如何使用ASP.NET Core 配置文件

public Startup(IConfiguration configuration)
{
       Configuration = configuration;
}

    //SetBasePath方法用来指定配置文件的所在地，env.ContentRootPath是获取或设置包含应用程序内容文件的目录的绝对路径。
    //AddJsonFile方法是使用JsonConfigurationSource来接收Json文件，并添加到ConfigurationBuilder中的Sources中
    //Build()调用
       var config=new ConfigurationBuilder().SetBasePath(env.ContentRootPath)
                  .AddJsonFile("appsettings.json")
                  .Build();
        Configuration = config;

public IActionResult Index()
{
     var config = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory())
                 .AddJsonFile("appsettings.json").Build(); 
     string value = config.GetConnectionString("MysqlConnection");
     
     string value2 = config.GetSection("Test").Value;
     
    return Content($"{value},Test:{value2}");
}

public IActionResult Index()
{
     var config = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory())
                 .AddJsonFile("appsettings.json").Build(); 
     string value = config.GetConnectionString("mysqlConnection");
     
     string value2 = config.GetSection("Test").Value;
     
    return Content($"{value},Test:{value2}");
}

{
    "Teacher": {
    "name": "Tom",
    "age": "12",
    "Students": [
      {
        "name": "Docker",
        "age": "13"
      },
      {
        "name": "Nginx",
        "age": "45"
      }
    ]
  }    	
}

public IActionResult Index()
{
   var config = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json").Build();
   string value = config.GetSection("Teacher:name").Value;
   //
   string value2 = config.GetSection("Teacher:Students:1:name").Value;
  
   return Content($"{value},Test:{value2}");
   
}

//appsetting.json
{
   "RedisConfig": {
    "host": "127.0.0.1",
    "MasterPort": "6379",
    "SlavePort": "6380",
    "PassWord": "wen123"
   }
}

public class RedisHelper:IRedis
{
   public string host { get; set; }
   
   public string MasterPort { get; set; }
   
   public string SlavePort { get; set; }
   
   public string PassWord { get; set; }
   
}

public IActionResult Index()
{
    var config = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory())
                 .AddJsonFile("appsettings.json").Build();
    //创建一个自带的ioc容器
    var collection = new ServiceCollection();
            collection.AddOptions().Configure<RedisHelper>(config.GetSection("RedisConfig"));
    RedisHelper redishelper = collection.BuildServiceProvider().GetService<IOptions<RedisHelper>>().Value;
    
    return Content($"host:{redishelper.host},MasterPort:{redishelper.MasterPort}");
}

services.AddOptions().Configure<RedisHelper>(Configuration.GetSection("RedisConfig"));

private RedisHelper _redis;

public HomeController(IOptions<RedisHelper> options)
{
       _redis = options.Value;
}

public IActionResult Index()
{
     return Content($"host:{_redis.host},MasterPort:{_redis.MasterPort}")；
}

//XMLDemo文件
<?xml version="1.0" encoding="utf-8" ?>
<Test>
  <mysqlConnectionStrings>sdfl</mysqlConnectionStrings>
  <test>
    <connection>sdfasdf</connection>
    <connection2>sdfdsafsfs</connection2>
  </test>
  <test2>
    <test3>
      <connection>dfgfdg</connection>
    </test3>
  </test2>
</Test>

public IActionResult Index()
{
     var config = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory())
                  .AddXmlFile("XMLDemo.xml").Build();
     var value = config.GetSection("mysqlConnectionStrings").Value;
     var value2 = config.GetSection("test:connection2").Value;

     return Content($"value:{value},value2:{value2}");