Question

所以我有一个.net Core Web Api项目和我的DBAccess类库作为一个单独的项目包含在我的解决方案中。

在appsettings.json中：

{
  "ConnectionStrings": {
    "DefaultConnection": "Password=L3tters&#s;Persist Security Info=True;User ID=Some_User;Initial Catalog=My_Cat;Data Source=Mt.Shasta"
  },
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  }
}

在startup.cs中我有这个：

public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();

        }
public IConfigurationRoot Configuration { get; }    

        public void ConfigureServices(IServiceCollection services)
        {

            services.AddMvc();

            services.Configure<IISOptions>(options =>
            {
            });

            services.AddSingleton<IConfiguration>(Configuration);    

        }    

          public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            app.UseDefaultFiles();
            app.UseStaticFiles();
            app.UseMvc();
        }

所以，在控制器中我可以做这样的事情：

private readonly string _connectionString;

        public FloorController(IConfiguration configuration)
        {
            _connectionString = configuration.GetConnectionString("DefaultConnection");
        }

_connectionString = configuration.GetConnectionString("DefaultConnection");

所有这些好东西都在SNC_GSS中：

但我需要从DBAccess获取设置... 我想创建对SNC_GSS的引用，但我不能，因为SNC_GSS已经引用了DBAccess，并且它创建了一个循环引用...

思想？

Answer 1

只需使用这样的东西（构造函数注入）：

public class MyClass
{
   private readonly IConfiguration configuration;
   public MyClass(IConfiguration configuration)
   {
      this.configuration = configuration;
      //
      configuration.GetConnectionString("DefaultConnection");
   }
}

Answer 2

你可以这样做：

public class AppConfigurationHelper
{
    public T GetAppSettings<T>(string key) where T : class, new()
    {
        IConfiguration config = new ConfigurationBuilder()
            .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })
            .Build();
        var appconfig = new ServiceCollection()
            .AddOptions()
            .Configure<T>(config.GetSection(key))
            .BuildServiceProvider()
            .GetService<IOptions<T>>()
            .Value;
        return appconfig;
    }
}

然后使用此命名空间方法，例如：

var _AppConfigurationService = new AppConfigurationHelper();
var s = _AppConfigurationService.GetAppSettings<AppSettingsModel>("AppSettings");

当然，您需要包含该项目。

文件appsettings.json是你需要配置键值。

从包含的类库中访问ASP.net Core appsettings.json？

2 个答案: