fake-user.linq

void Main()
{	
	var text = File.ReadAllText(@"C:\Users\Eric\Desktop\5000-random-people.json");
	var users = JsonConvert.DeserializeAnonymousType(text, new { Results = default(IList<UserProfile>) }).Results;
	using var sw = new StreamWriter(@"C:\Users\Eric\Desktop\5000-random-people.vcf");
	
	foreach(var u in users){
		sw.WriteLine(ConvertToVCard(u));
	}
}

static string ConvertToVCard(UserProfile user){
	var fullName = $"{SanitizeValue(user.Name?.Title)} {SanitizeValue(user.Name?.First)} {SanitizeValue(user.Name?.Last)}".Trim();
	var address = $"{user.Location?.Street?.Number} {SanitizeValue(user.Location?.Street?.Name)}".Trim();
	var vcard = $@"
BEGIN:VCARD
VERSION:3.0
FN:{fullName}
UID:b850444a-9caf-40a8-b29a-656d6e3e65a7
N:{SanitizeValue(user.Name?.Last)};{SanitizeValue(user.Name?.First)};;;
BDAY:{user.DOB?.Date.ToString("yyyyMMdd")}19681016
EMAIL:{SanitizeValue(user.Email)}
TEL:{SanitizeValue(user.Phone)}
TEL:{SanitizeValue(user.Cell)}
ADR:;;{SanitizeValue(user.Location?.Postcode)};{SanitizeValue(user.Location?.City)};{SanitizeValue(user.Location?.State)};{SanitizeValue(user.Location?.Postcode)};{SanitizeValue(user.Location?.Country)}
{ConvertPhoto(user.Picture?.Large)}
END:VCARD
";

	return vcard;
}

static string SanitizeValue(string value)
{
	if(value == null) return value;
	
	var sb = new StringBuilder();
	
	foreach(var c in value.ToArray()){
		if(c == '\\' || c == ';' || c==',' || c=='\n'){
			sb.Append('\\');
		}
		
		sb.Append(c);
	}
	
	return sb.ToString();
}

static string ConvertPhoto(string url)
{
	return "PHOTO:";
	if(string.IsNullOrWhiteSpace(url)) return "PHOTO:";
	
	var client = new WebClient();
	var data = client.DownloadData(url);
	var str = $"PHOTO;ENCODING=BASE64:{Convert.ToBase64String(data)}";
	var sb = new StringBuilder();
	var limit = 75;
	
	for (int i = 0; i < str.Length / limit; i++)
	{
		sb.AppendLine(str.Substring(i * limit, limit));
	}	
	
	return sb.ToString();
}

static void DownloadPhotos()
{
	var urlPattern = "https://randomuser.me/api/portraits/{type}/{index}.jpg";
	var indexes = Enumerable.Range(-1, 200);
	var types = new string[] { "men", "women", "lego" };
	var list = indexes.SelectMany(
		i => types.Select(t => new { Type = t, Index = i == -1 ? "undefined" : i.ToString() })
	);

	var tasks = list.Select(
		item => Task.Factory.StartNew(
			state =>
			{
				using var client = new WebClient();
				var url = urlPattern.Replace("{type}", item.Type).Replace("{index}", item.Index);
				client.DownloadFile(
					url,
					$@"C:\Users\Eric\Desktop\fakeusers\{item.Type}-" + Path.GetFileName(url)
				);
				Console.WriteLine(url);
			}, TaskCreationOptions.None
		)
	);
	Task.WhenAll(tasks);
	Console.WriteLine("Complete");
}

// You can define other methods, fields, classes and namespaces here
public class UserProfile
{
	public string Gender { get; set; }
	public NameProfile Name { get; set; }
	public LocationProfile Location { get; set; }
	public string Email { get; set; }
	public LoginProfile Login { get; set; }
	public DOBProfile DOB { get; set; }
	public string Phone { get; set; }
	public string Cell { get; set; }
	public PictureProfile Picture { get; set; }


	public class NameProfile{
		public string Title { get; set; }
		public string First { get; set; }
		public string Last { get; set; }
	}

	public class LocationProfile
	{
		public StreetProfile Street { get; set; }
		public string City { get; set; }
		public string State { get; set; }
		public string Country { get; set; }
		public string Postcode { get; set; }
		public CoodinatesProfile Coodinates { get; set; }
	}

	public class StreetProfile
	{
		public int Number { get; set; }
		public string Name { get; set; }
	}

	public class CoodinatesProfile
	{
		public float Latitude { get; set; }
		public float Longitude { get; set; }
	}

	public class LoginProfile
	{
		public string UUID { get; set; }
		public string UserName { get; set; }
		public string Password { get; set; }
	}

	public class DOBProfile
	{
		public DateTime Date { get; set; }
		public int Age { get; set; }
	}

	public class PictureProfile
	{
		public string Large { get; set; }
		public string Medium { get; set; }
		public string Thumbnail { get; set; }
	}
}