cultureinfo（CultureInfo）

最佳答案CultureInfoIntroduction The CultureInfo class in .NET represents culture-specific information and provides various methods to format and manipulate strings, dat...

CultureInfo

Introduction

The CultureInfo class in .NET represents culture-specific information and provides various methods to format and manipulate strings, dates, and numbers according to a specific culture. It is an essential component for building global applications that cater to users from different regions and languages.

Working with Cultures

When developing software that targets international users, it is crucial to handle cultural differences appropriately. The CultureInfo class helps in achieving this by providing a way to bind cultural information to your program. This includes rules for text sorting, number formatting, date and time formatting, and linguistic conventions.

1. Creating CultureInfo Objects

You can create a CultureInfo object by specifying the culture name or culture identifier. For example, to create a CultureInfo object for the United States, you can use:

CultureInfo usCulture = new CultureInfo(\"en-US\");

The culture names follow the standard language and region codes. The language code is based on ISO 639-1, and the region code is based on ISO 3166. You can also use the culture identifier, which is a positive integer value assigned to each culture. For example:

CultureInfo germanCulture = new CultureInfo(1031);

2. Culture-Specific Formatting

Once you have a CultureInfo object, you can use it to format numbers, dates, and strings according to that culture's conventions. The ToString() method of numeric and date-time types supports culture-specific formatting. For example:

double number = 1234.56;string formattedNumber = number.ToString(\"N\", usCulture); // Output: 1,234.56DateTime now = DateTime.Now;string formattedDate = now.ToString(\"D\", germanCulture); // Output: 09. Juli 2022

3. Culture-Specific Parsing

The CultureInfo class also provides methods for parsing culture-specific strings back to numeric, date, and time types. The Parse() method of numeric and date-time types supports culture-specific parsing. For example:

string numericString = \"1,234.56\";double parsedNumber = double.Parse(numericString, usCulture); // parsedNumber = 1234.56string dateString = \"09 Juli 2022\";DateTime parsedDate = DateTime.Parse(dateString, germanCulture); // parsedDate = 2022-07-09

Culture-Independent Operations

In addition to the culture-specific operations, the CultureInfo class also provides culture-independent methods for string manipulation, text comparison, and casing operations. This enables consistent behavior across cultures.

1. String Manipulation

The CultureInfo class offers methods such as ToUpper(), ToLower(), IndexOf(), etc., which perform string manipulations in a culture-independent manner. This is useful when you want consistent results regardless of the user's culture. For example:

string text = \"Äpfel und Birnen\";string upperCaseText = text.ToUpperInvariant(); // Output: ÄPFEL UND BIRNENint indexOfN = text.IndexOf('n', StringComparison.OrdinalIgnoreCase); // Output: 7 (case-insensitive search)

2. Text Comparison and Sorting

The CultureInfo class provides methods like Compare() and CompareOrdinal() that allow culture-independent comparison and sorting of text. For example:

string text1 = \"apple\";string text2 = \"Apple\";int result = string.Compare(text1, text2, StringComparison.OrdinalIgnoreCase);// Output: 0 (both strings are equal when ignoring case)string[] fruits = { \"banana\", \"apple\", \"Orange\", \"grape\" };Array.Sort(fruits, StringComparer.OrdinalIgnoreCase);// Output: [apple, banana, grape, Orange]

Conclusion

The CultureInfo class plays a vital role in developing applications that can be localized and adapted to different cultures. It allows you to format and parse strings, numbers, and dates according to specific cultural conventions, ensuring that your software is more accessible to users worldwide. By leveraging the features of the CultureInfo class, you can create inclusive and user-friendly software that respects the diversity of cultures around the globe.