C#•3y ago

Cannot set readonly field in inherited constructor [Answered]

Title says it all really, I'm not really sure why given this is clearly a constructor.

public class StandardCard : Card {
    public StandardCard(Suite suite, Rank rank) {
        if (!StandardRanks.ranks.Contains(rank))
            throw new Exception();

        this.suite = suite;
        this.rank = rank;
    }
}

public class StandardCard : Card {
    public StandardCard(Suite suite, Rank rank) {
        if (!StandardRanks.ranks.Contains(rank))
            throw new Exception();

        this.suite = suite;
        this.rank = rank;
    }
}

7 Replies

Angius•3y ago

private means available only in that class protected would be available in that class and its descendants

LukeJOP•3y ago

Everything was public though.

Angius•3y ago

Ah, huh, could be because of the readonly then..? Easiest solution would be to just make it a get-only property instead

Unknown User•3y ago

Message Not Public

TheRanger•3y ago

u can call the base constructor with : base() if the base constructor sets a value to that readonly field instead of setting the field with the child constructor

nathanAjacobs•3y ago

Couldn't you also just use init on the property like this?

public class BaseClass
{
    public int Prop { init; get; }

    public BaseClass()
    {
        Prop = 1;
    }
}

public class ChildClass : BaseClass
{
    public ChildClass()
    {
        Prop = 1;
    }
}

public class BaseClass
{
    public int Prop { init; get; }

    public BaseClass()
    {
        Prop = 1;
    }
}

public class ChildClass : BaseClass
{
    public ChildClass()
    {
        Prop = 1;
    }
}

Accord•3y ago

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Cannot set readonly field in inherited constructor [Answered]