如何在.NET核心中从appsettings.json读取分段值

{
  "DatabaseSettings": {
    "ConnectionString": "your-connection-string",
    "TimeoutSeconds": 30,
    "MaxConnections": 100
  }
}

using Microsoft.Extensions.Configuration;

...

var configuration = new ConfigurationBuilder()
    .SetBasePath(Directory.GetCurrentDirectory())
    .AddJsonFile("appsettings.json")
    .Build();

var databaseSettings = configuration.GetSection("DatabaseSettings")
    .Get<DatabaseSettings>();

public class DatabaseSettings
{
    public string ConnectionString { get; set; }
    public int TimeoutSeconds { get; set; }
    public int MaxConnections { get; set; }
}

string connectionString = databaseSettings.ConnectionString;
int timeoutSeconds = databaseSettings.TimeoutSeconds;
int maxConnections = databaseSettings.MaxConnections;