Passing ref-types by ref : Class as Parameter « Class « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Class
3. Class as Parameter

using System;

class Person
{
  public string fullName;
  public int age;

  public Person(string n, int a)
  {
    fullName = n;
    age = a;
  }

  public void PrintInfo()
  {
    Console.WriteLine("{0} is {1} years old", fullName, age);
  }
}

class MainClass
{
  public static void SendAPersonByReference(ref Person p)
  {
    p.age = 555;

    p = new Person("TOM", 999);
  }


  public static void Main() 
  {
    Person mel = new Person("Mel", 23);
    mel.PrintInfo();
    SendAPersonByReference(ref mel);
    mel.PrintInfo();
  }
}

Mel is 23 years old
TOM is 999 years old