pereirazc / Configuration.Expander

An extension to enable variable expansion in .NET config files

Configuration.Expander Extension

An extension to enable configuration variable expansion. It depends on Microsoft.Extensions.Configuration and Microsoft.Extensions.Configuration.Binder.

Usage

In any declaration you can use a variable expansion like ${ <VARIABLE_NAME> }. The <VARIABLE_NAME> will be expandaded (replaced) by any value which key is defined in the Configuration object. A fallback value can be provided for the abscense of a variable/configuration ${ <VARIABLE_NAME> ?? <DEFAULT_VALUE> }

Declaration

{
    "db": {
        "host": "${ DB_HOST ?? localhost }"
    }
}

Usage in code

configuration.ResolveValue<String>("db:host")