Byte.TryParse Method (String, NumberStyles, IFormatProvider, Byte)

Converts the string representation of a number in a specified style and culture-specific format to its Byte equivalent. A return value indicates whether the conversion succeeded or failed.

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

public static bool TryParse (
	string s,
	NumberStyles style,
	IFormatProvider provider,
	out byte result
public static boolean TryParse (
	String s, 
	NumberStyles style, 
	IFormatProvider provider, 
	/** @attribute OutAttribute() */ /** @ref */ byte result
Not applicable.



A string containing a number to convert. The string is interpreted using the style specified by style.


A bitwise combination of NumberStyles values that indicates the style elements that can be present in s. A typical value to specify is Integer.


An IFormatProvider object that supplies culture-specific formatting information about s. If provider is a null reference (Nothing in Visual Basic), the thread current culture is used.


When this method returns, contains the 8-bit unsigned integer value equivalent to the number contained in s if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s parameter is a null reference (Nothing in Visual Basic), is not of the correct format, or represents a number less than MinValue or greater than MaxValue. This parameter is passed uninitialized.

Return Value

true if s was converted successfully; otherwise, false.

Exception typeCondition


style is not a NumberStyles value.


style is not a combination of NumberStyles.AllowHexSpecifier and NumberStyles.HexNumber values.

The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails.

The s parameter is parsed using the formatting information in a NumberFormatInfo object supplied by the provider parameter.

The style parameter defines the style elements (such as white space or the positive sign) that are allowed in the s parameter for the parse operation to succeed. It must be a combination of bit flags from the NumberStyles enumeration. Depending on the value of style, the s parameter may include the following elements:


Or, if the style parameter includes AllowHexSpecifier:


Elements in square brackets ( [ and ] ) are optional. The following table describes each element.




Optional white space. White space can appear at the beginning of s if style includes the NumberStyles.AllowLeadingWhite flag, or at the end of s if style includes the NumberStyles.AllowTrailingWhite flag.


A culture-specific currency symbol. Its position in the string is defined by the NumberFormatInfo.CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. The currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.


An optional positive sign. (The parse operation fails if a negative sign is present in s.) The sign can appear at the beginning of s if style includes the NumberStyles.AllowLeadingSign flag, or at the end of s if style includes the NumberStyles.AllowTrailingSign flag.


A sequence of digits from 0 through 9.


A culture-specific decimal point symbol. The decimal point symbol of the culture specified by provider can appear in s if style includes the NumberStyles.AllowDecimalPoint flag.


One or more occurrences of the digit 0. Fractional digits can appear in s only if style includes the NumberStyles.AllowDecimalPoint flag.


The e or E character, which indicates that the value is represented in exponential notation. The s parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag.


A sequence of hexadecimal digits from 0 through f, or 0 through F.

A string with decimal digits only (which corresponds to the NumberStyles.None style) always parses successfully. Most of the remaining NumberStyles members control elements that may be but are not required to be present in this input string. The following table indicates how individual NumberStyles members affect the elements that may be present in s.

Non-composite NumberStyles values

Elements permitted in s in addition to digits


Decimal digits only.


The . and fractional_digits elements. However, fractional_digits must consist of only one or more 0 digits or the method returns false.


The s parameter can also use exponential notation. If s represents a number in exponential notation, the exponent's sign can be present only if it is positive. In addition, s must represent an integer within the range of the Byte data type.


The ws element at the beginning of s.


The ws element at the end of s.


A positive sign can appear before digits.


A positive sign can appear after digits.


Although this flag is supported, the method returns false if parentheses are present in s.


Although the group separator symbol can appear in s, it can be preceded by only one or more 0 digits.


The $ element.

If the NumberStyles.AllowHexSpecifier flag is used, s must be a hexadecimal value. The only other flags that can be present in style are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (The NumberStyles enumeration has a composite number style, NumberStyles.HexNumber, that includes both white space flags.)

The provider parameter is an IFormatProvider implementation, such as a CultureInfo object or a NumberFormatInfo object, whose GetFormat method returns a NumberFormatInfo object. The NumberFormatInfo object provides culture-specific information about the format of s.

The following example calls the TryParse(String,NumberStyles,IFormatProvider,Byte) method with a number of different string values.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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