UInt16.Parse Method (String, IFormatProvider)
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Updated: August 2009
Converts the string representation of a number in a specified culture-specific format to its 16-bit unsigned integer equivalent.
This API is not CLS-compliant. The CLS-compliant alternative is Parse(String).
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<CLSCompliantAttribute(False)> _
Public Shared Function Parse ( _
s As String, _
provider As IFormatProvider _
) As UShort
[CLSCompliantAttribute(false)]
public static ushort Parse(
string s,
IFormatProvider provider
)
Parameters
- s
Type: System.String
A string that represents the number to convert.
- provider
Type: System.IFormatProvider
An object that supplies culture-specific formatting information about s.
Return Value
Type: System.UInt16
A 16-bit unsigned integer equivalent to the number specified in s.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | s is nulla null reference (Nothing in Visual Basic). |
| FormatException | s is not in the correct format. |
| OverflowException | s represents a number less than UInt16.MinValue or greater than UInt16.MaxValue. |
Remarks
The s parameter contains a number of the form:
[ws][sign]digits[ws]
Elements in square brackets ('[' and ']') are optional. The following table describes each element.
Element |
Description |
|---|---|
ws |
Optional white space. |
sign |
An optional positive sign. |
digits |
A sequence of digits ranging from 0 to 9. |
The s parameter is interpreted using the NumberStyles.Integer style. In addition to the byte value's decimal digits, only leading and trailing spaces along with a leading sign is allowed. (If the negative sign is present, s must represent a value of zero or the method throws an OverflowException.) To explicitly define the style elements together with the culture-specific formatting information that can be present in s, use the Parse(String, NumberStyles, IFormatProvider) method.
The provider parameter is an IFormatProvider implementation whose GetFormat method returns a NumberFormatInfo object that provides culture-specific 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 nulla null reference (Nothing in Visual Basic), the NumberFormatInfo for the current culture is used.
Examples
The following example instantiates a custom culture that uses two plus signs (++) as its positive sign. It then calls the Parse(String, IFormatProvider) method to parse an array of strings by using CultureInfo objects that represent both this custom culture and the invariant culture.
Imports System.Globalization
Module Example
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim values() As String = {" 214 ", "1,064", "(0)", "1241+", " + 214 ", " +214 ", "2153.0", "1e03", "1300.0e-2"}
Dim whitespace As NumberStyles = NumberStyles.AllowLeadingWhite Or NumberStyles.AllowTrailingWhite
Dim styles() As NumberStyles = {NumberStyles.None, _
whitespace, _
NumberStyles.AllowLeadingSign Or NumberStyles.AllowTrailingSign Or whitespace, _
NumberStyles.AllowThousands Or NumberStyles.AllowCurrencySymbol, _
NumberStyles.AllowExponent Or NumberStyles.AllowDecimalPoint}
' Attempt to convert each number using each style combination.
For Each value As String In values
outputBlock.Text += String.Format("Attempting to convert '{0}':", value) & vbCrLf
For Each style As NumberStyles In styles
Try
Dim number As UShort = UInt16.Parse(value, style)
outputBlock.Text += String.Format(" {0}: {1}", style, number) & vbCrLf
Catch e As FormatException
outputBlock.Text += String.Format(" {0}: Bad Format", style) & vbCrLf
End Try
Next
outputBlock.Text &= vbCrLf
Next
End Sub
End Module
' The example displays the following output:
' Attempting to convert ' 214 ':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: 214
' Integer, AllowTrailingSign: 214
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: Bad Format
'
' Attempting to convert '1,064':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: Bad Format
' AllowThousands, AllowCurrencySymbol: 1064
' AllowDecimalPoint, AllowExponent: Bad Format
'
' Attempting to convert '(0)':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: Bad Format
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: Bad Format
'
' Attempting to convert '1241+':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: 1241
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: Bad Format
'
' Attempting to convert ' + 214 ':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: Bad Format
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: Bad Format
'
' Attempting to convert ' +214 ':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: 214
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: Bad Format
'
' Attempting to convert '2153.0':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: Bad Format
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: 2153
'
' Attempting to convert '1e03':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: Bad Format
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: 1000
'
' Attempting to convert '1300.0e-2':
' None: Bad Format
' AllowLeadingWhite, AllowTrailingWhite: Bad Format
' Integer, AllowTrailingSign: Bad Format
' AllowThousands, AllowCurrencySymbol: Bad Format
' AllowDecimalPoint, AllowExponent: 13
Imports System.Globalization
Module Example
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
' Define a custom culture that uses "++" as a positive sign.
Dim ci As CultureInfo = New CultureInfo("")
ci.NumberFormat.PositiveSign = "++"
' Create an array of cultures.
Dim cultures() As CultureInfo = {ci, CultureInfo.InvariantCulture}
' Create an array of strings to parse.
Dim values() As String = {"++1403", "-0", "+0", "+16034", _
Int16.MinValue.ToString(), "14.0", "18012"}
' Parse the strings using each culture.
For Each culture As CultureInfo In cultures
outputBlock.Text += String.Format("Parsing with the '{0}' culture.", culture.Name) & vbCrLf
For Each value As String In values
Try
Dim number As UShort = UInt16.Parse(value, culture)
outputBlock.Text += String.Format(" Converted '{0}' to {1}.", value, number) & vbCrLf
Catch e As FormatException
outputBlock.Text += String.Format(" The format of '{0}' is invalid.", value) & vbCrLf
Catch e As OverflowException
outputBlock.Text += String.Format(" '{0}' is outside the range of a UInt16 value.", value) & vbCrLf
End Try
Next
Next
End Sub
End Module
' The example displays the following output:
' Parsing with the culture.
' Converted '++1403' to 1403.
' Converted '-0' to 0.
' The format of '+0' is invalid.
' The format of '+16034' is invalid.
' '-32768' is outside the range of a UInt16 value.
' The format of '14.0' is invalid.
' Converted '18012' to 18012.
' Parsing with the '' culture.
' The format of '++1403' is invalid.
' Converted '-0' to 0.
' Converted '+0' to 0.
' Converted '+16034' to 16034.
' '-32768' is outside the range of a UInt16 value.
' The format of '14.0' is invalid.
' Converted '18012' to 18012.
using System;
using System.Globalization;
public class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
string[] values = { " 214 ", "1,064", "(0)", "1241+", " + 214 ", " +214 ", "2153.0", "1e03", "1300.0e-2" };
NumberStyles whitespace = NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite;
NumberStyles[] styles = { NumberStyles.None, whitespace,
NumberStyles.AllowLeadingSign | NumberStyles.AllowTrailingSign | whitespace,
NumberStyles.AllowThousands | NumberStyles.AllowCurrencySymbol,
NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint };
// Attempt to convert each number using each style combination.
foreach (string value in values)
{
outputBlock.Text += String.Format("Attempting to convert '{0}':", value) + "\n";
foreach (NumberStyles style in styles)
{
try
{
ushort number = UInt16.Parse(value, style);
outputBlock.Text += String.Format(" {0}: {1}", style, number) + "\n";
}
catch (FormatException)
{
outputBlock.Text += String.Format(" {0}: Bad Format", style) + "\n";
}
}
outputBlock.Text += "\n";
}
}
}
// The example display the following output:
// Attempting to convert ' 214 ':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: 214
// Integer, AllowTrailingSign: 214
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: Bad Format
//
// Attempting to convert '1,064':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: Bad Format
// AllowThousands, AllowCurrencySymbol: 1064
// AllowDecimalPoint, AllowExponent: Bad Format
//
// Attempting to convert '(0)':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: Bad Format
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: Bad Format
//
// Attempting to convert '1241+':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: 1241
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: Bad Format
//
// Attempting to convert ' + 214 ':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: Bad Format
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: Bad Format
//
// Attempting to convert ' +214 ':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: 214
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: Bad Format
//
// Attempting to convert '2153.0':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: Bad Format
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: 2153
//
// Attempting to convert '1e03':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: Bad Format
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: 1000
//
// Attempting to convert '1300.0e-2':
// None: Bad Format
// AllowLeadingWhite, AllowTrailingWhite: Bad Format
// Integer, AllowTrailingSign: Bad Format
// AllowThousands, AllowCurrencySymbol: Bad Format
// AllowDecimalPoint, AllowExponent: 13
using System;
using System.Globalization;
public class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
// Define a custom culture that uses "++" as a positive sign.
CultureInfo ci = new CultureInfo("");
ci.NumberFormat.PositiveSign = "++";
// Create an array of cultures.
CultureInfo[] cultures = { ci, CultureInfo.InvariantCulture };
// Create an array of strings to parse.
string[] values = { "++1403", "-0", "+0", "+16034",
Int16.MinValue.ToString(), "14.0", "18012" };
// Parse the strings using each culture.
foreach (CultureInfo culture in cultures)
{
outputBlock.Text += String.Format("Parsing with the '{0}' culture.", culture.Name) + "\n";
foreach (string value in values)
{
try
{
ushort number = UInt16.Parse(value, culture);
outputBlock.Text += String.Format(" Converted '{0}' to {1}.", value, number) + "\n";
}
catch (FormatException)
{
outputBlock.Text += String.Format(" The format of '{0}' is invalid.", value) + "\n";
}
catch (OverflowException)
{
outputBlock.Text += String.Format(" '{0}' is outside the range of a UInt16 value.", value) + "\n";
}
}
}
}
}
// The example displays the following output:
// Parsing with the culture.
// Converted '++1403' to 1403.
// Converted '-0' to 0.
// The format of '+0' is invalid.
// The format of '+16034' is invalid.
// '-32768' is outside the range of a UInt16 value.
// The format of '14.0' is invalid.
// Converted '18012' to 18012.
// Parsing with the '' culture.
// The format of '++1403' is invalid.
// Converted '-0' to 0.
// Converted '+0' to 0.
// Converted '+16034' to 16034.
// '-32768' is outside the range of a UInt16 value.
// The format of '14.0' is invalid.
// Converted '18012' to 18012.
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
See Also
Reference
Other Resources
Change History
Date |
History |
Reason |
|---|---|---|
August 2009 |
Revised extensively. |
Information enhancement. |