How do I call a derived class method from the base class?

佐手、 提交于 2019-12-01 02:22:01
omer schleifer

The correct way is to add a method DoSomeMagic() in the base class, with default implementation, or abstract. The derived class should than override it to do its magic.

Something like this maybe:

public class WireLessDevice
{ // base class
    protected virtual void ParseMessage()
    {
        // Do common stuff in here
    }
}

public class WiFi : WireLessDevice
{ // derived class
    override void ParseMessage()
    {
        base.ParseMessage();//Call this if you need some operations from base impl.
        DoGPSStuff();
    }
    private void DoGPSStuff()
    {
        //some gps stuff
    }
    GPSLoc Loc;
}
Thorarin

Virtual methods would be a good solution. You create a method ParseMessage in the base class which handles all the stuff common to each derived type, then override for specific devices.

In order to still be able to handle other message types, you will need to call the base.ParseMessage as appropriate:

class WireLessDevice
{
    protected virtual bool ParseMessage(byte[] message)
    {
        // Inspect message and handle the known ones
        return true; // Only if message parsed, otherwise false
    }
}

class WiFi : WireLessDevice
{
    GPSLoc Loc;

    protected override bool ParseMessage(byte[] message)      
    {
        bool messageParsed = base.ParseMessage(message)
        if (!messageParsed)
        {
            // Handle device specific message with GPSLoc
            Loc = ...
        }
        else
        {
            return false;
        }
    }
}

If your base class is not handling any other messages, the code could be simpler (and using abstract). However, in that case I would consider moving the web socket code to the derived class.

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