Very old school way to parse Command Line arguments to compare with the Cliargs.NET package

OldSchoolCliArgs.cs

var userInputArgs = Environment.GetCommandLineArgs().Skip(1).ToArray();
if(userInputArgs.Length == 0)
{
    Console.WriteLine("Missing mandatory arguments: --name");
    return;
}

string name = string.Empty;
uint? age = null;
var currentKey = string.Empty;
foreach(var arg in userInputArgs)
{
    if(currentKey == "--name" || currentKey == "-n")
    {
        name = arg;
        currentKey = string.Empty;
        continue;
    }

    if (currentKey == "--age" || currentKey == "-a")
    {
        age = Convert.ToUInt32(arg);
        currentKey = string.Empty;
        continue;
    }

    if (arg == "--name" || arg == "-n")
    {
        currentKey = arg;
        continue;
    }

    if (arg == "--age" || arg == "-a")
    {
        currentKey = arg;
        continue;
    }

    Console.WriteLine("Error: Unkown argument {0}", arg);
    return;
}

if(string.IsNullOrWhiteSpace(name))
{
    Console.WriteLine("Wrong value for name");
    return;
}

if(age.HasValue)
{
    Console.WriteLine($"Dear {name}, you're {age.Value} years old.");
}
else
{
    Console.WriteLine($"Dear {name}, we don't know your age!");
}