DropdownList who has all world's countries

Question

Hello everyone I want to please know how I could do a dropdown list in ASP.NET that automatically includes all countries. I know how to make a simple drop-down list in asp.net but it would be exhausting to have to fill by myself all over the world. Should I do an import? Please help.

Vulpes · Answer

I'm puzzled by that error message (there is no element with a key of 'Countries') since according to this link: http://msdn.microsoft.com/en-us/library/system.web.mvc.controllerbase.viewbag(v=vs.118).aspx ViewBag is a dynamic object whose properties you can define yourself. So we should be able to give it a Countries property and then retrieve the value of that property in the view. Just wondering whether you have the controller code in the right place? According to the above link the whole method should be: public ActionResult Index() { List countries = new List (); foreach (CultureInfo culture in CultureInfo.GetCultures(CultureTypes.SpecificCultures)) { RegionInfo country = new RegionInfo(culture.LCID); if (countries.Where(p => p.Name == country.Name).Count() == 0) countries.Add(country); } List countryNames = countries.OrderBy(p => p.EnglishName).Select(p => p.EnglishName).ToList(); List items = new List (); int index = 0; foreach(string countryName in countryNames { items.Add(new SelectListItem { Text = countryName Value = index.ToString()}); index++; } ViewBag.Countries = items; return View(); }

Ramsès Zogning II · Answer

Hello Sir I finally get out. The error was in another code for my controller so the code you have given me is good. you are a champion. I could also connect the list of countries to one of my model table and everything works well. Please can you also help me about this: Internationalization of a web application VCM 4 razor. link: http://www.c-sharpcorner.com/Forums/Thread/278453/internationalization-of-a-web-application-vcm-4-razor.aspx thank you

Ramsès Zogning II · Answer

it's don't work This is the error : Il n'y a aucun élément ViewData de type « IEnumerable » avec la clé « Countries ». thk u very much for your help Sirs i will continue to fine the solution

Ramsès Zogning II · Answer

Thk u very much i try after the school and i will tell you

Vulpes · Answer

I think we've been talking at cross-purposes here Ramses because I've been using an ASP.NET web form project and it appears that you're using MVC Razor. Frankly I don't know a great deal about the latter but after studying an example of populating a DropDownList I found on the internet ( http://forums.asp.net/t/1959753.aspx?Best+way+to+populate+drop+down+lists+MVC+4+razor+ )  I hope the following will work: // Populate Countries data in controller List countries = new List (); foreach (CultureInfo culture in CultureInfo.GetCultures(CultureTypes.SpecificCultures)) { RegionInfo country = new RegionInfo(culture.LCID); if (countries.Where(p => p.Name == country.Name).Count() == 0) countries.Add(country); } List countryNames = countries.OrderBy(p => p.EnglishName).Select(p => p.EnglishName).ToList(); List items = new List (); int index = 0; foreach(string countryName in countryNames { items.Add(new SelectListItem { Text = countryName Value = index.ToString()}); index++; } ViewBag.Countries = items; // In view @Html.DropDownList(Countries)

Ramsès Zogning II · Answer

Thk Sir Joginder Banger  Ii will try to see this to resolve my problem

Ramsès Zogning II · Answer

Thank you sir When I copy and I paste your code in my controller (adding biensur using System.Globalization;) I get errors here: DropDownList1.DataSource = Countries; DropDownList1.DataBind (); It is DropDownList1 which is underlined in red. Also what does he have to put code in my view cshtml? Something like this: @ Html.DropDownList (model => model.countries)?

Vulpes · Answer

I think to make life easier I'd change the method so that it returns the names of the countries as strings rather than in a RegionInfo object. To bind to the DDL you'd then need something like this: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Globalization; // need this public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { List countries = GetCountriesByIso3166(); DropDownList1.DataSource = countries; DropDownList1.DataBind(); } } public static List GetCountriesByIso3166() { List countries = new List (); foreach (CultureInfo culture in CultureInfo.GetCultures(CultureTypes.SpecificCultures)) { RegionInfo country = new RegionInfo(culture.LCID); if (countries.Where(p => p.Name == country.Name).Count() == 0) countries.Add(country); } return countries.OrderBy(p => p.EnglishName).Select(p => p.EnglishName).ToList(); } }

Joginder Banger · Answer

hi Ramses Zogning if you want region info select any list  then you make a event the selectedIndexed_changed.

Ramsès Zogning II · Answer

Thank u Sir How can i join RegionInfo to my dropdownlist ?

Vulpes · Answer

Here's how you can get a list of all the countries in the world just by using classes in the System.Globalization namespace. http://justinchronicles.wordpress.com/2012/03/15/how-to-get-list-of-countries-defined-in-iso-3166-1-programatically-by-c-shar/ It should then be just a matter of binding this list to your DropDownList control.