Unlike some languages, C# does not provide a copy constructor. If you create a new object and want to copy the values from an existing object, you have to write the appropriate method yourself.
Example
In this example, the Person class contains a constructor that takes as the argument another object of type Person. The contents of the fields in this object are then assigned to the fields in the new object.
C#
class Person
{
private string name;
private int age;
// Copy constructor.
public Person(Person previousPerson)
{
name = previousPerson.name;
age = previousPerson.age;
}
// Instance constructor.
public Person(string name, int age)
{
this.name = name;
this.age = age;
}
// Get accessor.
public string Details
{
get
{
return name + " is " + age.ToString();
}
}
}
class TestPerson
{
static void Main()
{
// Create a new person object.
Person person1 = new Person("George", 40);
// Create another new object, copying person1.
Person person2 = new Person(person1);
System.Console.WriteLine(person2.Details);
}
}
Output
George is 40
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