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NumberFormatInfo Class

Defines how numeric values are formatted and displayed, depending on the culture.

For a list of all members of this type, see NumberFormatInfo Members.


[Visual Basic]
NotInheritable Public Class NumberFormatInfo
   Implements ICloneable, IFormatProvider
public sealed class NumberFormatInfo : ICloneable, IFormatProvider
public __gc __sealed class NumberFormatInfo : public ICloneable,
class NumberFormatInfo implements ICloneable,

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


This class contains information, such as currency, decimal separators, and other numeric symbols.

To create a NumberFormatInfo for a specific culture, create a CultureInfo for that culture and retrieve the CultureInfo.NumberFormat property. To create a NumberFormatInfo for the culture of the current thread, use the CurrentInfo property. To create a NumberFormatInfo for the invariant culture, use the InvariantInfo property for a read-only version, or use the NumberFormatInfo constructor for a writable version. It is not possible to create a NumberFormatInfo for a neutral culture.

The user might choose to override some of the values associated with the current culture of Windows through Regional and Language Options (or Regional Options or Regional Settings) in Control Panel. For example, the user might choose to display the date in a different format or to use a currency other than the default for the culture. If the CultureInfo.UseUserOverride property is set to true, the properties of the CultureInfo.DateTimeFormat instance, the CultureInfo.NumberFormat instance, and the CultureInfo.TextInfo instance are also retrieved from the user settings. If the user settings are incompatible with the culture associated with the CultureInfo (for example, if the selected calendar is not one of the OptionalCalendars), the results of the methods and the values of the properties are undefined.

Numeric values are formatted using standard or custom patterns stored in the properties of a NumberFormatInfo. To modify how a value is displayed, the NumberFormatInfo must be writable so custom patterns can be saved in its properties.

The following table lists the standard format characters for each standard pattern and the associated NumberFormatInfo property that can be set to modify the standard pattern.

Format Character Description and Associated Properties
c, C Currency format. CurrencyNegativePattern, CurrencyPositivePattern, CurrencySymbol, CurrencyGroupSizes, CurrencyGroupSeparator, CurrencyDecimalDigits, CurrencyDecimalSeparator.
d, D Decimal format.
e, E Scientific (exponential) format.
f, F Fixed-point format.
g, G General format.
n, N Number format. NumberNegativePattern, NumberGroupSizes, NumberGroupSeparator, NumberDecimalDigits, NumberDecimalSeparator.
r, R Roundtrip format, which ensures that numbers converted to strings will have the same value when they are converted back to numbers.
x, X Hexadecimal format.

A DateTimeFormatInfo or a NumberFormatInfo can be created only for the invariant culture or for specific cultures, not for neutral cultures. For more information about the invariant culture, specific cultures, and neutral cultures, see the CultureInfo class.

This class implements the ICloneable interface to enable duplication of NumberFormatInfo objects. It also implements IFormatProvider to supply formatting information to applications.


Namespace: System.Globalization

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

Assembly: Mscorlib (in Mscorlib.dll)

See Also

NumberFormatInfo Members | System.Globalization Namespace | Decimal | CultureInfo | Formatting Overview