using System;

using OptionTypes;

​

public class Program

{

    public static void Main()

    {

        var procedureResult = DoProcedure();

        var resultToPrint = procedureResult.Match(_ => "All good!", err => err switch

        {

            DbError _ => "DbError",

            NetworkingFailure => "NetworkingFailure",

            HamsterAteCable => "HamsterAteCable",

            InvalidNumber => "InvalidNumber",

        });

        Console.WriteLine(resultToPrint);

        var procedureResultWithEnum = DoProcedureWithEnum();

        var resultToPrintWithEnum = procedureResultWithEnum.Match(_ => "All good!", err => err switch

        {

            ProcedureErrorEnum.DbError => "DbError",

            ProcedureErrorEnum.NetworkingFailure => "NetworkingFailure",

            ProcedureErrorEnum.HamsterAteCable => "HamsterAteCable",

            ProcedureErrorEnum.InvalidNumber => "InvalidNumber",

        });

        Console.WriteLine(resultToPrintWithEnum);

    }

​

    public enum ProcedureErrorEnum

    {

        DbError,

        NetworkingFailure,

        HamsterAteCable,

        InvalidNumber,

        // Uncomment

        //AnotherTypeOfError

    }

​

    public abstract record ProcedureError;

    public record DbError : ProcedureError;

    public record NetworkingFailure : ProcedureError;

    public record HamsterAteCable : ProcedureError;

    public record InvalidNumber : ProcedureError;

    // With records

    public static Result<Unit, ProcedureError> DoProcedure()

    {

        return Result<Unit, ProcedureError>.Error(new DbError());

    }

​

    public static Result<Unit, ProcedureErrorEnum> DoProcedureWithEnum()

    {

        return Result<Unit, ProcedureErrorEnum>.Error(ProcedureErrorEnum.DbError);

    }

}