Read Connection String into configuration without Entity Framewiork DbContext - asp.net-core

Question

I'm developing a .NET Core 2.1 application that does not use Entity Framework. But I'm wondering how to read the connection string into the Configuration because the usual method expects a DBContext file (which I do not have because I am note using EF).
If I were using EF, I would normally read the connection string from appsettings.json like this:
services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
How do I do it without the DBContext?

Answer 1

If you're using simple ado.net, you can't use DBContext. You open a connection and execute your query instead:
NOTE using statement is important here to ensure the connection is disposed/closed properly.
using (SqlConnection connection =
new SqlConnection(Configuration.GetConnectionString("DefaultConnection")))
{
// Create the Command and Parameter objects.
SqlCommand command = new SqlCommand(queryString, connection);
command.Parameters.AddWithValue("#pricePoint", paramValue);
// Open the connection in a try/catch block.
// Create and execute the DataReader, writing the result
// set to the console window.
try
{
connection.Open();
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Console.WriteLine("\t{0}\t{1}\t{2}",
reader[0], reader[1], reader[2]);
}
reader.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.ReadLine();
}