Why is method with object parameter called instead of int parameter

Asked Sep 28 '18 at 06:19

Active Sep 28 '18 at 06:22

Viewed 128 times

I don't understand this weird behavior. I have an overridden method that accepts int and a method that accepts an object type in derived class. If I pass an int, the method with object type is called.

using System;
public class Program
{
   static void Main(string[] args)
   {
      Derived d = new Derived();
      int i = 10;
      d.Func(i);
      Console.ReadKey();
  }
}
public class Base
{
  public virtual void Func(int x)
  {
      Console.WriteLine("Base.Func(int)");
  }
}
public class Derived : Base
{
  public override void Func(int x)
  {
      Console.WriteLine("Derived.Func(int)");
  }
  public void Func(object o)
  {
      Console.WriteLine("Derived.Func(object)");
  }
}

Why isn't the method that accepts int called?

https://www.ideone.com/OToXWS vs https://www.ideone.com/BIugxO

edited Sep 28 '18 at 06:22

Ryan Leach

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asked Sep 28 '18 at 06:19

nan

Have you had previous experience programming in Java? – Ryan Leach Sep 28 '18 at 06:21
No. I have never used Java. – nan Sep 28 '18 at 06:21
4

Your exact question can be answered by [this article](http://csharpindepth.com/Articles/General/Overloading.aspx), looking to find a duplicate SO quetstion with it – Scott Chamberlain Sep 28 '18 at 06:25
As per that article compiler ignores your overridden method and calls Func with object. – Just code Sep 28 '18 at 06:30
2

This is a design decision, the purpose of which is to remove *some* problems, but it will introduce other problems, so it's a tradeoff. You will have to learn to live with it since I believe this is documented (though I'm not able to find that documentation right now). – Lasse V. Karlsen Sep 28 '18 at 06:32
@LasseVågsætherKarlsen C# specification 5.0, section 7.5.3 (It is in the linked duplicate) – Scott Chamberlain Sep 28 '18 at 06:37
@ScottChamberlain Yup, I read that section and skipped the whole paragraph in search for something I seemed to remember, good find! – Lasse V. Karlsen Sep 28 '18 at 06:43

Why is method with object parameter called instead of int parameter

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