在netcore开发中，最常见的就是注入，比如想获取appsettings.json的内容，我们就需要去注入，然后在controller里面去获取，但是我们如果想要在service中使用appsettings.json的内容，这样就是一个问题，并且每个controller去注入也是非常麻烦的事情
下面的注入的（这种方法百度一下可以出来几百条相同的搜索结果。。。参见https://www.cnblogs.com/ideacore/p/6282926.html）
services.AddOptions(); services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));
然后获取使用
我想要在service类库里面使用，这时该如何使用哪？
直接上代码：
public class AppSettings { public string TestString { get; set; } public string ConfigVersion { get; set; } public string connectionString { get; set; } public string RedisExchangeHosts { get; set; } public string UploadPath { get; set; } }
public Startup(IConfiguration configuration, ILoggerFactory factory, IHostingEnvironment env) { EnvironmentName = env.EnvironmentName; Configuration = configuration; // 将内置的日志组件设置为 NHibernate 的日志组件 var builder = new ConfigurationBuilder() .SetBasePath(env.ContentRootPath) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true) .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)//增加环境配置文件，新建项目默认有 .AddEnvironmentVariables(); new AppSettingProvider().Initial(configuration); Configuration = builder.Build(); }
public class AppSettingProvider { private static AppSettings _myappSettings; public static AppSettings _appSettings { get { return _myappSettings; } } public void Initial(IConfiguration configuration) { _myappSettings = new AppSettings() { ConfigVersion = configuration["AppSettings:ConfigVersion"], connectionString = configuration["AppSettings:connectionString"], TestString = configuration["AppSettings:TestString"], RedisExchangeHosts = configuration["AppSettings:RedisExchangeHosts"], UploadPath = configuration["AppSettings:UploadPath"] }; } }
这样，我们在要使用的时候只需要AppSettingProvider._appSettings.xxxx即可，不需要进行重复的、实现
有错误或者片面地方欢迎指正
原文：https://www.cnblogs.com/wangpengzong/p/12700974.html