如何在 .net Core 应用程序中使用 IConfiguration 绑定多级配置对象? [英] How do I bind a multi level configuration object using IConfiguration in a .net Core application?

问题描述

我正在尝试绑定到应由 appsettings.json 文件填充的自定义配置对象.

I'm trying to bind to a custom configuration object which should be populated by an appsettings.json file.

我的应用设置看起来有点像:

My appsettings looks a bit like:

{
  "Logging": {
    "IncludeScopes": true,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "Settings": {
    "Foo": {
      "Interval": 30,
      "Count": 10
    }
  }
}

设置类如下所示:

public class Settings
{
  public Foo myFoo {get;set;}
}

public class Foo
{
  public int Interval {get;set;}
  public int Count {get;set;}

  public Foo()
  {}

  // This is used for unit testing. Should be irrelevant to this question, but included here for completeness' sake.
  public Foo(int interval, int count)
  {
    this.Interval = interval;
    this.Count = count;
  }
}

当我尝试将配置绑定到最低级别的对象时，它起作用了:

When I try to bind the Configuration to an object the lowest level it works:

Foo myFoo = Configuration.GetSection("Settings:Foo").Get<Foo>();

myFoo 正确地有一个 Interval 和一个 Count，其值分别设置为 30 和 10.

myFoo correctly has an Interval and a Count with values set to 30 and 10 respectively.

但这不会:

Settings mySettings = Configuration.GetSection("Settings").Get<Settings>();

mySettings 有一个空 foo.

令人沮丧的是，如果我使用调试器，我可以看到正在从 appsettings.json 文件中读取必要的数据.我可以进入 Configuration =>非公共成员 =>_providers =>[0] =>数据 并查看我需要的所有信息.它只是不会绑定一个复杂的对象.

Frustratingly, if I use the debugger I can see that the necessary data is being read in from the appsettings.json file. I can step down into Configuration => Non-Public Members => _providers => [0] => Data and see all of the information I need. It just won't bind for a complex object.

推荐答案

您的属性必须与appsettings.json"中的属性名称匹配.

Your property must match the property names in "appsettings.json".

您必须将 Settings 的 myFoo 属性重命名为 Foo，因为这是 json 文件中的属性名称.

You must rename your Settings' myFoo property into Foo, because that's property name in the json file.

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