ASP.NET Core Expose Config到DI注入服务 [英] ASP.NET Core Expose Config to DI Injected Service

问题描述

我有一个ASP.NET Core WebAPI项目，并且试图将配置添加到我通过注入的 IEmailService 中，如下所示:

I have a ASP.NET Core WebAPI project and I am trying to add configuration to my IEmailServicethat I am injecting through DI like this:

services.AddTransient<IEmailSender, AuthMessageSender>();

AuthMessageSender 的实例如何进入配置文件中的设置?

How can instances of AuthMessageSender get to settings in the config file?

推荐答案

您应使用

创建您的 EmailSettings 强类型配置类:

1. Create your EmailSettings strongly typed configuration class:

public class EmailSettings  
{
    public string HostName { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
}

1. 更新您的 appsettings.json ，以包含一个映射到您的 EmailSettings 配置类的配置部分:

1. Update your appsettings.json to include a configuration section that maps to your EmailSettings configuration class:

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "EmailSettings": {
    "HostName": "myhost.com",
    "Username": "me",
    "Password": "mysupersecretpassword",
  }
}

1. 在 Startup 类的 ConfigureServices 调用中，将 appsettings.json 绑定到您的配置类

1. In the ConfigureServices call of your Startup class, bind appsettings.json to your config class

public void ConfigureServices(IServiceCollection services)  
{
    services.Configure<MySettings>(
          options => Configuration.GetSection("EmailSettings").Bind(options));
}

1. 在您的 AuthMessageSender 类中，将 IOptions< EmailSettings> 的实例注入构造函数

1. In your AuthMessageSender class, inject an instance of IOptions<EmailSettings> into the constructor

public class AuthMessageSender
{
    private readonly EmailSettings _settings;
    public AuthMessageSender(IOptions<EmailSettings> emailSettings)
    {
       _settings = emailSettings.Value;
      // _settings.HostName == "myhost.com";
    }
}

---

请注意，在第3步中，您还可以使用

---

Note that in step 3, you can also use

public void ConfigureServices(IServiceCollection services)  
{
    services.Configure<MySettings>(Configuration.GetSection("EmailSettings"));
}

如果在 project.json 中添加对 Microsoft.Extensions.Options.ConfigurationExtensions 的引用:

If you add a reference to Microsoft.Extensions.Options.ConfigurationExtensions in project.json:

{
  "dependencies": {
     "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0"
  }
}

这篇关于ASP.NET Core Expose Config到DI注入服务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！