/// <summary>
/// Builds a flat dictionary of the key/value pairs represented by the given <see cref="IConfigurationProvider"/> instance.
/// </summary>
/// <param name="provider">The <see cref="IConfigurationProvider"/> instance from which to construct the dictionary.</param>
/// <returns>A flat dictionary of the key/value pairs in the given <see cref="IConfigurationProvider"/> instance.</returns>
internal static IDictionary <string, string> ToDictionary(this IConfigurationProvider provider)
{
if (provider == null)
{
throw new ArgumentNullException(nameof(provider));
}
using (var config = new ConfigurationRoot(new[] { provider }))
return(config.ToDictionary());
}