public void Main(string[] args)
{
var builder = new ConfigurationBuilder(".");
builder.AddJsonFile("appsettings.json");
builder.AddEnvironmentVariables();
var config = builder.Build();
builder.AddEntityFramework(options => options.UseSqlServer(config["Data:DefaultConnection:ConnectionString"]));
config = builder.Build();
Console.WriteLine("key1={0}", config.Get("key1"));
Console.WriteLine("key2={0}", config.Get("key2"));
Console.WriteLine("key3={0}", config.Get("key3"));
}
