Convert.ToUInt16 Method (String)
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Converts the specified String representation of a number to an equivalent 16-bit unsigned integer.
This API is not CLS-compliant.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<CLSCompliantAttribute(False)> _
Public Shared Function ToUInt16 ( _
value As String _
) As UShort
[CLSCompliantAttribute(false)]
public static ushort ToUInt16(
string value
)
Parameters
- value
Type: System.String
A String containing a number to convert.
Return Value
Type: System.UInt16
A 16-bit unsigned integer equivalent to the value of value.
-or-
Zero if value is nulla null reference (Nothing in Visual Basic).
Exceptions
| Exception | Condition |
|---|---|
| FormatException | value does not consist of an optional sign followed by a sequence of digits (zero through nine). |
| OverflowException | value represents a number less than MinValue or greater than MaxValue. |
Remarks
The return value is the result of invoking UInt16.Parse on value.
If you prefer not to handle an exception if the conversion fails, you can call the UInt16.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.
Examples
The following code example converts String representations of 16-bit unsigned integers with the ToUInt16 method, using default formatting.
' Example of the Convert.ToUInt16( String ) and
' Convert.ToUInt16( String, IFormatProvider ) methods.
Imports System.Globalization
Module Example
Dim format As String = "{0,-20}{1,-20}{2}"
' Get the exception type name; remove the namespace prefix.
Function GetExceptionType(ByVal ex As Exception) As String
Dim exceptionType As String = ex.GetType().ToString()
Return exceptionType.Substring( _
exceptionType.LastIndexOf("."c) + 1)
End Function
Sub ConvertToUInt16(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal numericStr As String, _
ByVal provider As IFormatProvider)
Dim defaultValue As Object
Dim providerValue As Object
' Convert numericStr to UInt16 without a format provider.
Try
defaultValue = Convert.ToUInt16(numericStr)
Catch ex As Exception
defaultValue = GetExceptionType(ex)
End Try
' Convert numericStr to UInt16 with a format provider.
Try
providerValue = Convert.ToUInt16(numericStr, provider)
Catch ex As Exception
providerValue = GetExceptionType(ex)
End Try
outputBlock.Text &= String.Format(format, numericStr, _
defaultValue, providerValue) & vbCrLf
End Sub
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
' Create a NumberFormatInfo object and set several of its
' properties that apply to numbers.
Dim provider As NumberFormatInfo = New NumberFormatInfo()
' These properties affect the conversion.
provider.PositiveSign = "pos "
provider.NegativeSign = "neg "
' These properties do not affect the conversion.
' The input string cannot have decimal and group separators.
provider.NumberDecimalSeparator = "."
provider.NumberGroupSeparator = ","
provider.NumberGroupSizes = New Integer() {3}
outputBlock.Text &= String.Format("This example of" & vbCrLf & _
" Convert.ToUInt16( String ) and " & vbCrLf & _
" Convert.ToUInt16( String, IFormatProvider ) " & _
vbCrLf & "generates the following output. It " & _
"converts several strings to unsigned " & vbCrLf & _
"Short values, using default " & _
"formatting or a NumberFormatInfo object." & vbCrLf) & vbCrLf
outputBlock.Text &= String.Format(format, "String to convert", _
"Default/exception", "Provider/exception") & vbCrLf
outputBlock.Text &= String.Format(format, "-----------------", _
"-----------------", "------------------") & vbCrLf
' Convert strings, with and without an IFormatProvider.
ConvertToUInt16(outputBlock, "34567", provider)
ConvertToUInt16(outputBlock, "+34567", provider)
ConvertToUInt16(outputBlock, "pos 34567", provider)
ConvertToUInt16(outputBlock, "34567.", provider)
ConvertToUInt16(outputBlock, "34,567", provider)
ConvertToUInt16(outputBlock, "65535", provider)
ConvertToUInt16(outputBlock, "65536", provider)
ConvertToUInt16(outputBlock, "-1", provider)
End Sub
End Module
' This example of
' Convert.ToUInt16( String ) and
' Convert.ToUInt16( String, IFormatProvider )
' generates the following output. It converts several strings to unsigned
' Short values, using default formatting or a NumberFormatInfo object.
'
' String to convert Default/exception Provider/exception
' ----------------- ----------------- ------------------
' 34567 34567 34567
' +34567 34567 FormatException
' pos 34567 FormatException 34567
' 34567. FormatException FormatException
' 34,567 FormatException FormatException
' 65535 65535 65535
' 65536 OverflowException OverflowException
' -1 OverflowException FormatException
// Example of the Convert.ToUInt16( string ) and
// Convert.ToUInt16( string, IFormatProvider ) methods.
using System;
using System.Globalization;
class Example
{
static string format = "{0,-20}{1,-20}{2}";
// Get the exception type name; remove the namespace prefix.
static string GetExceptionType(Exception ex)
{
string exceptionType = ex.GetType().ToString();
return exceptionType.Substring(
exceptionType.LastIndexOf('.') + 1);
}
static void ConvertToUInt16(System.Windows.Controls.TextBlock outputBlock, string numericStr,
IFormatProvider provider)
{
object defaultValue;
object providerValue;
// Convert numericStr to UInt16 without a format provider.
try
{
defaultValue = Convert.ToUInt16(numericStr);
}
catch (Exception ex)
{
defaultValue = GetExceptionType(ex);
}
// Convert numericStr to UInt16 with a format provider.
try
{
providerValue = Convert.ToUInt16(numericStr, provider);
}
catch (Exception ex)
{
providerValue = GetExceptionType(ex);
}
outputBlock.Text += String.Format(format, numericStr,
defaultValue, providerValue) + "\n";
}
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
// Create a NumberFormatInfo object and set several of its
// properties that apply to numbers.
NumberFormatInfo provider = new NumberFormatInfo();
// These properties affect the conversion.
provider.NegativeSign = "neg ";
provider.PositiveSign = "pos ";
// These properties do not affect the conversion.
// The input string cannot have decimal and group separators.
provider.NumberDecimalSeparator = ".";
provider.NumberGroupSeparator = ",";
provider.NumberGroupSizes = new int[] { 3 };
outputBlock.Text += String.Format("This example of\n" +
" Convert.ToUInt16( string ) and \n" +
" Convert.ToUInt16( string, IFormatProvider ) " +
"\ngenerates the following output. It converts " +
"several strings to \nushort values, using " +
"default formatting or a NumberFormatInfo object.\n") + "\n";
outputBlock.Text += String.Format(format, "String to convert",
"Default/exception", "Provider/exception") + "\n";
outputBlock.Text += String.Format(format, "-----------------",
"-----------------", "------------------") + "\n";
// Convert strings, with and without an IFormatProvider.
ConvertToUInt16(outputBlock, "34567", provider);
ConvertToUInt16(outputBlock, "+34567", provider);
ConvertToUInt16(outputBlock, "pos 34567", provider);
ConvertToUInt16(outputBlock, "34567.", provider);
ConvertToUInt16(outputBlock, "34,567", provider);
ConvertToUInt16(outputBlock, "65535", provider);
ConvertToUInt16(outputBlock, "65536", provider);
ConvertToUInt16(outputBlock, "-1", provider);
}
}
/*
This example of
Convert.ToUInt16( string ) and
Convert.ToUInt16( string, IFormatProvider )
generates the following output. It converts several strings to
ushort values, using default formatting or a NumberFormatInfo object.
String to convert Default/exception Provider/exception
----------------- ----------------- ------------------
34567 34567 34567
+34567 34567 FormatException
pos 34567 FormatException 34567
34567. FormatException FormatException
34,567 FormatException FormatException
65535 65535 65535
65536 OverflowException OverflowException
-1 OverflowException FormatException
*/
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.