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ASP.NET Core 注入和获取 AppSettings 配置

ASP.NET Core 项目中有个appsettings.json配置文件,用于存放一些配置信息,比如数据库连接字符串等,但访问的话,只能在 ASP.NET Core 项目中获取,如果我们在其他项目类库中,该怎样获取呢?

实现方式就是利用 ASP.NET Core DI,将配置信息注入到 IoC 中,通过构造函数获取注入的对象。

appsettings.json示例代码:

{
  "AppSettings": {
    "AccessKey": "111111",
    "SecretKey": "22222",
    "Bucket": "3333333",
    "Domain": "http://wwww.domain.com"
  },
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Error",
      "System": "Information",
      "Microsoft": "Information"
    }
  }
}

对应AppSettings对象代码:

public class AppSettings
{
    public string AccessKey { get; set; }

    public string SecretKey { get; set; }

    public string Bucket { get; set; }

    public string Domain { get; set; }
}

ConfigureServices添加配置代码:

public void ConfigureServices(IServiceCollection services)
{
    var appSettings = Configuration.GetSection("AppSettings");
    services.Configure<AppSettings>(appSettings);
    services.AddTransient<IUpoladService, UpoladService>();

    // Add framework services.
    services.AddMvc();
}

UpoladService通过构造函数方式获取注入对象:

public class UpoladService : IUpoladService
{
    private AppSettings _appSettings;

    public UpoladService(IOptionsMonitor<AppSettings> appSettings)
    {
        _appSettings = appSettings.CurrentValue; //IOptions 需要每次重新启动项目加载配置,IOptionsMonitor 每次更改配置都会重新加载,不需要重新启动项目。
    }
}

参考资料:

posted @ 2017-04-27 19:47  田园里的蟋蟀  阅读(7010)  评论(7编辑  收藏  举报