private void CreateOrUpdateContinent(bool create = true)
{
string continentName = this.TextBoxContinentName.Text;
if (string.IsNullOrEmpty(continentName) || continentName.Length < 3 || continentName == InvalidContinentError)
{
this.LiteralErrorMessages.Text = InvalidContinentError;
return;
}
using (var db = new WorldEntities())
{
if (create)
{
db.Continents.Add(new Continent()
{
ContinentName = continentName,
});
db.SaveChanges();
}
else
{
var existingContinent = db.Continents.Find(int.Parse(this.ListBoxContinents.SelectedValue));
existingContinent.ContinentName = this.TextBoxContinentName.Text;
db.SaveChanges();
}
}
this.ListBoxContinents.DataBind();
this.PanelInsertContinent.Visible = false;
}
private byte[] RetrieveFlagImage(string countryId)
{
WorldEntities db = new WorldEntities();
var country = db.Countries.Find(countryId);
if (country != null)
{
return(country.FlagImage);
}
return(null);
}
protected void ButtonDeleteContinent_Click(object sender, EventArgs e)
{
using (var db = new WorldEntities())
{
var continentToRemove = db.Continents.Find(int.Parse(this.ListBoxContinents.SelectedItem.Value));
db.Cities.RemoveRange(continentToRemove.Countries.SelectMany(c => c.Cities));
db.Countries.RemoveRange(continentToRemove.Countries);
db.Continents.Remove(continentToRemove);
db.SaveChanges();
Response.Redirect(Request.RawUrl);
}
}
protected void ButtonSaveCountry_Click(object sender, EventArgs e)
{
int continentId = int.Parse(this.ListBoxContinents.SelectedValue);
string countryName = this.TextBoxCountryName.Text;
double surfaceArea = double.Parse(this.TextBoxSurfaceArea.Text);
int population = int.Parse(this.TextBoxPopulation.Text);
string language = this.TextBoxLanguage.Text;
double latitude = double.Parse(this.TextBoxLatitude.Text);
double longitude = double.Parse(this.TextBoxLongitude.Text);
using (var db = new WorldEntities())
{
var continent = db.Continents.Find(continentId);
byte[] flagAsByteArray = null;
HttpPostedFile file = this.FileUploadFlagImage.PostedFile;
flagAsByteArray = new byte[file.ContentLength];
file.InputStream.Read(flagAsByteArray, 0, file.ContentLength);
var newCountry = new Country()
{
CountryId = countryName.Substring(0, 3).ToUpper(),
Continent = continent,
CountryName = countryName,
Language = language,
Latitude = latitude,
Longitude = longitude,
Population = population,
SurfaceArea = surfaceArea,
FlagImage = flagAsByteArray
};
db.Countries.Add(newCountry);
try
{
db.SaveChanges();
this.GridViewCountries.DataBind();
this.PanelInsertCountry.Visible = false;
this.ButtonInsertCountry.Visible = true;
}
catch (Exception ex)
{
this.LiteralErrorMessages.Text = ex.Message;
}
}
}
protected void LinkButtonDeleteCountry_Command(object sender, CommandEventArgs e)
{
using (var db = new WorldEntities())
{
string countryId = Convert.ToString(e.CommandArgument);
var countryToRemove = db.Countries
.Include(c => c.Cities)
.FirstOrDefault(c => c.CountryId == countryId);
db.Cities.RemoveRange(countryToRemove.Cities);
db.SaveChanges();
db.Countries.Remove(countryToRemove);
db.SaveChanges();
this.GridViewCountries.DataBind();
}
}
