use Microsoft.Extensions.Configuration - this code existed to provide a backwards maintainable simulation for full framrwork usage

ConMan

Load configs from App/Web.config (AppSettings), Environment Variables and a dedicated named json file living in %APPDATA%\Development\Settings{ConfigName}.json

Usage

ConMan can be used eather from as a static set of apis living at ConMan.Settings.GetSetting(...) or can be configured in DI by instanciating a singleton of SettingsManager and passing it around.

Using Settings

Configure providers

Settings.Configure(s=>{
    //settings are resolved from providers in the order they are registerd
    s.AddDevelopmentSettings("YourSharedProviderName") //setttigns in here
     .AddEnvironmentVariables() // will beat env vars
     .AddFromConfig(); // app.config will be last
});

Reading Settings

var value = Settings.GetSetting("Setting.Path.Here");

Using SettingsManager

Configure providers

var manager = new SettingsManager();

//settings are resolved from providers in the order they are registerd
manager.AddDevelopmentSettings("YourSharedProviderName") //setttigns in here
    .AddEnvironmentVariables() // will beat env vars
    .AddFromConfig(); // app.config will be last

Reading Settings

// manager instance from previous step 
var value = manager.GetSetting("Setting.Path.Here");

Providers

Development Setting Provider

Development settings are stored in a JSON file in a well know location per developer outside of source control, this can be used to store secrets that must stay out of source control (passwords etcs).

This file can be located at %APPDATA%\Development\Settings\{ConfigName}.json with {ConfigName} replace with the value passed into .AddDevelopmentSettings(...).

The path of the setting is converted into reading values from a JSON object structure so Path.To.Variable would expect a JSON file with a minimal structure of :

{
    'Path' : {
        'To' : {
            'Variable' : 'value'
        }
    }
}

Environment Variables Provider

Settings are read out of the Environment Variables availible to the current process.

The path of the settings are converted into a normalized formate for Environment variables such that dots are replaces with underscores and the phrase is converted to uppercase. i.e. Path.To.Variable becomes PATH_TO_VARIABLE.

Config Provider

The config provider reads values fro the underlying .net ConfigurationManager.AppSettings[...], such that it will read from app.config and web.config appSettings.

The path the the settings into a formate more normally used in appSettings such that dots are replaces with colons. i.e. Path.To.Variable will read from app settings <add key="Path:To:Variable" value="value" />.