默認(rèn)情況下讀取配置Configuration的默認(rèn)優(yōu)先級(jí)：ConfigureAppConfiguration(自定義讀取)>CommandLine(命令行參數(shù))>Environment(環(huán)境變量)>appsetting.json(默認(rèn)配置文件)>UseSetting的順序

原因：讀取配置的順序是后來(lái)者居上模式，后來(lái)注冊(cè)的會(huì)優(yōu)先被讀取到。

2. 獲取配置

2.1 獲取單個(gè)項(xiàng)

//值是數(shù)組
 var a0 = Configuration.GetSection("RabbitMQ:Hosts").Get<string[]>();
//獲取數(shù)組第一個(gè)
 var a0 = Configuration["RabbitMQ:Hosts:0"];
//值是int類(lèi)型
 var a1 = Configuration.GetValue<int>("RabbitMQ:Port");
//值是字符串
var a2 = Configuration.GetValue<string>("RabbitMQ:UserName");
var a2 = Configuration["RabbitMQ:UserName"];

2.2 映射項(xiàng)到模型類(lèi)

模型類(lèi)

    public class RabbitMQConfig
    {
        public const string RabbitMQ = "RabbitMQ";
        public string[] Hosts { get; set; }

        public int Port { get; set; }

        public string UserName { get; set; }

        public string Password { get; set; }

        public string VirtualHost { get; set; }
    }

appsettings

  "RabbitMQ": {
    "Hosts": [ "xxx.xxx.xxx.xxx" ],
    "Port": 5672,
    "UserName": "admin",
    "Password": "xxxxxx",
    "VirtualHost": "myQueue"
  }

2.2.1 注入模型類(lèi)

//startup配置 
services.Configure<RabbitMQConfig>(Configuration.GetSection(RabbitMQConfig.RabbitMQ));
//獲取數(shù)據(jù)
private readonly RabbitMQConfig _rabbitMQConfig;
public WeatherForecastController(IOptions<RabbitMQConfig> options)
{
    _rabbitMQConfig = options.Value;
}

2.2.2 映射項(xiàng)到模型類(lèi)

var info = new RabbitMQConfig();
Configuration.Bind(RabbitMQConfig.RabbitMQ, info);
//or                        
Configuration.GetSection(RabbitMQConfig.RabbitMQ).Bind(info);

到此這篇關(guān)于.NET Core讀取配置文件的文章就介紹到這了。希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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