C#.Net core 获取 Appsettings.json

```Json
{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "ConnectionStrings": {
    "YX": "[email protected]"
  },
  "AllowedHosts": "*",
  "ServiceUrl": "http://www.cnblogs.com/chuankang/"
}

//读取一级配置节点配置
//AppConfigurtaionServices.Configuration["ServiceUrl"];
//得到 http://www.cnblogs.com/chuankang/


//读取二级配置节点配置
//AppConfigurtaionServices.Configuration["ConnectionStrings:YX"];
//得到"[email protected]"

  //AppConfigurtaionServices.Configuration["ConnectionStrings:LogLevel"];
/*得到"{
      "Default": "Information",
      "Microsoft": "Warning",
      
  "Microsoft.Hosting.Lifetime": "Information" }"*/

C#类
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
需引用。

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
/// 

        /// 读取配置文件
        /// 
        public class AppConfigurtaionServices
        {
            public static IConfiguration Configuration { get; set; }
            static AppConfigurtaionServices()
            {
                //ReloadOnChange = true 当appsettings.json被修改时重新加载            
                Configuration = new ConfigurationBuilder()
                .Add(new JsonConfigurationSource { Path = "jsconfig1.json", ReloadOnChange = true })
                .Build();
            }
        }

注意，如果AppConfigurtaionServices类中抛出FileNotFoundException异常，说明目录下未找到appsettings.json文件，这时请在项目appsettings.json文件上右键——属性——将“复制到输出目录”项的值改为“如果较新则复制”即可。