RegionInfo Constructor (String)

 

Initializes a new instance of the RegionInfo class based on the country/region or specific culture, specified by name.

Namespace:   System.Globalization
Assembly:  mscorlib (in mscorlib.dll)

public RegionInfo(
	string name
)

Parameters

name
Type: System.String

A string that contains a two-letter code defined in ISO 3166 for country/region.

-or-

A string that contains the culture name for a specific culture, custom culture, or Windows-only culture. If the culture name is not in RFC 4646 format, your application should specify the entire culture name instead of just the country/region.

Exception Condition
ArgumentNullException

name is null.

ArgumentException

name is not a valid country/region name or specific culture name.

The name parameter is either one of the codes defined for country/region, or a specific, custom, or Windows-only culture name. Case is not significant. However, the Name, the TwoLetterISORegionName, and the ThreeLetterISORegionName properties return the specified code or culture name in uppercase.

The predefined RegionInfo names are listed in Country names and code elements on the ISO website.

You should provide the name of a specific culture rather than just a country/region name in the name parameter. For example, en-US for English (United States) or es-US for Spanish (United States) is preferable to US because properties such as NativeName and CurrencyNativeName reflect a specific language. az-Latn-AZ or az-Cyrl-AZ is preferable to AZ because properties such as NativeName, CurrencyNativeName, and CurrencySymbol reflect a specific script. The predefined culture names are listed in the National Language Support (NLS) API Reference at the Go Global Developer Center. Note that a call to this constructor throws an ArgumentException if name is a neutral culture (such as en for English).

Notes to Callers:

This constructor accepts only specific cultures or country/region codes. However, some neutral culture names are the same as country/region codes. In this case, name is interpreted as a country/region code rather than a neutral culture name, and this constructor does not throw an ArgumentException.

The following code example compares two instances of RegionInfo that were created differently.

using System;
using System.Globalization;

public class SamplesRegionInfo  {

   public static void Main()  {

      // Creates a RegionInfo using the ISO 3166 two-letter code.
      RegionInfo myRI1 = new RegionInfo( "US" );

      // Creates a RegionInfo using a CultureInfo.LCID.
      RegionInfo myRI2 = new RegionInfo( new CultureInfo("en-US",false).LCID );

      // Compares the two instances.
      if ( myRI1.Equals( myRI2 ) )
         Console.WriteLine( "The two RegionInfo instances are equal." );
      else
         Console.WriteLine( "The two RegionInfo instances are NOT equal." );

   }

}

/*
This code produces the following output.

The two RegionInfo instances are equal.

*/

The following code example creates instances of RegionInfo using culture names.

using System;
using System.Globalization;

public class SamplesRegionInfo  {

   public static void Main()  {

      // Creates an array containing culture names.
      String[] myCultures = new String[]  { "", "ar", "ar-DZ", "en", "en-US" };

      // Creates a RegionInfo for each of the culture names.
      //    Note that "ar" is the culture name for the neutral culture "Arabic",
      //    but it is also the region name for the country/region "Argentina";
      //    therefore, it does not fail as expected.
      Console.WriteLine("Without checks...");
      foreach (String culture in myCultures)  {
         try  {
            RegionInfo myRI = new RegionInfo( culture );
         }
         catch ( ArgumentException e )  {
            Console.WriteLine( e.ToString() );
         }
      }

      Console.WriteLine();

      Console.WriteLine( "Checking the culture names first..." );
      foreach (String culture in myCultures)  {
         if ( culture == "" )  {
            Console.WriteLine("The culture is the invariant culture.");
         }
         else  {
            CultureInfo myCI = new CultureInfo( culture, false );
            if ( myCI.IsNeutralCulture )
               Console.WriteLine( "The culture {0} is a neutral culture.", culture );
            else   {
               Console.WriteLine( "The culture {0} is a specific culture.", culture );
               try  {
                  RegionInfo myRI = new RegionInfo( culture );
               }
               catch ( ArgumentException e )  {
                  Console.WriteLine( e.ToString() );
               }
            }
         }
      }

   }

}

/*
This code produces the following output.

Without checks...
System.ArgumentException: Region name '' is not supported.
Parameter name: name
   at System.Globalization.RegionInfo..ctor(String name)
   at SamplesRegionInfo.Main()
System.ArgumentException: Region name 'en' is not supported.
Parameter name: name
   at System.Globalization.CultureTableRecord..ctor(String regionName, Boolean useUserOverride)
   at System.Globalization.RegionInfo..ctor(String name)
   at SamplesRegionInfo.Main()

Checking the culture names first...
The culture is the invariant culture.
The culture ar is a neutral culture.
The culture ar-DZ is a specific culture.
The culture en is a neutral culture.
The culture en-US is a specific culture.

*/

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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