不一样的虚假(Bogus)和骗子(Faker)

　　首先声明，Bogus是一个Nuget包的名称，Faker是它内部的一个类，这个库的作用就是模拟生成实体类的数据，特别适合测试时的场景，不用苦思冥想，辛辛苦苦来造不同的实体类了。当然，造出来的都是虚假的(Bogus)，骗人的(Faker)。它家在这里：https://github.com/bchavez/Bogus

　　假如我有个会员类

   enum Sex
    {
        男,
        女
    }
    class Memmber
    {
        public Guid ID { get; set; }
        public long NO { get; set; }
        public string Name { get; set; }
        public Sex Sex { get; set; }
        public int Age { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
        public decimal Balance { get; set; }
        public DateTime CreateOn { get; set; }
    }

　　这个类在测试时，要手动实例化，穿梭于各个层和方法中间，现在把构建这个类的对象(实例)，交给Bogus。

　　首先引入Bogus包

Install-Package Bogus

　　接下来就可以告诉Faker怎么来“骗人”了

var options = new JsonSerializerOptions();
options.Encoder = System.Text.Encodings.Web.JavaScriptEncoder.Create(UnicodeRanges.All);
while (true)
{
    var personFaker = new Faker()
        .RuleFor(x => x.ID, x => x.Random.Guid())
        .RuleFor(x=>x.NO,x=>x.Random.Long(100000000000,999999999999))
        .RuleFor(x => x.Name, x => x.Person.LastName + x.Person.FirstName)
        .RuleFor(x => x.Sex, x => x.Random.Enum())
        .RuleFor(x => x.Email, x => x.Person.Email)
        .RuleFor(x => x.Phone, x => x.Person.Phone)
        .RuleFor(x => x.Age, x => x.Random.Int(0, 120))
        .RuleFor(x=>x.Balance,x=>x.Finance.Amount(0,1000))                    
        .RuleFor(x => x.CreateOn, x => x.Date.Past(1));

    Console.WriteLine(JsonSerializer.Serialize(personFaker.Generate(), options));
    Console.ReadLine();
}

看一下效果：

{
  "ID":"5f3d97f6-52da-7fb6-e73f-153fd3a41bfb",
  "NO":539140308276,
  "Name":"KoeppErick",
  "Sex":0,
  "Age":48,
  "Email":"Erick.Koepp@hotmail.com",
  "Phone":"(899) 392-6546",
  "Balance":45.34,
  "CreateOn":"2021-02-14T13:32:19.892062+09:00"
}

看来，Faker是通过RuleFor来给每个属性来模拟那种格式的数据的，比如RuleFor(x => x.Email, x => x.Person.Email)，告诉Faker，这是一个Email格式，记得骗人的时候，给人家一个email格式的数据，内容随便你，那问题来了，是不是有一大组格式呢？当然，这也是这个库的作用，都有哪些？

Bogus API Support

• 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

• 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.

• 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.

• 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 - Get a random array element.

• ArrayElement - Get a random array element.

• ArrayElements - Get a random subset of an array.

• ListItem - Get a random list item.

• ListItems - Get a random subset of a List.

• CollectionItem - 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 - Picks a random Enum of T. Works only with Enums.

• Shuffle - 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 - Returns a selection of T[] based on a weighted distribution of probability.

　　是不是挺丰富的，一般场景应该够用了，如果有特殊数据模拟，也只能自已动手了。

　　对，我是一个祖国的程序员，Member类生成的实例是外国的，这不行，换一下：

  var options = new JsonSerializerOptions();
            options.Encoder = System.Text.Encodings.Web.JavaScriptEncoder.Create(UnicodeRanges.All);
            while (true)
            {
                var personFaker = new Faker("zh_CN")
                    .RuleFor(x => x.ID, x => x.Random.Guid())
                    .RuleFor(x=>x.NO,x=>x.Random.Long(100000000000,999999999999))
                    .RuleFor(x => x.Name, x => x.Person.LastName + x.Person.FirstName)
                    .RuleFor(x => x.Sex, x => x.Random.Enum())
                    .RuleFor(x => x.Email, x => x.Person.Email)
                    .RuleFor(x => x.Phone, x => x.Person.Phone)
                    .RuleFor(x => x.Age, x => x.Random.Int(0, 120))
                    .RuleFor(x=>x.Balance,x=>x.Finance.Amount(0,1000))                    
                    .RuleFor(x => x.CreateOn, x => x.Date.Past(1));

                Console.WriteLine(JsonSerializer.Serialize(personFaker.Generate(), options));
                Console.ReadLine();
            }

　　只需要在new Faker时告这个骗子是要骗祖国的程序，就可以了，看结果吧：

{
  "ID":"219d56ca-ea21-3a02-84b5-d9950ae8f384",
  "NO":362783628351,
  "Name":"徐思远",
  "Sex":0,
  "Age":100,
  "Email":"40@gmail.com",
  "Phone":"024-65735687",
  "Balance":623.22,
  "CreateOn":"2021-01-19T19:38:30.1504231+09:00"
}

其中的名字还真像个真人名，电话号也换成祖国的了。

那还支持其他国家吗？当然

其实还有Bogus有很多其他功能，大家可以自行探索。