Question

我正在尝试从 appsettings.json 中读取数据。

emailConfig中的

ApiController始终为空。我尝试使用Options pattern读取数据，但是它不起作用。

控制器

private EmailConfiguration emailConfig;

public ApiController (IOptions<EmailConfiguration> _emailConfig) {

    this.emailConfig=_emailConfig.Value;

}

appsettings.json

 {
  "ConnectionStrings": {
    "DefaultConnection": "connectionstring here"
  },



  "EmailConfiguration": {
    "SmtpServer": "smtp.zoho.com",
    "SmtpPort": 587,
    "SmtpUsername": "username.zoho.com",
    "SmtpPassword": "password"
  },
    "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  }
}

将appsettings.json加载到配置文件（Startup.cs）

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

Startup.cs // // ConfigureServices（）

services.Configure<EmailConfiguration>(Configuration);

services.AddSingleton<IEmailConfiguration> (Configuration.GetSection ("EmailConfiguration").Get<EmailConfiguration> ());
services.AddSingleton<IEmailConfiguration> (sp =>
        sp.GetRequiredService<IOptions<EmailConfiguration>> ().Value
      );

EmailConfiguration.cs

public class EmailConfiguration : IEmailConfiguration {

    public EmailConfiguration(){

    }

    public string SmtpServer { get; set; }
    public int SmtpPort { get; set; }
    public string SmtpUsername { get; set; }
    public string SmtpPassword { get; set; }

}

Answer 1

调用Configure时，您需要指定该部分以绑定设置文件的所需部分

services.Configure<EmailConfiguration>(Configuration.GetSection("EmailConfiguration"));

由于您现在已经注册了该选项，并且您似乎还想将其注册为单例，请考虑以下内容

services.AddSingleton<IEmailConfiguration> (sp => 
    sp.GetRequiredService<IOptions<EmailConfiguration>>().Value
);

无法从appsettings.json中读取数据

1 个答案: