C# override instance method

Question

So basically I have an object that takes instances and adds them to a list. Each instance uses virtual methods, which I need to override once the instance is created. How would I go about overriding methods of an instance?

Answer 1

You can't. You can only override a method when defining a class.

The best option is instead to use an appropriate Func delegate as a placeholder and allow the caller to supply the implementation that way:

public class SomeClass
{
    public Func<string> Method { get; set; }

    public void PrintSomething()
    {
        if(Method != null) Console.WriteLine(Method());
    }
}

// Elsewhere in your application

var instance = new SomeClass();
instance.Method = () => "Hello World!";
instance.PrintSomething(); // Prints "Hello World!"