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：

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "AppSettings": {
    "TestString": "This is default environment",
    "ConfigVersion": "local",
    "connectionString": "connectionString",
    "RedisExchangeHosts": "RedisExchangeHosts"
  }
}

 

    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();

        </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> AppSettingProvider().Initial(configuration);

        Configuration </span>=<span style="color: #000000;"> builder.Build();

    }</span></pre>

    public class AppSettingProvider
    {
        private static AppSettings _myappSettings;
        public static AppSettings _appSettings { get { return _myappSettings; } }

    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> Initial(IConfiguration configuration)
    {
        _myappSettings </span>=  <span style="color: #0000ff;">new</span><span style="color: #000000;"> AppSettings() {
            ConfigVersion </span>= configuration[<span style="color: #800000;">"</span><span style="color: #800000;">AppSettings:ConfigVersion</span><span style="color: #800000;">"</span><span style="color: #000000;">],
            connectionString </span>= configuration[<span style="color: #800000;">"</span><span style="color: #800000;">AppSettings:connectionString</span><span style="color: #800000;">"</span><span style="color: #000000;">],
            TestString </span>= configuration[<span style="color: #800000;">"</span><span style="color: #800000;">AppSettings:TestString</span><span style="color: #800000;">"</span><span style="color: #000000;">],
            RedisExchangeHosts </span>= configuration[<span style="color: #800000;">"</span><span style="color: #800000;">AppSettings:RedisExchangeHosts</span><span style="color: #800000;">"</span><span style="color: #000000;">],
            UploadPath </span>= configuration[<span style="color: #800000;">"</span><span style="color: #800000;">AppSettings:UploadPath</span><span style="color: #800000;">"</span><span style="color: #000000;">]
        };
    }

}</span></pre>

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