NETCore 读取AppSetting配置文件参数
AppSetting.json
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{ "Logging": { "LogLevel": { "Default": "Information", "Microsoft": "Warning", "Microsoft.Hosting.Lifetime": "Information" } }, "AllowedHosts": "*", "Title": "Hello World!", "Message": "Hello World - AppSetting - 啊!", "ConnectionStrings": { "Mysql": "server=localhost;port=3306;userid=root;pwd=123456;database=testefdb", "MsSql": "Data Source=.;Initial Catalog=testefdb;User Id=root;Password=123456;" } }
jsconfig.json
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{ "Name": "Joker", "Sex": "Man", "Describe": "描述", "Message": "Hello World - JsConfig - 啊!" }
构造函数注入参数
public Microsoft.Extensions.Configuration.IConfiguration Configuration { get; } public Startup(IConfiguration configuration) { Configuration = configuration; }
获取配置文件参数
1.获取指定key的值
var title = Configuration["Title"]; var mysql = Configuration["ConnectionStrings:Mysql"];
2.绑定配置模型对象
// 获取所有配置 var appSetting = new MyAppSetting(); Configuration.Bind(appSetting); var loggerDefault = appSetting.Logging.LogLevel.Default; // 获取指定节点配置 var connectionstrings = new Connectionstrings(); Configuration.GetSection("ConnectionStrings").Bind(connectionstrings); var mssql = connectionstrings.MsSql;
3.注册配置选项的服务
3.1.在 Startup/ConfigureServices 注册配置选项服务
// 注册配置选项服务: Microsoft.Extensions.Hosting services.Configure<MyAppSetting>(Configuration); // 注册 自定义配置信息 var config = new ConfigurationBuilder().AddJsonFile("jsconfig.json", true, true).Build(); var name = config["Name"]; services.Configure<MyJsConfig>(config);
3.2.在 Startup/Configure 获取配置
public void Configure(IOptions<MyAppSetting> appSettingOptions, IOptionsSnapshot<MyJsConfig> myJsConfigoptions) { // 读取 配置信息【appsettings.json】 var loggerMicrosoft = appSettingOptions.Value.Logging.LogLevel.Microsoft; // 读取 自定义配置信息【jsconfig.json】 var describe = myJsConfigoptions.Value.Describe; }
*注:
1.在 Startup/ConfigureServices 通过 AddJsonFile 注册自定义配置信息,使用IOptionsSnapshot【站点启动后,每次获取到的值都是配置文件里的最新值】没有效果,需要在 Program/CreateHostBuilder 中进行配置【有知道的大佬求解释】
public static IHostBuilder CreateHostBuilder(string[] args) { // 创建默认Builder,完成各种基础配置: Host.CreateDefaultBuilder 已注册 appsetting.json IHostBuilder hostBuild = Host.CreateDefaultBuilder(args); // 配置默认WebHost hostBuild.ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); }); hostBuild.ConfigureAppConfiguration(configBuilder => { // 注册 自定义配置信息,reloadOnChange:如果文件更改,是否应重新加载配置(Microsoft.Extensions.Configuration.Json) configBuilder.AddJsonFile("jsconfig.json", true, reloadOnChange: true); }); return hostBuild; }
2.appsetting.json 和 jsconfig.json 两个配置文件会同时生效,同名的值后者优先【jsconfig.json】
3.早期Core版本获取动态配置需要手动指定 reloadOnchange = true,目前3.1已默认配置,只需要使用 Microsoft.Extensions.Options.IOptionsSnapshot 就可以