Object Oriented Programming using C#
Generic Collections and how to Serialize them
By overriding Equals() and GetHashCode() methods C# will prevent objects with duplicate data (in this case with duplicate
name and dates of birth) from being added to the set.
The full code for the class Account is given below.
class Account
{
private String name;
public String Name
{
get { return name; }
}
private String dateOfBirth;
public String DateOfBirth
{
get { return dateOfBirth; }
}
private int balance;
public Account(String name, String dob)
{
this.name = name;
this.dateOfBirth = dob;
balance = 0;
}
public void DepositMoney(int increase)
{
balance = balance + increase;
}
public override String ToString()
{
return “Name: “ + name + “\nBalance : “ + balance;
}
public override bool Equals(object obj)
{
Account a = (Account)obj;
return ( (name==a.Name) && (dateOfBirth==a.DateOfBirth));
}
public override int GetHashCode()
{
return (name + dateOfBirth).GetHashCode();
}
}The code above is identical to the previous version of the Account class (when we used lists) except for the addition
the overridden methods Equals() and GetHashCode(). When storing any object in a set we must override both of these
methods to prevent duplicates being stored.