static void Main(string[] args)
{
var filePath = "Employee.txt";
//OLD WAY: using employee class to store employee info as well as perform read/write and date conversion operations
EmployeeOld empOld = new EmployeeOld
{
Id = 1001,
Name = "John",
DateOfBirth = new DateTime(1985, 7, 22)
};
empOld.Save(empOld, filePath);
EmployeeOld recordOld = empOld.Load(1001, filePath);
//BETTER WAY: with Single Responsibility (delegating read/write and date conversion to separate classes)
EmployeeNew empNew = new EmployeeNew
{
Id = 1002,
Name = "Becky",
DateOfBirth = new DateTime(1987, 2, 27)
};
Persistence.Save(empNew, filePath);
EmployeeNew recordNew = Persistence.Load(1002, filePath);
Console.ReadKey();
}
public EmployeeOld Load(int id, string filePath)
{
EmployeeOld emp = null;
var requestedId = id.ToString();
if (File.Exists(filePath))
{
List <string> rows = File.ReadLines(filePath).ToList();
foreach (var row in rows)
{
var array = row.Split(',');
if (array[0] == requestedId)
{
int empId = Convert.ToInt32(array[0]);
string name = array[1];
DateTime dob = ToDateTime(array[2]);
emp = new EmployeeOld
{
Id = empId,
Name = name,
DateOfBirth = dob
};
break;
}
}
}
return(emp);
}
public void Save(EmployeeOld employee, string filePath)
{
string line = string.Join(",", employee.Id, employee.Name, ToDateString(employee.DateOfBirth));
using (StreamWriter sw = File.AppendText(filePath))
{
sw.WriteLine(line);
}
}