https://github.com/bchavez/Bogus

public enum Gender
{
    Male,
    Female
}

//Set the randomizer seed if you wish to generate repeatable data sets.
Randomizer.Seed = new Random(8675309);

var fruit = new[] { "apple", "banana", "orange", "strawberry", "kiwi" };

var orderIds = 0;
var testOrders = new Faker<Order>()
    //Ensure all properties have rules. By default, StrictMode is false
    //Set a global policy by using Faker.DefaultStrictMode
    .StrictMode(true)
    //OrderId is deterministic
    .RuleFor(o => o.OrderId, f => orderIds++)
    //Pick some fruit from a basket
    .RuleFor(o => o.Item, f => f.PickRandom(fruit))
    //A random quantity from 1 to 10
    .RuleFor(o => o.Quantity, f => f.Random.Number(1, 10))
    //A nullable int? with 80% probability of being null.
    //The .OrNull extension is in the Bogus.Extensions namespace.
    .RuleFor(o => o.LotNumber, f => f.Random.Int(0, 100).OrNull(f, .8f));


var userIds = 0;
var testUsers = new Faker<User>()
    //Optional: Call for objects that have complex initialization
    .CustomInstantiator(f => new User(userIds++, f.Random.Replace("###-##-####")))

    //Use an enum outside scope.
    .RuleFor(u => u.Gender, f => f.PickRandom<Gender>())

    //Basic rules using built-in generators
    .RuleFor(u => u.FirstName, (f, u) => f.Name.FirstName(u.Gender))
    .RuleFor(u => u.LastName, (f, u) => f.Name.LastName(u.Gender))
    .RuleFor(u => u.Avatar, f => f.Internet.Avatar())
    .RuleFor(u => u.UserName, (f, u) => f.Internet.UserName(u.FirstName, u.LastName))
    .RuleFor(u => u.Email, (f, u) => f.Internet.Email(u.FirstName, u.LastName))
    .RuleFor(u => u.SomethingUnique, f => $"Value {f.UniqueIndex}")

    //Use a method outside scope.
    .RuleFor(u => u.CartId, f => Guid.NewGuid())
    //Compound property with context, use the first/last name properties
    .RuleFor(u => u.FullName, (f, u) => u.FirstName + " " + u.LastName)
    //And composability of a complex collection.
    .RuleFor(u => u.Orders, f => testOrders.Generate(3).ToList())
    //Optional: After all rules are applied finish with the following action
    .FinishWith((f, u) =>
        {
            Console.WriteLine("User Created! Id={0}", u.Id);
        });

var user = testUsers.Generate();
Console.WriteLine(user.DumpAsJson());

/* OUTPUT:
User Created! Id=0
 *
{
  "Id": 0,
  "FirstName": "Audrey",
  "LastName": "Spencer",
  "FullName": "Audrey Spencer",
  "UserName": "Audrey_Spencer72",
  "Email": "[email protected]",
  "Avatar": "https://s3.amazonaws.com/uifaces/faces/twitter/itstotallyamy/128.jpg",
  "CartId": "863f9462-5b88-471f-b833-991d68db8c93",
  "SSN": "923-88-4231",
  "Gender": 0,
  "Orders": [
    {
      "OrderId": 0,
      "Item": "orange",
      "Quantity": 8
    },
    {
      "OrderId": 1,
      "Item": "banana",
      "Quantity": 2
    },
    {
      "OrderId": 2,
      "Item": "kiwi",
      "Quantity": 9
    }
  ]
} */

• Address
  • ZipCode - Get a zipcode.
  • City - Get a city name.
  • StreetAddress - Get a street address.
  • CityPrefix - Get a city prefix.
  • CitySuffix - Get a city suffix.
  • StreetName - Get a street name.
  • BuildingNumber - Get a building number.
  • StreetSuffix - Get a street suffix.
  • SecondaryAddress - Get a secondary address like 'Apt. 2' or 'Suite 321'.
  • County - Get a county.
  • Country - Get a country.
  • FullAddress - Get a full address like Street, City, Country.
  • CountryCode - Get a random ISO 3166-1 country code.
  • State - Get a random state state.
  • StateAbbr - Get a state abbreviation.
  • Latitude - Get a Latitude.
  • Longitude - Get a Longitude.
  • Direction - Generates a cardinal or ordinal direction. IE: Northwest, South, SW, E.
  • CardinalDirection - Generates a cardinal direction. IE: North, South, E, W.
  • OrdinalDirection - Generates an ordinal direction. IE: Northwest, Southeast, SW, NE.
• Commerce
  • Department - Get a random commerce department.
  • Price - Get a random product price.
  • Categories - Get random product categories.
  • ProductName - Get a random product name.
  • Color - Get a random color.
  • Product - Get a random product.
  • ProductAdjective - Random product adjective.
  • ProductMaterial - Random product material.
  • Ean8 - Get a random EAN-8 barcode number.
  • Ean13 - Get a random EAN-13 barcode number.
• Company
  • CompanySuffix - Get a company suffix. "Inc" and "LLC" etc.
  • CompanyName - Get a company name.
  • CatchPhrase - Get a company catch phrase.
  • Bs - Get a company BS phrase.
• Database
  • Column - Generates a column name.
  • Type - Generates a column type.
  • Collation - Generates a collation.
  • Engine - Generates a storage engine.
• Date
  • Past - Get a DateTime in the past between refDate and yearsToGoBack.
  • PastOffset - Get a DateTimeOffset in the past between refDate and yearsToGoBack.
  • Soon - Get a DateTime that will happen soon.
  • SoonOffset - Get a DateTimeOffset that will happen soon.
  • Future - Get a DateTime in the future between refDate and yearsToGoForward.
  • FutureOffset - Get a DateTimeOffset in the future between refDate and yearsToGoForward.
  • Between - Get a random DateTime between start and end.
  • BetweenOffset - Get a random DateTimeOffset between start and end.
  • Recent - Get a random DateTime within the last few days.
  • RecentOffset - Get a random DateTimeOffset within the last few days.
  • Timespan - Get a random TimeSpan.
  • Month - Get a random month.
  • Weekday - Get a random weekday.
• Finance
  • Account - Get an account number. Default length is 8 digits.
  • AccountName - Get an account name. Like "savings", "checking", "Home Loan" etc..
  • Amount - Get a random amount. Default 0 - 1000.
  • TransactionType - Get a transaction type: "deposit", "withdrawal", "payment", or "invoice".
  • Currency - Get a random currency.
  • CreditCardNumber - Generate a random credit card number with valid Luhn checksum.
  • CreditCardCvv - Generate a credit card CVV.
  • BitcoinAddress - Generates a random Bitcoin address.
  • EthereumAddress - Generate a random Ethereum address.
  • RoutingNumber - Generates an ABA routing number with valid check digit.
  • Bic - Generates Bank Identifier Code (BIC) code.
  • Iban - Generates an International Bank Account Number (IBAN).
• Hacker
  • Abbreviation - Returns an abbreviation.
  • Adjective - Returns a adjective.
  • Noun - Returns a noun.
  • Verb - Returns a verb.
  • IngVerb - Returns a verb ending with -ing.
  • Phrase - Returns a phrase.
• Images
  • DataUri - Get a SVG data URI image with a specific width and height.
  • PicsumUrl - Get an image from the https://picsum.photos service.
  • PlaceholderUrl - Get an image from https://placeholder.com service.
  • LoremFlickrUrl - Get an image from https://loremflickr.com service.
  • LoremPixelUrl - Creates an image URL with http://lorempixel.com. Note: This service is slow. Consider using PicsumUrl() as a faster alternative.
    • Abstract - Gets an abstract looking image.
    • Animals - Gets an image of an animal.
    • Business - Gets a business looking image.
    • Cats - Gets a picture of a cat.
    • City - Gets a city looking image.
    • Food - Gets an image of food.
    • Nightlife - Gets an image with city looking nightlife.
    • Fashion - Gets an image in the fashion category.
    • People - Gets an image of humans.
    • Nature - Gets an image of nature.
    • Sports - Gets an image related to sports.
    • Technics - Get a technology related image.
    • Transport - Get a transportation related image.
• Internet
  • Avatar - Generates a legit Internet URL avatar from twitter accounts.
  • Email - Generates an email address.
  • ExampleEmail - Generates an example email with @example.com.
  • UserName - Generates user names.
  • UserNameUnicode - Generates a user name preserving Unicode characters.
  • DomainName - Generates a random domain name.
  • DomainWord - Generates a domain word used for domain names.
  • DomainSuffix - Generates a domain name suffix like .com, .net, .org
  • Ip - Gets a random IPv4 address string.
  • Port - Generates a random port number.
  • IpAddress - Gets a random IPv4 IPAddress type.
  • IpEndPoint - Gets a random IPv4 IPEndPoint.
  • Ipv6 - Generates a random IPv6 address string.
  • Ipv6Address - Generate a random IPv6 IPAddress type.
  • Ipv6EndPoint - Gets a random IPv6 IPEndPoint.
  • UserAgent - Generates a random user agent.
  • Mac - Gets a random mac address.
  • Password - Generates a random password.
  • Color - Gets a random aesthetically pleasing color near the base RGB. See here.
  • Protocol - Returns a random protocol. HTTP or HTTPS.
  • Url - Generates a random URL.
  • UrlWithPath - Get an absolute URL with random path.
  • UrlRootedPath - Get a rooted URL path like: /foo/bar. Optionally with file extension.
• Lorem
  • Word - Get a random lorem word.
  • Words - Get an array of random lorem words.
  • Letter - Get a character letter.
  • Sentence - Get a random sentence of specific number of words.
  • Sentences - Get some sentences.
  • Paragraph - Get a paragraph.
  • Paragraphs - Get a specified number of paragraphs.
  • Text - Get random text on a random lorem methods.
  • Lines - Get lines of lorem.
  • Slug - Slugify lorem words.
• Name
  • FirstName - Get a first name. Getting a gender specific name is only supported on locales that support it.
  • LastName - Get a last name. Getting a gender specific name is only supported on locales that support it.
  • FullName - Get a full name, concatenation of calling FirstName and LastName.
  • Prefix - Gets a random prefix for a name.
  • Suffix - Gets a random suffix for a name.
  • FindName - Gets a full name.
  • JobTitle - Gets a random job title.
  • JobDescriptor - Get a job description.
  • JobArea - Get a job area expertise.
  • JobType - Get a type of job.
• Phone
  • PhoneNumber - Get a phone number.
  • PhoneNumberFormat - Gets a phone number based on the locale's phone_number.formats[] array index.
• Rant
  • Review - Generates a random user review.
  • Reviews - Generate an array of random reviews.
• System
  • FileName - Get a random file name.
  • DirectoryPath - Get a random directory path (Unix).
  • FilePath - Get a random file path (Unix).
  • CommonFileName - Generates a random file name with a common file extension.
  • MimeType - Get a random mime type.
  • CommonFileType - Returns a commonly used file type.
  • CommonFileExt - Returns a commonly used file extension.
  • FileType - Returns any file type available as mime-type.
  • FileExt - Gets a random extension for the given mime type.
  • Semver - Get a random semver version string.
  • Version - Get a random Version.
  • Exception - Get a random Exception with a fake stack trace.
  • AndroidId - Get a random GCM registration ID.
  • ApplePushToken - Get a random Apple Push Token.
  • BlackBerryPin - Get a random BlackBerry Device PIN.
• Vehicle
  • Vin - Generate a vehicle identification number (VIN).
  • Manufacturer - Get a vehicle manufacture name. IE: Toyota, Ford, Porsche.
  • Model - Get a vehicle model. IE: Camry, Civic, Accord.
  • Type - Get a vehicle type. IE: Minivan, SUV, Sedan.
  • Fuel - Get a vehicle fuel type. IE: Electric, Gasoline, Diesel.
• Random/Randomizer
  • Number - Get an int from 0 to max.
  • Digits - Get a random sequence of digits.
  • Even - Returns a random even number.
  • Odd - Returns a random odd number.
  • Double - Get a random double, between 0.0 and 1.0.
  • Decimal - Get a random decimal, between 0.0 and 1.0.
  • Float - Get a random float, between 0.0 and 1.0.
  • Byte - Generate a random byte between 0 and 255.
  • Bytes - Get a random sequence of bytes.
  • SByte - Generate a random sbyte between -128 and 127.
  • Int - Generate a random int between MinValue and MaxValue.
  • UInt - Generate a random uint between MinValue and MaxValue.
  • ULong - Generate a random ulong between -128 and 127.
  • Long - Generate a random long between MinValue and MaxValue.
  • Short - Generate a random short between MinValue and MaxValue.
  • UShort - Generate a random ushort between MinValue and MaxValue.
  • Char - Generate a random char between MinValue and MaxValue.
  • Chars - Generate a random chars between MinValue and MaxValue.
  • String - Get a string of characters of a specific length.
  • String2 - Get a string of characters with a specific length drawing characters from chars.
  • Hash - Return a random hex hash. Default 40 characters, aka SHA-1.
  • Bool - Get a random boolean.
  • ArrayElement<T> - Get a random array element.
  • ArrayElement - Get a random array element.
  • ArrayElements<T> - Get a random subset of an array.
  • ListItem<T> - Get a random list item.
  • ListItems<T> - Get a random subset of a List.
  • CollectionItem<T> - Get a random collection item.
  • ReplaceNumbers - Replaces symbols with numbers.
  • ReplaceSymbols - Replaces each character instance in a string.
  • Replace - Replaces symbols with numbers and letters. # = number, ? = letter, * = number or letter.
  • ClampString - Clamps the length of a string between min and max characters.
  • Enum<T> - Picks a random Enum of T. Works only with Enums.
  • Shuffle<T> - Shuffles an IEnumerable source.
  • Word - Returns a single word or phrase in English.
  • Words - Gets some random words and phrases in English.
  • WordsArray - Get a range of words in an array (English).
  • Guid - Get a random GUID.
  • Uuid - Get a random GUID. Alias for Randomizer.Guid().
  • RandomLocale - Returns a random locale.
  • AlphaNumeric - Returns a random set of alpha numeric characters 0-9, a-z.
  • Hexadecimal - Generates a random hexadecimal string.
  • WeightedRandom<T> - Returns a selection of T[] based on a weighted distribution of probability.