public void FindPopulationByCodeDctnr()
{
Dictionary <string, Country> countries = new Dictionary <string, Country>();
StreamReader sr = new StreamReader(_csvFilePath);
// read header line
sr.ReadLine();
string csvLine;
while ((csvLine = sr.ReadLine()) != null)
{
Country countryToFill = ReadCountryFromCsvLine(csvLine);
countries.Add(countryToFill.Code, countryToFill);
}
sr.Close();
Console.Write("Which country code do you want to look up? ");
string countryCode = Console.ReadLine();
Country countryToSearch;
bool existsCountry = countries.TryGetValue(countryCode, out countryToSearch);
while (!existsCountry)
{
Console.WriteLine($"Sorry, there is no country with code {countryCode}");
Console.Write("Try again: ");
countryCode = Console.ReadLine();
existsCountry = countries.TryGetValue(countryCode, out countryToSearch);
}
Console.WriteLine(PopulationFormatter.PrintCountries(countryToSearch.Name, countryToSearch.Population, 1));
}
public void ReadFirstNCountriesArr()
{
Console.Write("\nHow many top countries do you want to list? ");
int count;
while (!int.TryParse(Console.ReadLine(), out count))
{
Console.Write("Not a number, try again: ");
}
Country[] countries = new Country[count];
StreamReader sr = new StreamReader(_csvFilePath);
// read header line
sr.ReadLine();
for (int i = 0; i < count; i++)
{
string csvLine = sr.ReadLine();
if (string.IsNullOrEmpty(csvLine))
{
break;
}
countries[i] = ReadCountryFromCsvLine(csvLine);
}
sr.Close();
// remove all empty items
countries = countries.Where(x => !Country.IsNull(x)).ToArray();
Console.WriteLine(PopulationFormatter.PrintCountries(countries));
}
public void ReadAllCountriesLst()
{
List <Country> countries = new List <Country>();
StreamReader sr = new StreamReader(_csvFilePath);
// read header line
sr.ReadLine();
string csvLine;
while ((csvLine = sr.ReadLine()) != null)
{
countries.Add(ReadCountryFromCsvLine(csvLine));
}
sr.Close();
Console.WriteLine(PopulationFormatter.PrintCountries(countries));
}