How to declare a C# Record Type?

Question

I read on a blog that C# 7 will feature record types

class studentInfo(string StudentFName, string StudentMName, string StudentLName);

However

Answer 1

C#9 is now available and records with it.

Here are some example:

public record Person
{
    public string LastName { get; init; }
    public string FirstName { get; init; }

    public Person(string first, string last) => (FirstName, LastName) = (first, last);
}

With the use of positional records (and inheritance):

public record Teacher(string FirstName, string LastName,
    string Subject)
    : Person(FirstName, LastName);

public sealed record Student(string FirstName,
    string LastName, int Level)
    : Person(FirstName, LastName);

var person = new Person("Bill", "Wagner");

var (first, last) = person;
Console.WriteLine(first);
Console.WriteLine(last);

Finally, records support with-expressions. A with-expression instructs the compiler to create a copy of a record, but with specified properties modified:

Person brother = person with { FirstName = "Paul" };

Everything you need to know about every new features including records here