CsvReportGenerator

teamB_Homework.cs

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;

namespace CsvReportGeneratorTests
{
    public class CsvReportAttribute : Attribute
    {
        public CsvReportAttribute(string name)
        {
            Name = name;
        }

        public string Name { get; }
    }

    public class Person
    {
        [CsvReport("Name")]
        public string Name { get; set; }

        [CsvReport("WhatEver")]
        public int Age { get; set; }
    }

    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestMethod1()
        {
            var people = new List<Person>
            {
                new Person {Name = "Scot", Age = 18},
                new Person {Name = "Joey", Age = 20},
                new Person {Name = "Flash", Age = 36},
            };

            var csvContent = GetResult(people);
            File.WriteAllLines(@"E:\report.csv", csvContent);

            var expected = new List<string>
            {
                "Name,WhatEver",
                "Scot,18",
                "Joey,20",
                "Flash,36"
            };

            CollectionAssert.AreEqual(expected, csvContent.ToList());
        }

        private static IEnumerable<string> GetAttributeNamesFromProperty()
        {
            foreach (var p in typeof(Person).GetProperties())
            {
                yield return p.GetCustomAttributes().Cast<CsvReportAttribute>().First().Name;
            }
        }

        private static IEnumerable<string> GetLineFromPerson(Person person)
        {
            foreach (var p in typeof(Person).GetProperties())
            {
                yield return Convert.ToString(p.GetValue(person));
            }
        }

        private string GetFirstLine()
        {
            return string.Join(",", GetAttributeNamesFromProperty());
        }

        private IEnumerable<string> GetResult(List<Person> people)
        {
            yield return GetFirstLine();

            foreach (var person in people)
            {
                yield return string.Join(",", GetLineFromPerson(person));
            }
        }
    }
}