.netcore webapi 在startup中读取配置字符串

参考微软官方说明：https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration

具体为：

读取方法见下图中标红的格式，数字代表顺序，分号代表级别

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Console.WriteLine($"option1 = {Configuration["option1"]}");       Console.WriteLine($"option2 = {Configuration["option2"]}");       Console.WriteLine(           $"suboption1 = {Configuration["subsection:suboption1"]}");       Console.WriteLine();         Console.WriteLine("Wizards:");       Console.Write($"{Configuration["wizards:0:Name"]}, ");       Console.WriteLine($"age {Configuration["wizards:0:Age"]}");       Console.Write($"{Configuration["wizards:1:Name"]}, ");       Console.WriteLine($"age {Configuration["wizards:1:Age"]}");

对应的appsetting文件：

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{   "option1": "value1_from_json",   "option2": 2,     "subsection": {     "suboption1": "subvalue1_from_json"   },   "wizards": [     {       "Name": "Gandalf",       "Age": "1000"     },     {       "Name": "Harry",       "Age": "17"     }   ] }