CSHARP

.net using appsettings variables

var connectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString;
connectionString.Expand() // returns "server=db01.mycompany.com;uid=uid;pwd=pwd;Initial Catalog=master;"

.net using appsettings variables

<configuration>
    <appSettings>
        <add key="Domain" value="mycompany.com"/>
        <add key="ServerName" value="db01.{Domain}"/>
    </appSettings>
    <connectionStrings>
        <add name="Default" connectionString="server={ServerName};uid=uid;pwd=pwd;Initial Catalog=master;" provider="System.Data.SqlClient" />
    </connectionStrings>
</configuration>

.net 6 get appsettings value

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// AppSettingsController.cs
[Route("appsettings")]
public class AppSettingsController : Controller
{
    ...
 
    [Route("first-way")]
    public IActionResult FirstWay()
    {
        return Content(_configuration.GetValue<string>("RoundTheCodeSync:Title"), "text/plain");
    }
}