Learning to use Interfaces effectively

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Description

Interfaces in C # provide a way to achieve runtime polymorphism. Using interfaces we can invoke functions from different classes through the same Interface reference, whereas using virtual functions we can invoke functions from different classes in the same inheritance hierarchy through the same reference.

For example:

public class FileLog : ILog
{
    public void Log(string text)
    {
        // write text to a file
    }
}

public class DatabaseLog : ILog
{
    public void Log(string text)
    {
        // write text to the database
    }
}

public interface ILog
{
    void Log(string text);
}

public class SomeOtherClass
{
    private ILog _logger;

    public SomeOtherClass(ILog logger)
    {
        // I don't know if logger is the FileLog or DatabaseLog
        // but I don't need to know either as long as its implementing ILog
        this._logger = logger;
        logger.Log("Hello World!");
    }    
}

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