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Tony Northrup The most important guideline for globalization is a good guideline for programming in general: use strong types. For example, if you need to display the date to a user, don t simply generate a string with the month, date, and year. Instead, create a DateTime object and call ToString or another method to display the date. The built-in methods are culturally sensitive. Similarly, if you need to display currency, don t simply prefix a number with a dollar sign. Instead, format the number as currency, so that it is displayed using the current culture s currency settings.
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When you need to format data manually, you can access culture-specific formatting information using CultureInfo.NumberFormat and CultureInfo.DateTimeFormat. These properties provide access to culture-specific numeric grouping separators (such as a comma or a space), date formatting information and separators, and other elements. For example, the following Console application (which requires the System.Globalization and System.Threading namespaces) demonstrates how to use NumberFormat.NumberDecimalSeparator, NumberFormat.NumberGroupSizes, and NumberFormat.Number GroupSeparator to format a long number manually for display:
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' VB Sub Main() FormatData(New CultureInfo("es-ES")) FormatData(New CultureInfo("ru-RU")) FormatData(New CultureInfo("en-US")) Console.ReadKey() End Sub
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Lesson 1: Formatting Data for Globalization
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Private Sub FormatData(ByVal ci As CultureInfo) ' Display the selected culture Console.WriteLine(ci.ToString() + ":") ' Identify the number and copy it to a string Dim d As Double = 1234567.89 Dim formattedNumber As String = d.ToString() ' Identify the location of the culture-sensitive decimal point in the number Dim decimalIndex As Integer = formattedNumber.IndexOf( _ Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator) + 1 ' Extract only the decimal portion of the number formattedNumber = formattedNumber.Substring(decimalIndex, _ formattedNumber.Length - decimalIndex) ' Add the culture-specific decimal point before the number formattedNumber = ci.NumberFormat.NumberDecimalSeparator + _ formattedNumber ' Extract only the whole portion of the number Dim wholeDigits As String = Math.Floor(d).ToString() For a As Integer = 0 To wholeDigits.Length - 1 ' Add each whole digit to formattedNumber, with grouping separators ' Examine CultureInfo.NumberFormat.NumberGroupSizes to determine ' whether the current location requires a separator Dim requiresSeparator As Boolean = False For Each sep As Integer In ci.NumberFormat.NumberGroupSizes If (a > 0) AndAlso ((a Mod sep) = 0) Then requiresSeparator = True End If Next ' Add a separator if required If requiresSeparator Then formattedNumber = ci.NumberFormat.NumberGroupSeparator + formattedNumber End If ' Add the number to the final string formattedNumber = _ wholeDigits.ToCharArray()(wholeDigits.Length - a - 1) + formattedNumber Next ' Display the manual results and the automatically formatted version Console.WriteLine(" Manual: {0}", formattedNumber) Console.WriteLine(" Automatic: {0}", d.ToString("N", ci)) End Sub // C# public static void Main() { FormatData(new CultureInfo("es-ES")); FormatData(new CultureInfo("ru-RU"));
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FormatData(new CultureInfo("en-US")); Console.ReadKey(); } private static void FormatData(CultureInfo ci) { // Display the selected culture Console.WriteLine(ci.ToString() + ":"); // Identify the number and copy it to a string double d = 1234567.89; string formattedNumber = d.ToString(); // Identify the location of the culture-sensitive decimal point in the number int decimalIndex = formattedNumber.IndexOf( Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator) + 1; // Extract only the decimal portion of the number formattedNumber = formattedNumber.Substring( decimalIndex, formattedNumber.Length - decimalIndex); // Add the culture-specific decimal point before the number formattedNumber = ci.NumberFormat.NumberDecimalSeparator + formattedNumber; // Extract only the whole portion of the number string wholeDigits = Math.Floor(d).ToString(); // Add each whole digit to formattedNumber, with grouping separators for (int a = 0; a < wholeDigits.Length; a++) { // Examine CultureInfo.NumberFormat.NumberGroupSizes to determine // whether the current location requires a separator bool requiresSeparator = false; foreach (int sep in ci.NumberFormat.NumberGroupSizes) { if ( (a > 0) && ((a % sep) == 0) ) { requiresSeparator = true; } } // Add a separator if required if (requiresSeparator) { formattedNumber = ci.NumberFormat.NumberGroupSeparator + formattedNumber; } // Add the number to the final string formattedNumber = wholeDigits.ToCharArray()[wholeDigits.Length - a - 1] + formattedNumber; }
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