.NET Core 如何在其它类库读取 appsettings.json 或者其它配置文件？

Question

.NET Core 如何在其它类库读取 appsettings.json 或者其它配置文件？

感谢各位提点。

Answer 1

1.在其他类的构造函数进行构造

public RedisClient(IConfiguration configuration)
    {
        _connectionString = configuration.GetSection("redis")["ConnectionString"];
    }
}

{
  "redis": {
    "ConnectionString": "xxx"
  }
}

appsettings.json的配置如上

Answer 2

你好,

下面的文章提供了3步 来访问appsettings.json 里面的内容。

#Json

{
  "ServiceSettings": {
    "NewsMainUrl": "https://newsapi.org",
    "NewsApiKey": "abc"
  },

  "BALSettings": {
    "Source": "xyz",
    "FilterTerms": "abc;def;"
  }
}

1.  建一个model class 来映射appsettings.json里面的字段

namespace Tweet.Entities
{
    public class BALSettings
    {
        public string Source { get; set; }
        public string FilterTerms { get; set; }
    }

   public class ServiceSettings
    {
        public string NewsMainUrl { get; set; }
        public string NewsApiKey { get; set; }
    }

}

2. 通过DI容器注册 appsettings.json 到相关的 model classes 里面。

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
   services.Configure<BALSettings>(Configuration.GetSection("BALSettings"));
   services.Configure<ServiceSettings>(Configuration.GetSection("ServiceSettings"));
}

3. 在类库项目中访问 appsettings.json section.

注意: Microsoft.Extensions.Options 要通过Nuget 来安装。

PM> Install-Package Microsoft.Extensions.Options 

using Microsoft.Extensions.Options;

public class NewsService : INewsService
    {
        private readonly IOptions<ServiceSettings> _serviceSettings;

        public NewsService(IOptions<ServiceSettings> serviceSettings)
        {
            _serviceSettings = serviceSettings;
        }

        public string composeUrl()
        {
            return _serviceSettings.Value.NewsMainUrl + "&apiKey=" + _serviceSettings.Value.NewsApiKey;
        }
    }

https://hassantariqblog.wordpress.com/2017/02/20/asp-net-core-step-by-step-guide-to-access-appsettings-json-in-web-project-and-class-library/

Best regards,

Zhanglong

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Answer 3

感谢回复！