引用 Microsoft.AspNetCore.App 元包或将包引用添加到 Microsoft.Extensions.Options.ConfigurationExtensions 包。

简而言之，直接可以用：

Appsetting.json
{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "Setting": {
    "Url": "http://localhost:8080/",
    "LogPath": "D/ItemService"   
  },
  "AllowedHosts": "*"  
}


configuration["Setting:Url"]
configuration.GetValue<string>("Setting:Url")
configuration GetSection("Setting"). GetSection("Url")

 

方法二：

新建model类Settings

{
 Public string A{get;set;}
};

其中A对应与json中配置文件的key，这里类是

{
 Public string Url{get;set;}
 Public string LogPath{get;set;}
};

在Startup.cs中ConfigureServices的方法

services.Configure<Settings>(options =>
            {
                options.ConnectionString = configuration.GetSection("Setting:Url").Value;
                options.Database = configuration.GetSection("Setting:LogPath").Value;
            });

 

使用：这样可以在全局拿到配置文件

 public BController(IOptions<Settings> settings)
        {
            url=settings.Value.Url;
            logpath = settings.Value.LogPath);
        }