UInt16::Parse Method (String^, NumberStyles, IFormatProvider^)
Converts the string representation of a number in a specified style and culturespecific format to its 16bit unsigned integer equivalent.
This API is not CLScompliant.
Assembly: mscorlib (in mscorlib.dll)
public: [CLSCompliantAttribute(false)] static unsigned short Parse( String^ s, NumberStyles style, IFormatProvider^ provider )
Parameters
 s

Type:
System::String^
A string that represents the number to convert. The string is interpreted by using the style specified by the style parameter.
 style

Type:
System.Globalization::NumberStyles
A bitwise combination of enumeration values that indicate the style elements that can be present in s. A typical value to specify is NumberStyles::Integer.
 provider

Type:
System::IFormatProvider^
An object that supplies culturespecific formatting information about s.
Exception  Condition 

ArgumentNullException  s is null. 
ArgumentException  style is not a NumberStyles value. or style is not a combination of AllowHexSpecifier and HexNumber values. 
FormatException  s is not in a format compliant with style. 
OverflowException  s represents a number that is less than UInt16::MinValue or greater than UInt16::MaxValue. or s includes nonzero, fractional digits. 
The style parameter defines the style elements (such as white space or the positive or negative sign symbol) 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:
[ws][$][sign]digits[.fractional_digits][E[sign]exponential_digits][ws]
Elements in square brackets ([ and ]) are optional. If style includes NumberStyles::AllowHexSpecifier, the s parameter may include the following elements:
[ws]hexdigits[ws]
The following table describes each element.
Element  Description 

ws  Optional white space. White space can appear at the beginning of s if style includes the NumberStyles::AllowLeadingWhite flag, and it can appear at the end of s if style includes the NumberStyles::AllowTrailingWhite flag. 
$  A culturespecific currency symbol. Its position in the string is defined by the CurrencyPositivePattern property of the NumberFormatInfo object that is returned by the GetFormat method of the provider parameter. The currency symbol can appear in s if style includes the NumberStyles::AllowCurrencySymbol flag. 
sign  An optional sign. (The method throws an OverflowException if s includes a negative sign and represents a nonzero number.) The sign can appear at the beginning of s if style includes the NumberStyles::AllowLeadingSign flag, and it can appear the end of s if style includes the NumberStyles::AllowTrailingSign flag. Parentheses can be used in s to indicate a negative value if style includes the NumberStyles::AllowParentheses flag. 
digits  A sequence of digits from 0 through 9. 
.  A culturespecific decimal point symbol. The current culture's decimal point symbol can appear in s if style includes the NumberStyles::AllowDecimalPoint flag. 
fractional_digits  One or more occurrences of the digit 09 if style includes the NumberStyles::AllowExponent flag, or one or more occurrences of the digit 0 if it does not. Fractional digits can appear in s only if style includes the NumberStyles::AllowDecimalPoint flag. 
E  The "e" or "E" character, which indicates that the value is represented in exponential (scientific) notation. The s parameter can represent a number in exponential notation if style includes the NumberStyles::AllowExponent flag. 
exponential_digits  A sequence of digits from 0 through 9. The s parameter can represent a number in exponential notation if style includes the NumberStyles::AllowExponent flag. 
hexdigits  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 present, 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.
Noncomposite NumberStyles values  Elements permitted in s in addition to digits 

Decimal digits only.  
The decimal point (.) and fractional_digits elements. However, if style does not include the NumberStyles::AllowExponent flag, fractional_digits must consist of only one or more 0 digits; otherwise, an OverflowException is thrown.  
The "e" or "E" character, which indicates exponential notation, along with exponential_digits.  
The ws element at the beginning of s.  
The ws element at the end of s.  
A sign before digits.  
A sign after digits.  
Parentheses before and after digits to indicate a negative value.  
The group separator (,) element.  
The currency ($) element. 
If the NumberStyles::AllowHexSpecifier flag is used, s must be a hexadecimal value. Valid hexadecimal digits are 0 through 9, a through f, and A through F. A prefix, such as "0x", is not supported and causes the parse operation to fail. The only other flags that can be combined with NumberStyles::AllowHexSpecifier are NumberStyles::AllowLeadingWhite and NumberStyles::AllowTrailingWhite. (The NumberStyles enumeration includes a composite number style, NumberStyles::HexNumber, that includes both whitespace flags.)
Note 

If the s parameter is the string representation of a hexadecimal number, it cannot be preceded by any decoration (such as 0x or &h) that differentiates it as a hexadecimal number. This causes the parse operation to throw an exception. 
The provider parameter is an IFormatProvider implementation whose GetFormat method returns a NumberFormatInfo object that provides culturespecific information about the format of s. There are three ways to use the provider parameter to supply custom formatting information to the parse operation:
You can pass the actual NumberFormatInfo object that provides formatting information. (Its implementation of GetFormat simply returns itself.)
You can pass a CultureInfo object that specifies the culture whose formatting is to be used. Its NumberFormat property provides formatting information.
You can pass a custom IFormatProvider implementation. Its GetFormat method must instantiate and return the NumberFormatInfo object that provides formatting information.
If provider is null, the NumberFormatInfo object for the current culture is used.
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