.net core 读取配置

在.net core中读取配置，我们通常的做法是通过IConfiguration进行读取，但使用的过程中感觉不是很方便。有一种通过映射的方式来读取配置，更加简洁明了

1.在appsettings.json中配置一个节点

"JWT": {
    "Issuer": "http://localhost:49999", //Token发布者
    "Audience": "http://localhost:49999", //Token接受者
    "IssuerSigningKey": "123456888jdij9999998989efect",   //密钥
    "AccessTokenExpiresMinutes": "30" //过期时间
  }

2.新建节点对应的实体类

   public class JWTModel
    {
        public string Issuer { get; set; }
        public string Audience { get; set; }
        public string IssuerSigningKey { get; set; }
        public int AccessTokenExpiresMinutes { get; set; }
    }

3.在ConfigureServices中完成注册

// This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<JWTModel>(Configuration.GetSection("JWT")); //JWT为appsettings.json中的节点名称 }

4.使用配置

       private  IOptions<JWTModel> _options;
       public TokenHelper(IOptions<JWTModel> options)   //通过构造函数注入
       {
            _options = options;
       }
       public string GetKey()
       {
            string key = _options.Value.IssuerSigningKey;   
            return key;
       }