NetCore 控制台读取配置文件

依赖：

Microsoft.Extensions.Configuration

Microsoft.Extensions.Configuration.Binder

Microsoft.Extensions.Configuration.EnvironmentVariables

Microsoft.Extensions.Configuration.FileExtensions

Microsoft.Extensions.Configuration.Json

读取代码

 var builder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .AddEnvironmentVariables();

            IConfigurationRoot configuration = builder.Build();

            ConnectionStrings connectionStrings = new ConnectionStrings();
            configuration.GetSection("ConnectionStrings").Bind(connectionStrings);

appsettings.json

{
  "ConnectionStrings": {
    "SqlServer": "",
    "TiDB": ""
  }
}