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Convert.ToSingle Method (String)

Converts the specified string representation of a number to an equivalent single-precision floating-point number.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Shared Function ToSingle ( _
	value As String _
) As Single

Parameters

value
Type: System.String

A string that contains the number to convert.

Return Value

Type: System.Single
A single-precision floating-point number that is equivalent to the number in value, or 0 (zero) if value is Nothing.

ExceptionCondition
FormatException

value is not a number in a valid format.

OverflowException

value represents a number that is less than Single.MinValue or greater than Single.MaxValue.

Using the ToSingle(String) method is equivalent to passing value to the Single.Parse(String) method. value is interpreted by using the formatting conventions of the current thread culture.

If you prefer not to handle an exception if the conversion fails, you can call the Single.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

The following example attempts to convert each element in an array of numeric strings to a Single value.

Dim values() As String = { "-1,035.77219", "1AFF", "1e-35", "1.63f",
                           "1,635,592,999,999,999,999,999,999", "-17.455",
                           "190.34001", "1.29e325"}
Dim result As Single 

For Each value As String In values
   Try
      result = Convert.ToSingle(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As FormatException
      Console.WriteLine("Unable to convert '{0}' to a Single.", value)            
   Catch e As OverflowException
      Console.WriteLine("'{0}' is outside the range of a Single.", value)
   End Try 
Next        
' The example displays the following output: 
'    Converted the String value '-1,035.77219' to the Single value -1035.772. 
'    Unable to convert '1AFF' to a Single. 
'    Converted the String value '1e-35' to the Single value 1E-35. 
'    Unable to convert '1.63f' to a Single. 
'    Converted the String value '1,635,592,999,999,999,999,999,999' to the Single value 1.635593E+24. 
'    Converted the String value '-17.455' to the Single value -17.455. 
'    Converted the String value '190.34001' to the Single value 190.34. 
'    '1.29e325' is outside the range of a Single.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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