如何从另一个项目访问应用程序设置 [英] How to access appsettings from another project

问题描述

在启动文件中，我需要一种访问另一个项目中的IConfiguration的方法.有人告诉我，业务逻辑不应该了解IConfiguration.如果是这种情况，那么我该如何将数据从设置中注入到业务逻辑项目中.

In the startup file I need a way to access IConfiguration in another project. I have been told the Business Logic should not know about IConfiguration. If thats the case then how do I inject data from appsettings down to the business logic projects.

appsettings.json

{
  "AdminEmail": "[e-mail]"
}

如何在同一解决方案中创建的类库中访问AdminEmail?

How would I access AdminEmail in a class library I created in the same solution?

推荐答案

• 定义设置模型

  • Define a model for settings

    public sealed class EmailSettings
    {
        public string AdminEmail { get; set; }
    }
    

  • 配置设置

  • Configure settings

    public sealed class Startup
    {
        private readonly IConfiguration configuration;
    
        public Startup(IConfiguration configuration) => this.configuration = configuration;
    
        public void ConfigureServices(IServiceCollection services)
        {
            services
                .Configure<EmailSettings>(configuration)
                .AddSingleton(sp => sp.GetRequiredService<IOptions<EmailSettings>>().Value);
        }
    }
    

  • 注入并使用

  • Inject and use it

    public class ClassLibraryInTheSameSolution
    {
        public ClassLibraryInTheSameSolution(EmailSettings emailSettings)
        {                         
        }
    }
    

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