An example of aggregating multiple interfaces to allow registration with interface segregation

Interfaces.cs

public interface IAppSettings
{
    string ApplicationName { get;  }        
}

public interface ISqlConnectionSettings 
{        
    string SqlConnectionSting { get; }
}

public interface IOracleConnectionSettings
{        
    string OracleConnectionSting { get; }
}

public interface IAppSettingsResolved : IAppSettings, ISqlConnectionSettings, IOracleConnectionSettings
{        
}