Testing out the new C# 9 Records, and wanting clarification on why sequence equality doesn't work on Records?
Say that I have the below code:
public record Person(string FirstName, string LastName);
The following code will return true for equality (nothing surprising here):
var first = new Person("Bruce", "Wayne");
var second = new Person("Bruce", "Wayne");
var result = first == second; // Returns true
However if I create the following record:
public record Basket(string[] Items);
And I do a similar test:
var first = new Basket(new[] { "Banana", "Apple" });
var second = new Basket(new[] { "Banana", "Apple" });
var result = first == second;
The result will return false. This can be solved by defining your own Equals method:
public record Basket(string[] Items)
{
public virtual bool Equals(Basket other)
{
return Items.SequenceEqual(other.Items);
}
public override int GetHashCode() => Items.GetHashCode();
}
But am curious as to the decision behind this (if any).