.net core读取配置文件

先添加这两个开发包：

这是配置文件；

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "name": { "name": "testConfig" }
}

代码（.net core 6）：

ConfigurationBuilder configBuilder = new ConfigurationBuilder();
configBuilder.AddJsonFile("appsettings.json", optional: false, reloadOnChange: false);//, reloadonChange: false);
IConfigurationRoot config = configBuilder.Build();
//string name = config["name"];
//Console.WriteLine($"name={name}");
string proxyAddress = config.GetSection("Logging:LogLevel:Default").Value;
Console.WriteLine($"Address: {proxyAddress}");

控制台输出：

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.net 8.0 ：

IConfiguration config = new ConfigurationBuilder()
        //.SetBasePath(Directory.GetCurrentDirectory())
        .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
        //.AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json", optional: true)
        //.AddEnvironmentVariables()
        .Build()
        ;
 
var connStr = config.GetSection("ConnectionStrings:conn").Value;