public IEnumerable<Person> ImportPersonsFromCsvFile(string fileName)
{
if (fileName == null)
throw new ArgumentNullException(nameof(fileName));
if (!File.Exists(fileName))
throw new FileNotFoundException(nameof(fileName));
var lines = File.ReadAllLines(fileName, Encoding.Default);
if (lines.Length == 0)
throw new FormatException("File contains no lines.");
for (int i = 0; i < lines.Length; i++)
{
var personBuilder = new PersonBuilder();
var currentLine = lines[i];
ProcessLineAndSetBuildersProperties(currentLine, CsvSeparator, personBuilder);
yield return personBuilder.Build();
}
}
private void ParseFieldsAndSetBuildersProperties(string[] personFields, PersonBuilder builder)
{
if (personFields == null)
throw new ArgumentNullException(nameof(personFields));
if (personFields.Length != FieldCount)
throw new FormatException($"Incorret field count {personFields.Length}. Expected {FieldCount}.");
var personDocument = personFields[DocumentPosition];
if (personDocument == string.Empty)
throw new FormatException("Document can't be empty.");
// Simple barcode readers can't handle non-digit characters
if (personDocument.Any(c => !char.IsDigit(c)))
throw new FormatException("Document can't contain non-digit characters.");
var personName = personFields[NamePosition];
if (personName == string.Empty)
throw new FormatException("Name can't be empty.");
var personRole = (PersonRole)Enum.Parse(typeof(PersonRole), personFields[RolePosition]);
builder.Id = new GenericDocument(personDocument);
builder.Name = personName;
builder.Role = personRole;
}
private void ProcessLineAndSetBuildersProperties(string line, char separator, PersonBuilder builder)
{
var separatedFields = SeparateFields(line, separator);
ParseFieldsAndSetBuildersProperties(separatedFields, builder);
}
public PersonBuilderControl()
{
InitializeComponent();
builder = new PersonBuilder();
}