May 27, 2007
Some people have asked me how BlogEngine.NET displays a dropdown list of countries when no source XML file is present. The simple answer is that you don’t need any external list to bind to from C#, you can instead use the CultureInfo class.
Consider that you have the following dropdown list declared in an ASP.NET page:
<asp:DropDownList runat="server" ID="ddlCountry" />
Then from code-behind, call this method which binds the countries alphabetically to the dropdown:
public void BindCountries()
{
System.Collections.Specialized.StringDictionary dic = new System.Collections.Specialized.StringDictionary();
System.Collections.Generic.List<string> col = new System.Collections.Generic.List<string>();
foreach (CultureInfo ci in CultureInfo.GetCultures(CultureTypes.AllCultures & ~CultureTypes.NeutralCultures))
{
RegionInfo ri = new RegionInfo(ci.LCID);
if (!dic.ContainsKey(ri.EnglishName))
dic.Add(ri.EnglishName, ri.TwoLetterISORegionName.ToLowerInvariant());
if (!col.Contains(ri.EnglishName))
col.Add(ri.EnglishName);
}
col.Sort();
ddlCountry.Items.Add(new ListItem("[Not specified]", ""));
foreach (string key in col)
{
ddlCountry.Items.Add(new ListItem(key, dic[key]));
}
if (ddlCountry.SelectedIndex == 0 && Request.UserLanguages != null && Request.UserLanguages[0].Length == 5)
{
ddlCountry.SelectedValue = Request.UserLanguages[0].Substring(3);
}
}
The method first adds all the countries from the CultureInfo class to a dictionary and then sorts it alphabetically. Last, it tries to retrieve the country of the browser so it can auto-select the visitors country. There might be a prettier way to sort a dictionary, but this one works.
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