What methods can be used to guarantee the security of APIs?

The equals() method in C# is used to determine object equality. In a Dictionary, it plays a key role in comparing keys to see if they are the same. If two keys are considered equal by Equals(), they are treated as the same element, and the value will be updated.

It is important for the key class to correctly override Equals() and GetHashCode(), otherwise the Dictionary may behave incorrectly.

Example of overriding:

class Person
{
    public string Name { get; set; }
    public int Age { get; set; }

    public override bool Equals(object obj)
    {
        if (obj is Person other)
            return Name == other.Name && Age == other.Age;
        return false;
    }

    public override int GetHashCode()
    {
        return HashCode.Combine(Name, Age);
    }
}