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Convert.ToSingle Method (String)

Updated: May 2009

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

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

public static float ToSingle(
	string value
)

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 null.

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.

The return value is the result of invoking the Single.Parse method on value.

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.

string[] values= { "-1,035.77219", "1AFF", "1e-35", 
                   "1,635,592,999,999,999,999,999,999", "-17.455", 
                   "190.34001", "1.29e325"};
float result;

foreach (string value 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 (FormatException) {
      Console.WriteLine("Unable to convert '{0}' to a Single.", value);
   }               
   catch (OverflowException) {
      Console.WriteLine("'{0}' is outside the range of a Single.", value);
   }
}       
// 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. 
//    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.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

May 2009

Expanded the Remarks section.

Customer feedback.

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