Convert.ToSingle Method (String)
Converts the specified string representation of a number to an equivalent single-precision floating-point number.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
-
Type:
System.String
A string that contains the number to convert.
Return Value
Type: System.SingleA single-precision floating-point number that is equivalent to the number in value, or 0 (zero) if value is null.
| Exception | Condition |
|---|---|
| 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.
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1