.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;