Double.ToString Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Converts the numeric value of this instance to its equivalent string representation.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Overrides Function ToString As String
[SecuritySafeCriticalAttribute]
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 containing the term "digits" consist of a series of numeric characters ranging from 0 to 9. The elements listed in the following table are supported:
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 version of the ToString method implicitly uses the general numeric format specifier ("G") and the NumberFormatInfo for the current culture.
The .NET Framework provides extensive formatting support, which is described in greater detail in the following formatting topics:
For more information about numeric format specifiers, see Standard Numeric Format Strings and Custom Numeric Format Strings.
For more information about formatting, see Formatting Types.
Platform Notes
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Silverlight for Windows Phone
ToString does not return the correct string containing comma delimiters between group digits when a custom format is used.
Examples
The following example uses the default Double.ToString() method to display the string representations of a number of Double values.
Dim number As Double
number = 1.6E+20
' Displays 1.6E+20.
outputBlock.Text &= number.ToString() & vbCrLf
number = 160.0
' Displays 160.
outputBlock.Text &= number.ToString() & vbCrLf
number = -3.541
' Displays -3.541.
outputBlock.Text &= number.ToString() & vbCrLf
number = -150234.5222199
' Displays -150234.5222199.
outputBlock.Text &= number.ToString() & vbCrLf
number = -15023452221.9902
' Displays -15023452221.9902.
outputBlock.Text &= number.ToString() & vbCrLf
number = 0.60344
' Displays 0.60344.
outputBlock.Text &= number.ToString() & vbCrLf
number = 0.000000001
' Displays 1E-09.
outputBlock.Text &= number.ToString() & vbCrLf
double number;
number = 1.6E20;
// Displays 1.6E+20.
outputBlock.Text += number.ToString() + "\n";
number = 1.6E2;
// Displays 160.
outputBlock.Text += number.ToString() + "\n";
number = -3.541;
// Displays -3.541.
outputBlock.Text += number.ToString() + "\n";
number = -1502345222199E-07;
// Displays -150234.5222199.
outputBlock.Text += number.ToString() + "\n";
number = -15023452221990199574E-09;
// Displays -15023452221.9902.
outputBlock.Text += number.ToString() + "\n";
number = .60344;
// Displays 0.60344.
outputBlock.Text += number.ToString() + "\n";
number = .000000001;
// Displays 1E-09.
outputBlock.Text += number.ToString() + "\n";
The following example illustrates the use of ToString.
Dim Done As Boolean = False
Dim Inp As String
Do
outputBlock.Text &= "Enter a real number: "
Inp = Console.ReadLine()
Try
D = Double.Parse(Inp)
outputBlock.Text &= "You entered " + D.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
{
d = Double.Parse(inp);
outputBlock.Text += String.Format("You entered {0}.", d.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
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