How to force overriding a method in a descendant, without having an abstract base class?

Question

Question Heading seems to be little confusing, But I will Try to clear my question here.

using System;
using System.Collections.Generic;
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Answer 1

This is pretty old, but we have a somewhat similar situation. The base class loads a configuration file and sets up base class defaults. However, the configuration file could also contain default values for inherited classes.

This is how we got the combined functionality.

Base class methods

private void processConfigurationFile()
{
    // Load and process the configuration file
    // which happens to be an xml file.
    var xmlDoc = new XmlDocument();
    xmlDoc.Load(configurationPath);

    // This method is abstract which will force
    // the inherited class to override it.
    processConfigurationFile(xmlDoc);
}

protected abstract void processConfigurationFile(XmlDocument document);