配置文件名:appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "WeChat": {
    "RedirectUri": "https://libAuth.cdut.edu.cn/connect/oauth2/redirect/",
    "CallBackHost": [
      "192.168.244.5",
      "libic.cdut.edu.cn",
      "mlib.cdut.cn"
    ]
  }
}

目标：读出WeChat:CallBackHost中的数据，判断当前数据是否包含在这个数组中。

第一步，在要使用数据的类中通过构造函数注入IConfiguration

 public class WeChatController : ControllerBase
 {
     private readonly IConfiguration configuration;
     public WeChatController(IConfiguration configuration)
     {
         this.configuration = configuration;
     }
}

第二步，在方法中使用它

[HttpGet]
[Route("/connect/oauth2/authorize/{redirect_uri}/{scope}/{state}")]
public IActionResult OAuth(string redirect_uri, string scope, string state = "")
{
    //检测合法的回调主机
    var uri = new Uri(HttpUtility.UrlDecode(redirect_uri));
    if (uri == null) return BadRequest();
    if (configuration
        .GetSection("WeChat:CallBackHost")
        .GetChildren()
        .Where(s => s.Value.ToUpper() == uri.Host.ToUpper())
        .FirstOrDefault()
        == null)
    {
        return BadRequest();
    };
	//其余逻辑计算......
}

重点内容：

configuration.GetSection("WeChat:CallBackHost")

.GetChildren()

LINQ查询

Where(s => s.Value.ToUpper() == uri.Host.ToUpper())
FirstOrDefault()