How to set properties of same name but different types in inherited classes

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I may have asked the question wrongly but stick with me here.

I am making a configuration manager that has a couple of rules.. all Keys are string, but Value can be either string, int, double or bool (but shown as 0,1 integers)

I've wrote a class and some generic stuff and also overrode ToString(); method to get a nice printing pattern AND on the wrapper class I've created an operator override to get the object. Now I'm trying to create a setter for that object but I'm having some serious troubles since the type of the value doesn't match..

public class Config()
{
    public List<ConfigEntry> ConfigLines {get;set;}

    public ConfigEntry this[string key]
    {
        get
        {
            if(CfgConfig.Any(x => x.GetKey(true) == key))
            {
                return CfgConfig.Where(x => x.GetKey(true) == key).Single();
            }
            if (ProfileConfig.Any(x => x.GetKey(true) == key))
            {
                return ProfileConfig.Where(x => x.GetKey(true) == key).Single();
            }

            return null;
        }
        set
        {
            //??????????????
        }
    }

    public class ConfigEntry()
    {
        public string CommonStuff {get;set);

        public virtual string GetKey(bool tolower = false)
        {
            return null;
        }

        public override string ToString()
        {
            return CommonStuff;
        }


    public class IntValue : ConfigEntry
    {
        public string Key {get;set;}
        public int Value {get;set;}

        public override string ToString()
        {
            return $@"{Key}={Value};";
        }

        public virtual string GetKey(bool tolower = false)
        {
            if (tolower)
                return Key.ToLower();
            else
                return Key;
        }
    }
}

Now how could I configure that setter of the operator [] for this to actually work as normal, that if I type, lets say ConfigLines["anintkey"] = 5; and ConfigLines["astringkey"] = "Hello"; that both things work.. I suppose that I do need to use the <T> class here somewhere, but I haven't used templates that much and I can't figure out a way to pull this off. I do want to keep the original list as a base class and then work from that, but I have no clue how to pull this one off.

Thank you all for the help!

asked 37 secs ago

DethoRhyne

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How to set properties of same name but different types in inherited classes