public Guid?CreateStudent(Student student)
{
if (student != null)
{
var incomingStudent = student;
var students = GetAllStudents();
if (students.Count() >= _configureService.GetMaxLength())
{
if (students.Count() == _configureService.GetMaxLength())
{
students.RemoveFirst();
incomingStudent.Id = Guid.NewGuid();
students.AddLast(incomingStudent);
}
}
else
{
incomingStudent.Id = Guid.NewGuid();
students.AddLast(incomingStudent);
}
_fileService.WriteToFile(students);
return(incomingStudent.Id);
}
return(null);
}
public LinkedList <Student> ReadFromFile()
{
if (File.Exists(GetFullPath()))
{
using (StreamReader streamReader = new StreamReader(GetFullPath()))
{
if (_configureService.GetDocumentType().Equals("json"))
{
string file = streamReader.ReadToEnd();
var readedStudents = JsonConvert.DeserializeObject <LinkedList <Student> >(file);
var result = readedStudents ?? new LinkedList <Student>();
var itemsToDelete = result.Count - _configureService.GetMaxLength();
while (itemsToDelete-- > 0)
{
result.RemoveFirst();
}
return(result);
}
else
{
var serializer = new XmlSerializer(typeof(List <Student>));
using (var xmlReader = new XmlTextReader(streamReader))
{
if (!serializer.CanDeserialize(xmlReader))
{
return(new LinkedList <Student>());
}
var readedStudents = serializer.Deserialize(xmlReader) as List <Student>;
var temporaryResult = readedStudents ?? new List <Student>();
var result = new LinkedList <Student>(temporaryResult);
var itemsToDelete = result.Count - _configureService.GetMaxLength();
while (itemsToDelete-- > 0)
{
result.RemoveFirst();
}
return(result);
}
}
}
}
else
{
if (_configureService.GetDocumentType().Equals("json"))
{
using (FileStream fstream = File.Create(GetFullPath()))
{
}
}
if (_configureService.GetDocumentType().Equals("xml"))
{
new XDocument(new XElement("root")).Save(GetFullPath());
}
return(new LinkedList <Student>());
}
}