Question

How to create sealed method to prevent override the virtual method from it in C#

Answer 1

using System;

class X {
    protected virtual void M() { Console.WriteLine("class X - M()"); }
    protected virtual void M2() { Console.WriteLine("class X - M2()"); }
}

class Y : X {
    sealed protected override void M() { Console.WriteLine("class Y : X - M()"); }
    protected override void M2() { Console.WriteLine("class Y : X - M2()"); }
}

class Z : Y {
    // protected override void M() { Console.WriteLine("Zclass Z : Y - M()"); } //  error CS0239: `Z.M()': cannot override inherited member `Y.M()' because it is sealed

    protected override void M2() { Console.WriteLine("class Z : Y - M2()"); }
}

class Program 
{
    static void Main()
    {
        var z = new Z();

        // Console.WriteLine(z.M2()); // error CS1540: Cannot access protected member `X.M2()' via a qualifier of type `Z'. The qualifier must be of type `Program' or derived from it
    }
}



/*
run



*/

 

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