Asp .Net Core 讀取appsettings.json配置文件

     Asp .Net Core 如何讀取appsettings.json配置文件？最近也有學習到如何讀取配置文件的，主要是通過 IConfiguration，以及在Program中初始化完成的。那么今天給大家介紹下具體如何讀取配置文件的。

 

首先創建一個讀取配置文件的公共類GetAppsetting，我們可以看下此時配置文件中的內容

{
  "GetSetting": {
    "option1": "value1_from_json",
    "option2": -1,
    "subsection": {
      "suboption1": "subvalue1_from_json",
      "suboption2": 200
    }
  },
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*"
}

 

 

在創建的GetAppsetting公共類中寫如下代碼

     

   /// <summary>
        /// 實例化、調用GetAppsetting（）
        /// </summary>
        /// <param name="builder"></param>
        public static void connection(IConfiguration build)
        {
            getvalue = new GetAppsetting(build);
        }
 
        /// <summary>
        /// 在類中進行連接
        /// </summary>
        public static GetAppsetting getvalue { get; private set; }
 
        /// <summary>
        /// 最終實例化GetAppsetting（配置文件），讀取到GetSetting下面的配置
        /// </summary>
        /// <param name="builder"></param>
        public GetAppsetting(IConfigurationbuild)
        {
            this.GetSettings = new GetSetting(build.GetSection("GetSetting"));
        }  
 
        public  GetSetting GetSettings { get; }
        /// <summary>
        /// 獲取配置下面的具體屬性的值
        /// </summary>
        public class GetSetting
        {
            public string option1 { get; }
            public GetSetting(IConfiguration Configuration)
            {
                this.option1 = Configuration.GetSection("option1").Value;
            }
        }

 

最后需要在Program中的Main函數中初始化

var Configuration = new ConfigurationBuilder()
             .Add(new JsonConfigurationSource { Path = "appsettings.json",  ReloadOnChange = true })
             .Build();
            GetAppsetting.connection(Configuration);


var a = GetAppsetting.getvalue.GetSettings.option1;//這樣我們就可以拿到配置文件中GetSetting下面的option1的屬性值了

 

 

參考： https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/configuration/?view=aspnetcore-2.2

            https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/configuration/options?view=aspnetcore-2.2

 

 

歡迎大家掃描下方二維碼，和我一起學習更多的知識😊