// See description of this fiddle in blog post:

// https://medium.com/entech-solutions/generate-realistic-test-data-in-net-with-interactive-examples-33343c543a68

​

using System;

using System.Text.Json;

​

using Bogus;

​

​

public class Program

{

    public static void Main()

    {

        TestNoStrictModeMissingPropertyRule();

        TestStrictModeMissingPropertyRule();

        TestGlobalStrictModeMissingPropertyRule();

    }

​

    public static void TestNoStrictModeMissingPropertyRule()

    {

        WriteTitle("No strict mode. FirstName only.");

        var personFaker = new Faker<Person>()

            .RuleFor(p => p.FirstName, f  => f.Name.FirstName());

        var person = personFaker.Generate();

        WriteJson(person);

    }

    public static void TestStrictModeMissingPropertyRule()

    {

        WriteTitle("Yes strict mode. FirstName only.");

        var personFaker = new Faker<Person>()

            .StrictMode(true)

            .RuleFor(p => p.FirstName, f  => f.Name.FirstName());

        try

        {

            var person = personFaker.Generate();

        }

        catch (Exception e)

        {

            Console.WriteLine("Exception: ");

            Console.WriteLine(e.Message);   

        }

    }

    public static void TestGlobalStrictModeMissingPropertyRule()

    {

        WriteTitle("Yes global strict mode. FirstName only.");

        Faker.DefaultStrictMode = true;

        var personFaker = new Faker<Person>()

            .StrictMode(true)

            .RuleFor(p => p.FirstName, f  => f.Name.FirstName());

        try

        {

            var person = personFaker.Generate();

        }

        catch (Exception e)

        {

            Console.WriteLine("Exception: ");

            Console.WriteLine(e.Message);   

        }

    }

    public static void WriteTitle(string title)

    {

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("====================================");

        Console.WriteLine();

        Console.WriteLine(title);

        Console.WriteLine();

​

    }

    public static void WriteJson(object obj)

    {

        var options = new JsonSerializerOptions { WriteIndented = true};

        var json = JsonSerializer.Serialize(obj, options);

        Console.WriteLine(json);

    }

}

​

​

public class Person

{

    public string FirstName {get; set;}

    public string LastName {get; set;}

}