webapi读取配置文件内容
作者:互联网
1.读取默认的配置文件appsettings.json
appsettings.json内容
{ "Logging": {"Default": "Information", "Microsoft": "Warning", }, "AllowedHosts": "*", "ConnectionString": "Server=.;Database=Carina;User ID=sa;Password=pass****;" }
public class WeatherForecastController : ControllerBase { private IConfiguration _configuration; private readonly ILogger<WeatherForecastController> _logger; //依赖注入configuration,就可以在controller中使用configuration了 public WeatherForecastController(ILogger<WeatherForecastController> logger, IConfiguration configuration) { _logger = logger; _configuration = configuration; // }
//读取单个值
var connectionStr =_configuration["ConnectionString"] ;
//var connectionStr =_configuration.GetValue<string>("ConnectionString")
//获取对象中的值
var connectionStr =_configuration["Logging:Default"] //返回”Information“
}
若要读出一个对象,需要先声明一个类,然后读取出来。若要依赖注入该配置文件对象,需要再startup类中声明
public class Logging{ public string Default{get;set;}, public string Microsoft{get;set} }
//controller类中
var config = _configuration.GetSection("logging1").Get<Logging>();
//若要依赖注入配置文件的对象。 //startup类 public void ConfigureServices(IServiceCollection services) { services.AddControllers(); services.Configure<Logging>(Configuration.GetSection("Logging")); } //controller类中 private IConfiguration _configuration; private Logging logging; private readonly ILogger<WeatherForecastController> _logger; public WeatherForecastController(ILogger<WeatherForecastController> logger, IConfiguration configuration, IOptions<Logging> options) { _logger = logger; _configuration = configuration; logging = options.Value; //logging对象即包含配置文件的信息 }
单独类读取配置文件信息
public static class ConfigurationManager { public readonly static IConfiguration Configuration; static ConfigurationManager() { Configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true) .Build(); } public static T GetSection<T>(string key) where T : class, new() { return new ServiceCollection() .AddOptions() .Configure<T>(Configuration.GetSection(key)) .BuildServiceProvider() .GetService<IOptions<T>>() .Value; } public static string GetSection(string key) { return Configuration.GetValue<string>(key); } }
标签:webapi,GetSection,读取,配置文件,logger,configuration,public,string 来源: https://www.cnblogs.com/kingsmart/p/14985113.html