ASP .NET CORE 读取配置文件的方法

老式的config文件在ASP。net core2.0中变成了appsettings.json，如果想要读取自定义配置，可以写如下代码

{
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Warning"
    }
  },
"Wizards": [
    {
"Name": "Gandalf",
"Age": "1000"
    },
    {
"Name": "Harry",
"Age": "17"
    }
  ],
"Sex": {
"Man": 0,
"Female": 1
  }
}

读取的时候，比如读取Man的值，可以这么写：

            var builder = new ConfigurationBuilder()
           .SetBasePath(Directory.GetCurrentDirectory())
           .AddJsonFile("appsettings.json");
var config = builder.Build();
var ret = config.GetSection("Sex:Man").Value;

其他更多配置，例如数据库等请参考：

https://docs.microsoft.com/zh-cn/aspnet/core/tutorials/first-mvc-app/working-with-sql?tabs=aspnetcore2x
和
https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/configuration/index?tabs=basicconfiguration