docker-compose -f example/standalone-mysql-8.yaml up

dotnet add package nacos-sdk-csharp-unofficial.Extensions.Configuration --version 0.2.6

<ItemGroup>
  <PackageReference Include="nacos-sdk-csharp-unofficial.Extensions.Configuration" Version="0.2.6" />
</ItemGroup>

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
       .ConfigureAppConfiguration((context, builder) =>
       {
         var c = builder.Build();
         var dataId = c.GetValue<string>("nacosconfig:DataId");
         var group = c.GetValue<string>("nacosconfig:Group");
         var tenant = c.GetValue<string>("nacosconfig:Tenant");
         var optional = c.GetValue<bool>("nacosconfig:Optional");
         var serverAddresses = c.GetSection("nacosconfig:ServerAddresses").Get<List<string();
                
         // 0.2.6版本之前，只支持这种方式
         builder.AddNacosConfiguration(x =>
         {
           x.DataId = dataId;
           x.Group = group;
           x.Tenant = tenant;
           x.Optional = optional;
           x.ServerAddresses = serverAddresses;
         });

         //// 0.2.6版本之后可以从配置文件读取Nacos的基本配置
         //builder.AddNacosConfiguration(c.GetSection("nacosconfig"));
         
       })
      .ConfigureWebHostDefaults(webBuilder =>
      {
        webBuilder.UseStartup<Startup>();
      });

{
 "Logging": {
  "LogLevel": {
    "Default": "Warning",
    "Microsoft": "Warning",
    "Microsoft.Hosting.Lifetime" :"Information"
  } 
 },
 "nacosconfig":{
  "Optional": false,
  "DataId": "msconfigapp",
  "Group": "",
  "Tenant": "ca31c37e-478c-46ed-b7ea-d0ebaa080221",
  "ServerAddresses": ["localhost:8848"]
 }
}

public class AppSettings
{
	public string Str { get; set; }

	public int Num { get; set; }

	public List<int> Arr { get; set; }

	public SubObj SubObj { get; set; }
}

public class SubObj
{
	public string a { get; set; }
}

public void ConfigureServices(IServiceCollection services)
{
  services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));
  services.AddControllers();
}

[ApiController]
[Route("api/[controller]")]
public class ConfigController : ControllerBase
{
  private readonly IConfiguration _configuration;
  private readonly AppSettings _settings;
  private readonly AppSettings _sSettings;
  private readonly AppSettings _mSettings;
  
  public ConfigController(
    IConfiguration configuration,
    IOptions<AppSettings> options,
    IOptionsSnapshot<AppSettings> sOptions,
    IOptionsMonitor<AppSettings> _mOptions
    )
  {
    _configuration = configuration;
    _settings = options.Value;
    _sSettings = sOptions.Value;
    _mSettings = _mOptions.CurrentValue;
  }
  
  [HttpGet]
  public string Get()
  {
    string id = Guid.NewGuid().ToString("N");
  
    Console.WriteLine($"============== begin {id} =====================");
  
    var conn = _configuration.GetConnectionString("Default");
    Console.WriteLine($"{id} conn = {conn}");
  
    var version = _configuration["version"];
    Console.WriteLine($"{id} version = {version}");
  
    var str1 = Newtonsoft.Json.JsonConvert.SerializeObject(_settings);
    Console.WriteLine($"{id} IOptions = {str1}");
  
    var str2 = Newtonsoft.Json.JsonConvert.SerializeObject(_sSettings);
    Console.WriteLine($"{id} IOptionsSnapshot = {str2}");
  
    var str3 = Newtonsoft.Json.JsonConvert.SerializeObject(_mSettings);
    Console.WriteLine($"{id} IOptionsMonitor = {str3}");
  
    Console.WriteLine($"===============================================");
  
    return "ok";
  }
}