配置文件读取

依赖注入获得appsetting.json里的数据

  public class ConnectionStringOptions
  {
      public string? WriteConnection { get; set; }
      public List<string>? ReadConnectionList { get; set; }
  }

Program里：

builder.Services.Configure<ConnectionStringOptions>(builder.Configuration.GetSection("ConnectionString"));

 public A01_FirstController(ILogger<A01_FirstController> logger,ILoggerFactory loggerFactory,IOptionsMonitor<ConnectionStringOptions> CSoption)
 {
     _logger = logger;

     _loggerFactory = loggerFactory;
     _connectionStringOptions = CSoption.CurrentValue;

 }

或者还可以

ConnectionStringOptions csoption = new ConnectionStringOptions();

builder.Configuration.Bind("ConnectionStrings", csoption);