Convert.ToString Method (Double, IFormatProvider)
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Converts the value of the specified double-precision floating point number to its equivalent String representation.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function ToString ( _
value As Double, _
provider As IFormatProvider _
) As String
public static string ToString(
double value,
IFormatProvider provider
)
Parameters
- value
Type: System.Double
A double-precision floating point number.
- provider
Type: System.IFormatProvider
An IFormatProvider interface implementation that supplies culture-specific formatting information.
Return Value
Type: System.String
The String equivalent of the value of value.
provider is ignored; it does not participate in this operation.
Examples
The following code example converts a Double value to a String with the ToString method, using an IFormatProvider object.
' Example of the Convert.ToString( numeric types ) and
' Convert.ToString( numeric types, IFormatProvider ) methods.
Imports System.Globalization
Module Example
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()
Dim formatter As String = "{0,22} {1}"
' These properties will affect the conversion.
provider.NegativeSign = "minus "
provider.NumberDecimalSeparator = " point "
' These properties will not be applied.
provider.NumberDecimalDigits = 2
provider.NumberGroupSeparator = "."
provider.NumberGroupSizes = New Integer() {3}
' Convert these values using default values and the
' format provider created above.
Dim ByteA As Byte = 140
Dim SByteA As SByte = Convert.ToSByte(-60)
Dim UInt16A As UInt16 = Convert.ToUInt16(61680)
Dim Int16A As Short = -3855
Dim UInt32A As UInt32 = Convert.ToUInt32(4042322160)
Dim Int32A As Integer = -252645135
Dim UInt64A As UInt64 = _
Convert.ToUInt64(8138269444283625712)
Dim Int64A As Long = -1085102592571150095
Dim SingleA As Single = -32.375F
Dim DoubleA As Double = 61680.3855
Dim DecimA As Decimal = 4042322160.252645135D
Dim ObjDouble As Object = CType(-98765.4321, Object)
outputBlock.Text &= "This example of " & _
"Convert.ToString( numeric types ) and " & vbCrLf & _
"Convert.ToString( numeric types, IFormatProvider ) " & _
vbCrLf & "converts values of each of the CLR base " & _
"numeric types to strings, " & vbCrLf & "using " & _
"default formatting and a NumberFormatInfo object." & vbCrLf
outputBlock.Text &= vbCrLf & _
"Note: Of the several NumberFormatInfo properties " & _
"that are changed, " & vbCrLf & "only the negative " & _
"sign and decimal separator affect the conversions." & vbCrLf
outputBlock.Text &= String.Format(vbCrLf & formatter, _
"Default", "Format Provider") & vbCrLf
outputBlock.Text &= String.Format(formatter, _
"-------", "---------------") & vbCrLf
' Convert the values with and without a format provider.
outputBlock.Text &= String.Format(formatter, Convert.ToString(ByteA) & vbCrLf, _
Convert.ToString(ByteA, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(SByteA) & vbCrLf, _
Convert.ToString(SByteA, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(UInt16A) & vbCrLf, _
Convert.ToString(UInt16A, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(Int16A) & vbCrLf, _
Convert.ToString(Int16A, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(UInt32A) & vbCrLf, _
Convert.ToString(UInt32A, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(Int32A) & vbCrLf, _
Convert.ToString(Int32A, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(UInt64A) & vbCrLf, _
Convert.ToString(UInt64A, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(Int64A) & vbCrLf, _
Convert.ToString(Int64A, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(SingleA) & vbCrLf, _
Convert.ToString(SingleA, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(DoubleA) & vbCrLf, _
Convert.ToString(DoubleA, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(DecimA) & vbCrLf, _
Convert.ToString(DecimA, provider))
outputBlock.Text &= String.Format(formatter, Convert.ToString(ObjDouble) & vbCrLf, _
Convert.ToString(ObjDouble, provider))
End Sub
End Module
' This example of Convert.ToString( numeric types ) and
' Convert.ToString( numeric types, IFormatProvider )
' converts values of each of the CLR base numeric types to strings,
' using default formatting and a NumberFormatInfo object.
'
' Note: Of the several NumberFormatInfo properties that are changed,
' only the negative sign and decimal separator affect the conversions.
'
' Default Format Provider
' ------- ---------------
' 140 140
' -60 minus 60
' 61680 61680
' -3855 minus 3855
' 4042322160 4042322160
' -252645135 minus 252645135
' 8138269444283625712 8138269444283625712
' -1085102592571150095 minus 1085102592571150095
' -32.375 minus 32 point 375
' 61680.3855 61680 point 3855
' 4042322160.252645135 4042322160 point 252645135
' -98765.4321 minus 98765 point 4321
// Example of the Convert.ToString( numeric types ) and
// Convert.ToString( numeric types, IFormatProvider ) methods.
using System;
using System.Globalization;
class Example
{
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();
string formatter = "{0,22} {1}";
// These properties will affect the conversion.
provider.NegativeSign = "minus ";
provider.NumberDecimalSeparator = " point ";
// These properties will not be applied.
provider.NumberDecimalDigits = 2;
provider.NumberGroupSeparator = ".";
provider.NumberGroupSizes = new int[] { 3 };
// Convert these values using default values and the
// format provider created above.
byte ByteA = 140;
SByte SByteA = -60;
UInt16 UInt16A = 61680;
short Int16A = -3855;
UInt32 UInt32A = 4042322160;
int Int32A = -252645135;
UInt64 UInt64A = 8138269444283625712;
long Int64A = -1085102592571150095;
float SingleA = -32.375F;
double DoubleA = 61680.3855;
decimal DecimA = 4042322160.252645135M;
object ObjDouble = (object)(-98765.4321);
outputBlock.Text += "This example of " +
"Convert.ToString( numeric types ) and \n" +
"Convert.ToString( numeric types, IFormatProvider ) \n" +
"converts values of each of the CLR base numeric types " +
"to strings, \nusing default formatting and a " +
"NumberFormatInfo object." + "\n";
outputBlock.Text +=
"\nNote: Of the several NumberFormatInfo " +
"properties that are changed, \nonly the negative sign " +
"and decimal separator affect the conversions.\n" + "\n";
outputBlock.Text += String.Format(formatter, "Default", "Format Provider") + "\n";
outputBlock.Text += String.Format(formatter, "-------", "---------------") + "\n";
// Convert the values with and without a format provider.
outputBlock.Text += String.Format(formatter, Convert.ToString(ByteA),
Convert.ToString(ByteA, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(SByteA),
Convert.ToString(SByteA, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(UInt16A),
Convert.ToString(UInt16A, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(Int16A),
Convert.ToString(Int16A, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(UInt32A),
Convert.ToString(UInt32A, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(Int32A),
Convert.ToString(Int32A, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(UInt64A),
Convert.ToString(UInt64A, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(Int64A),
Convert.ToString(Int64A, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(SingleA),
Convert.ToString(SingleA, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(DoubleA),
Convert.ToString(DoubleA, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(DecimA),
Convert.ToString(DecimA, provider)) + "\n";
outputBlock.Text += String.Format(formatter, Convert.ToString(ObjDouble),
Convert.ToString(ObjDouble, provider)) + "\n";
}
}
/*
This example of Convert.ToString( numeric types ) and
Convert.ToString( numeric types, IFormatProvider )
converts values of each of the CLR base numeric types to strings,
using default formatting and a NumberFormatInfo object.
Note: Of the several NumberFormatInfo properties that are changed,
only the negative sign and decimal separator affect the conversions.
Default Format Provider
------- ---------------
140 140
-60 minus 60
61680 61680
-3855 minus 3855
4042322160 4042322160
-252645135 minus 252645135
8138269444283625712 8138269444283625712
-1085102592571150095 minus 1085102592571150095
-32.375 minus 32 point 375
61680.3855 61680 point 3855
4042322160.252645135 4042322160 point 252645135
-98765.4321 minus 98765 point 4321
*/
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.