.net core mvc 类库读取配置文件

 

appsettings.json，给类库项目引入 Microsoft.Extensions.Configuration 和 Microsoft.Extensions.Configuration.Json程序包，类库中加载appsettings.json配置文件代码如下：

{
  "ConnectionStrings": {
    "conn": "Server=localhost;port=3308;database=qdezge;uid=root;pwd=123456;"
  },
  "AppSettings": {
    "AccessKey": "111111",
    "SecretKey": "22222",
    "Bucket": "3333333",
    "Domain": "http://wwww.domain.com"
  },
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "wmUrl": "https://www.baidu.com"
}

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
using System;
using System.Collections.Generic;
using System.Text;

namespace Infrastructure
{
    /// <summary>
    /// 读取配置文件
    /// </summary>
    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 = "appsettings.json", ReloadOnChange = true })
            .Build();
        }
    }
}

　　

使用方法如下，读取数据库链接字符串

AppConfigurtaionServices.Configuration.GetConnectionString("conn"); 
//得Server=Server=192.168.10.254;port=3308;database=abc;uid=root;pwd=123456;

　　读取一级配置节点配置

AppConfigurtaionServices.Configuration["wmUrl"];
//得 https://www.baidu.com

　　读取二级子节点配置

AppConfigurtaionServices.Configuration["Appsettings:AccessKey"];
//得到 111111
AppConfigurtaionServices.Configuration["Appsettings:SecretKey"];
//得到 22222

　　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“始终复制”即可。