在 ASP.Net Core 应用程序上调试期间未注入 appSetting.Development.json

Question

我的中有以下内容appSetting.json；

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "MailServiceSettings": {
    "SmtpServer": "<server>",
    "ToAddresses": [
      "email@domain.com",
      "email2@domain.com"
    ],
    "UserName": "username",
    "Password": "password"
  }
}

而appSettings.Development.json我也有了微妙的变化；

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "MailServiceSettings": {
    "SmtpServer": "<server>",
    "ToAddresses": [
      "development@domain.com"
    ],
    "UserName": "username",
    "Password": "password"
  }
}

这样我就可以在本地主机中发送邮件发件人设置文本，而无需轰炸实时邮箱。

但是，当我在调试中运行时，设置appSettings.json将被注入而不是appSettings.Development.json.

我的Program.cs是使用默认的WebHostBuilder；

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args)
            .Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
}

并在 my 中按以下方式设置 DI StartUp.cs；

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        services.Configure<MailServiceSettings>(Configuration.GetSection("MailServiceSettings"));

        // In production, the Angular files will be served from this directory
        services.AddSpaStaticFiles(configuration =>
        {
            configuration.RootPath = "ClientApp/dist";
        });
    }

然后，当我调试并中断配置时，我可以看到appSettings.Development.json已读取这些文件（因为我可以在调试时深入了解这些Configuration部分，我可以看到它们被添加为附加条目，并且我相信默认情况下WebHost.CreateDefaultbuilder会添加文件）。env.EnvironmentName

然而，当我实例化一个控制器方法时；

public ContactController(IOptions<MailServiceSettings> mailSettings, IHostingEnvironment hostingEnvironment)
{
    _mailSettings = mailSettings;
    _hostingEnvironment = hostingEnvironment;
}

我发现注入的是 2x 电子邮件地址，appSettings.json而不是appSettings.Development.json

我还在env.IsDevelopment()运行时检查过，这正在返回true。

谁能告诉我我在这里做错了什么？

Answer 1

我在追踪官方来源时遇到了麻烦，但本质上问题是它基本上IConfiguration是一个字典，并且来自配置源的键和值被扁平化到其中。换句话说，最终，您实际得到的内容类似于以下伪代码：

["MailServiceSettings:ToAddresses[0]"] = "email@domain.com"
["MailServiceSettings:ToAddresses[1]"] = "email2@domain.com"

然后，当你的appsettings.Development.json配置进来时：

["MailServiceSettings:ToAddresses[0]"] = "development@domain.com"

换句话说，配置中仍然有两项。解决这个问题的唯一方法是仅在特定于环境的配置中进行此类设置。如果您完全删除它appsettings.json，然后执行以下操作：

应用程序设置.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "MailServiceSettings": {
    "SmtpServer": "<server>",
    "UserName": "username",
    "Password": "password"
  }
}

appsettings.Development.json

{
  "MailServiceSettings": {
    "ToAddresses": [
      "development@domain.com"
    ]
  }
}

appsettings.Production.json

{
  "MailServiceSettings": {
    "ToAddresses": [
      "email@domain.com",
      "email2@domain.com"
    ]
  }
}

然后，您将正确地仅在开发中拥有一个地址，在生产中拥有两个地址。