Getting an appsettings.json config value inside Program.cs with type safety

Question

At the moment I'm using the code below in Program.cs to read a value from the appsettings.json file.What concerns me is that if I rename the section or the property (TimeOutInSeconds) to something else the code will compile fine but there will be a runtime error:

var timeoutInSeconds = configuration.GetSection("FluentApiSettings").GetValue<int>("TimeOutInSeconds");

Is there anyway I can access the settings in a strongly typed way by casting to a FluentApiSettings class?

Answer 1

You can use ConfigurationBinder.Bind for this:

FluentApiSettings.cs:

public class FluentApiSettings
{
    public int TimeOutInSeconds { get; set; }
}

Program.cs:

var fluentApiSettings = new FluentApiSettings();
configuration.GetSection("FluentApiSettings").Bind(fluentApiSettings);

You can also make that a little simpler with ConfigurationBinder.Get, which creates the instance for you too:

Program.cs:

var fluentApiSettings = configuration.GetSection("FluentApiSettings")
    .Get<FluentApiSettings>();