.请看输出结果