concise-equality.cs

using System;
using System.Collections.Generic;

var data1 = new Data("data1");
var data2 = new Data("data2");
Console.WriteLine(new DataEqualityComparer().Equals(data1, data2));

public record Data(string SomeProp);

public class DataEqualityComparer : IEqualityComparer<Data>
{
    public bool Equals(Data x, Data y)
    {
        return
            ReferenceEquals(x, y) ||  // true when: both null, same ref
            x is null == y is null && // true when: both not null
            x.SomeProp == y.SomeProp; // true when: equal properties
    }

    /// <inheritdoc />
    public int GetHashCode(
        Data obj)
    {
        return HashCode.Combine(obj.SomeProp);
    }
}

​concise-equality.output.txt

False

​​.sharplab.json

{
    "version": 1,
    "target": "Run",
    "mode": "Debug",
    "branch": "core-x64"
}