.net Core 读取配置文件参数

using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace CoreApi.Common
{
    public class ConfigFunction
    {
        public static IConfiguration Configuration { get; set; }
        public static string GetConfig(string configName)
        {
            var builder = new ConfigurationBuilder()
           .SetBasePath(Directory.GetCurrentDirectory())
           .AddJsonFile("appsettings.json");
            Configuration = builder.Build();
            return Configuration[configName];
            //var a = Configuration[configName];
            //var aa = Configuration["SiteConfig:Info"];
        }
    }
}

appsettings.json 文件：

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=(localdb)\mssqllocaldb;Database=aspnet-CoreWeb-E8C77D58-03FF-413B-B3DF-48B1167BC0F6;Trusted_Connection=True;MultipleActiveResultSets=true"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "SiteConfig": {
    "Name": "LineZero's Blog",
    "Info": "ASP.NET Core 开发及跨平台，配置文件读取"
  },
  "AllowedHosts": "*"
}

 控制器中读取配置文件：

先创建配置文件的节点对象，然后注入

namespace CoreWeb.Models
{
    public class SiteConfig
    {
        public string Name { get; set; }
        public string Info { get; set; }
    }
}

 SiteConfig Config;
        public HomeController(IOptions<SiteConfig> option)
        {
            Config = option.Value;
        }

        public IActionResult Index()
        {
            var a = Config.Info;
            var b = Config.Name;
            Common.CommonFunction.GetConfig();
            return View();
        }

注意：

控制器中读取配置文件，要先在Startup.cs中的ConfigureServices方法中注入  services.Configure<SiteConfig>(Configuration.GetSection("SiteConfig"));