How do I implement custom equality in C#?

How do I implement custom equality in C#?

To implement custom equality in C#, you need to override the Equals method and the GetHashCode method in your class.

Can you show me an example of that?

Sure! Here's a simple example:

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

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

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

What if I want to compare objects based on just one property?

You can modify the Equals method to only compare the specific property. For example, if you only want to compare by Name:

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