Single.ToString Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Converts the numeric value of this instance to its equivalent string representation.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
Public Overrides Function ToString As String
public override string ToString()
Return Value
Type: System..::.String
The string representation of the value of this instance.
Remarks
The return value can be PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol, or a string of the form:
[sign]integral-digits[.[fractional-digits]][e[sign]exponential-digits]
Optional elements are framed in square brackets ([ and ]). Elements that contain the term "digits" consist of a series of numeric characters ranging from 0 to 9. The following table describes each element.
Element |
Description |
|---|---|
sign |
A negative sign or positive sign symbol. |
integral-digits |
A series of digits specifying the integral part of the number. Integral-digits can be absent if there are fractional-digits. |
'.' |
A culture-specific decimal point symbol. |
fractional-digits |
A series of digits specifying the fractional part of the number. |
'e' |
A lowercase character 'e', indicating exponential (scientific) notation. |
exponential-digits |
A series of digits specifying an exponent. |
Some examples of the return value are "100", "-123,456,789", "123.45e+6", "500", "3.1416", "600", "-0.123", and "-Infinity".
This overload of the ToString method implicitly uses the general numeric format specifier ("G") and the NumberFormatInfo object for the current culture.
Examples
The following example uses the default Single..::.ToString method to display the string representations of a number of Single values.
' Example for the Single.ToString( ) methods.
Imports System.Globalization
Module Example
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim singleValue As Single = 11876.54321
Dim format As String = " {0,-30}{1}"
outputBlock.Text &= String.Format("This example of" & vbCrLf & _
" Single.ToString( ), " & vbCrLf & _
" Single.ToString( String )," & vbCrLf & _
" Single.ToString( IFormatProvider ), and " & vbCrLf & _
" Single.ToString( String, IFormatProvider )" & _
vbCrLf & "generates the following output when run in " & _
"the [{0}] culture. " & vbCrLf & "A Single number is " & _
"formatted with various combinations of format " & _
"" & vbCrLf & "strings and IFormatProvider.", _
CultureInfo.CurrentCulture.Name) & vbCrLf
' Format the number without and with format strings.
outputBlock.Text &= String.Format(vbCrLf & "IFormatProvider is not " & _
"used; the default culture is [{0}]:", _
CultureInfo.CurrentCulture.Name) & vbCrLf
outputBlock.Text &= String.Format(format, _
"No format string:", singleValue.ToString()) & vbCrLf
outputBlock.Text &= String.Format(format, _
"'N5' format string:", singleValue.ToString("N5")) & vbCrLf
outputBlock.Text &= String.Format(format, _
"'E' format string:", singleValue.ToString("E")) & vbCrLf
outputBlock.Text &= String.Format(format, _
"'E5' format string:", singleValue.ToString("E5")) & vbCrLf
' Create a CultureInfo object for another culture. Use
' [Dutch - The Netherlands] unless the current culture
' is Dutch language. In that case use [English - U.S.].
Dim cultureName As String = IIf( _
CultureInfo.CurrentCulture.Name.Substring(0, 2) = _
"nl", "en-US", "nl-NL")
Dim culture As New CultureInfo(cultureName)
' Use the CultureInfo object for an IFormatProvider.
outputBlock.Text &= String.Format(vbCrLf & "A CultureInfo object " & _
"for [{0}] is used for the IFormatProvider: ", _
cultureName) & vbCrLf
outputBlock.Text &= String.Format(format, "No format string:", _
singleValue.ToString(culture)) & vbCrLf
outputBlock.Text &= String.Format(format, "'N5' format string:", _
singleValue.ToString("N5", culture)) & vbCrLf
outputBlock.Text &= String.Format(format, "'E' format string:", _
singleValue.ToString("E", culture)) & vbCrLf
' Get the NumberFormatInfo object from CultureInfo, and
' then change the digit group size to 2 and the digit
' separator to '_'.
Dim numInfo As NumberFormatInfo = culture.NumberFormat
numInfo.NumberGroupSizes = New Integer() {2}
numInfo.NumberGroupSeparator = "_"
' Use a NumberFormatInfo object for IFormatProvider.
outputBlock.Text &= String.Format(vbCrLf & _
"A NumberFormatInfo object with digit group " & _
"size = 2 and " & vbCrLf & "digit separator " & _
"= '_' is used for the IFormatProvider:") & vbCrLf
outputBlock.Text &= String.Format(format, "'N' format string:", _
singleValue.ToString("N", culture)) & vbCrLf
outputBlock.Text &= String.Format(format, "'E' format string:", _
singleValue.ToString("E", culture)) & vbCrLf
End Sub
End Module
' This example of
' Single.ToString( ),
' Single.ToString( String ),
' Single.ToString( IFormatProvider ), and
' Single.ToString( String, IFormatProvider )
' generates the following output when run in the [en-US] culture.
' A Single number is formatted with various combinations of format
' strings and IFormatProvider.
'
' IFormatProvider is not used; the default culture is [en-US]:
' No format string: 11876.54
' 'N5' format string: 11,876.54000
' 'E' format string: 1.187654E+004
' 'E5' format string: 1.18765E+004
'
' A CultureInfo object for [nl-NL] is used for the IFormatProvider:
' No format string: 11876,54
' 'N5' format string: 11.876,54000
' 'E' format string: 1,187654E+004
'
' A NumberFormatInfo object with digit group size = 2 and
' digit separator = '_' is used for the IFormatProvider:
' 'N' format string: 1_18_76,54
' 'E' format string: 1,187654E+004
// Example for the Single.ToString( ) methods.
using System;
using System.Globalization;
class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
float singleValue = 11876.54321F;
string format = " {0,-30}{1}";
outputBlock.Text += String.Format("This example of\n" +
" Single.ToString( ), \n" +
" Single.ToString( String ),\n" +
" Single.ToString( IFormatProvider ), and \n" +
" Single.ToString( String, IFormatProvider )\n" +
"generates the following output when run in the [{0}] " +
"culture. \nA Single number is formatted with various " +
"combinations of format \nstrings and IFormatProvider.",
CultureInfo.CurrentCulture.Name) + "\n";
// Format the number without and with format strings.
outputBlock.Text += String.Format("\nIFormatProvider is not " +
"used; the default culture is [{0}]:",
CultureInfo.CurrentCulture.Name) + "\n";
outputBlock.Text += String.Format(format, "No format string:",
singleValue.ToString()) + "\n";
outputBlock.Text += String.Format(format, "'N5' format string:",
singleValue.ToString("N5")) + "\n";
outputBlock.Text += String.Format(format, "'E' format string:",
singleValue.ToString("E")) + "\n";
outputBlock.Text += String.Format(format, "'E5' format string:",
singleValue.ToString("E5")) + "\n";
// Create a CultureInfo object for another culture. Use
// [Dutch - The Netherlands] unless the current culture
// is Dutch language. In that case use [English - U.S.].
string cultureName =
CultureInfo.CurrentCulture.Name.Substring(0, 2) == "nl" ?
"en-US" : "nl-NL";
CultureInfo culture = new CultureInfo(cultureName);
// Use the CultureInfo object for an IFormatProvider.
outputBlock.Text += String.Format("\nA CultureInfo object " +
"for [{0}] is used for the IFormatProvider: ",
cultureName) + "\n";
outputBlock.Text += String.Format(format, "No format string:",
singleValue.ToString(culture)) + "\n";
outputBlock.Text += String.Format(format, "'N5' format string:",
singleValue.ToString("N5", culture)) + "\n";
outputBlock.Text += String.Format(format, "'E' format string:",
singleValue.ToString("E", culture)) + "\n";
// Get the NumberFormatInfo object from CultureInfo, and
// then change the digit group size to 2 and the digit
// separator to '_'.
NumberFormatInfo numInfo = culture.NumberFormat;
numInfo.NumberGroupSizes = new int[] { 2 };
numInfo.NumberGroupSeparator = "_";
// Use a NumberFormatInfo object for IFormatProvider.
outputBlock.Text += String.Format("\nA NumberFormatInfo object with digit " +
"group size = 2 and \ndigit separator = '_' is used " +
"for the IFormatProvider:") + "\n";
outputBlock.Text += String.Format(format, "'N' format string:",
singleValue.ToString("N", culture)) + "\n";
outputBlock.Text += String.Format(format, "'E' format string:",
singleValue.ToString("E", culture)) + "\n";
}
}
/*
This example of
Single.ToString( ),
Single.ToString( String ),
Single.ToString( IFormatProvider ), and
Single.ToString( String, IFormatProvider )
generates the following output when run in the [en-US] culture.
A Single number is formatted with various combinations of format
strings and IFormatProvider.
IFormatProvider is not used; the default culture is [en-US]:
No format string: 11876.54
'N5' format string: 11,876.54000
'E' format string: 1.187654E+004
'E5' format string: 1.18765E+004
A CultureInfo object for [nl-NL] is used for the IFormatProvider:
No format string: 11876,54
'N5' format string: 11.876,54000
'E' format string: 1,187654E+004
A NumberFormatInfo object with digit group size = 2 and
digit separator = '_' is used for the IFormatProvider:
'N' format string: 1_18_76,54
'E' format string: 1,187654E+004
*/
The following code example illustrates the use of the Parse(String) method along with the ToString()()() method.
Dim Done As Boolean = False
Dim Inp As String
Do
outputBlock.Text &= "Enter a real number: "
Inp = Console.ReadLine()
Try
S = Single.Parse(Inp)
outputBlock.Text &= "You entered " + S.ToString() + "." & vbCrLf
Done = True
Catch E As FormatException
outputBlock.Text &= "You did not enter a number." & vbCrLf
Catch E As Exception
outputBlock.Text &= "An exception occurred while parsing your response: " + E.ToString() & vbCrLf
End Try
Loop While Not Done
bool done = false;
string inp;
do
{
outputBlock.Text += "Enter a real number: ";
inp = Console.ReadLine();
try
{
s = Single.Parse(inp);
outputBlock.Text += String.Format("You entered {0}.", s.ToString()) + "\n";
done = true;
}
catch (FormatException)
{
outputBlock.Text += "You did not enter a number." + "\n";
}
catch (Exception e)
{
outputBlock.Text += String.Format("An exception occurred while parsing your response: {0}", e.ToString()) + "\n";
}
} while (!done);
Version Information
Windows Phone OS
Supported in: 8.1, 8.0, 7.1, 7.0
Platforms
Windows Phone