Single::Parse Method (String, NumberStyles)
Converts the string representation of a number in a specified style to its single-precision floating-point number equivalent.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- s
- Type: System::String
A string that contains a number to convert.
- style
- Type: System.Globalization::NumberStyles
A bitwise combination of enumeration values that indicates the style elements that can be present in s. A typical value to specify is Float combined with AllowThousands.
Return Value
Type: System::SingleA single-precision floating-point number that is equivalent to the numeric value or symbol specified in s.
| Exception | Condition |
|---|---|
| ArgumentNullException | s is nullptr. |
| FormatException | s is not a number in a valid format. |
| OverflowException | s represents a number that is less than MinValue or greater than MaxValue. |
| ArgumentException | style is not a NumberStyles value. -or- style includes the AllowHexSpecifier value. |
The style parameter defines the style elements (such as white space, thousands separators, and currency symbols) 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. The following NumberStyles members are not supported:
The s parameter can contain the current culture's PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol. Depending on the value of style, it can also take the form:
[ws][$][sign][integral-digits[,]]integral-digits[.[fractional-digits]][E[sign]exponential-digits][ws]
Elements in square brackets ([ and ]) are optional. The following table describes each element.
A string with digits only (which corresponds to the NumberStyles::None style) always parses successfully. The remaining System.Globalization::NumberStyles members control elements that may be present, but are not required to be present, in the input string. The following table indicates how individual NumberStyles flags affect the elements that may be present in s.
NumberStyles value | Elements permitted in s in addition to digits |
|---|---|
The integral-digits element only. | |
The decimal point (.) and fractional-digits elements. | |
The "e" or "E" character, which indicates exponential notation. This flag by itself supports values in the form digitsEdigits; additional flags are needed to successfully parse strings with such elements as positive or negative signs and decimal point symbols. | |
The ws element at the beginning of s. | |
The ws element at the end of s. | |
The sign element at the beginning of s. | |
The sign element at the end of s. | |
The sign element in the form of parentheses enclosing the numeric value. | |
The thousands separator (,) element. | |
The currency ($) element. | |
All elements. However, s cannot represent a hexadecimal number or a number in exponential notation. | |
The ws element at the beginning or end of s, sign at the beginning of s, and the decimal point (.) symbol. The s parameter can also use exponential notation. | |
The ws, sign, thousands separator (,) and decimal point (.) elements. | |
All elements. However, s cannot represent a hexadecimal number. |
Some examples of s are "100", "-123,456,789", "123.45e+6", "+500", "5e2", "3.1416", "600.", "-.123", and "-Infinity".
The s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. To specify the culture whose formatting information is used for the parse operation, call the Parse(String, NumberStyles, IFormatProvider) overload.
Ordinarily, if you pass the Parse method a string that is created by calling the ToString method, the original Single value is returned. However, because of a loss of precision, the values may not be equal.
If a separator is encountered in the s parameter during a parse operation, and the applicable currency or number decimal and group separators are the same, the parse operation assumes that the separator is a decimal separator rather than a group separator. For more information about separators, see CurrencyDecimalSeparator, NumberDecimalSeparator, CurrencyGroupSeparator, and NumberGroupSeparator.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.