Double.Parse Method (String, IFormatProvider)

Parameters

• s
  Type: System.String
  A string that contains a number to convert.

• provider
  Type: System.IFormatProvider
  An object that supplies culture-specific formatting information about s.

Return Value

Type: System.Double
A double-precision floating-point number that is equivalent to the numeric value or symbol specified in s.

Dim value As String

value = Double.MinValue.ToString()
Try
   outputBlock.Text += Double.Parse(value).ToString() + vbCrLf
Catch e As OverflowException
   outputBlock.Text += String.Format("{0} is outside the range of the Double type.", _
                                     value) + vbCrLf
End Try

value = Double.MaxValue.ToString()
Try
   outputBlock.Text += Double.Parse(value).ToString() + vbCrLf
Catch e As OverflowException
   outputBlock.Text += String.Format("{0} is outside the range of the Double type.", _
                                     value) + vbCrLf
End Try
' The example displays the following output:
'    -1.79769313486232E+308 is outside the range of the Double type.
'    1.79769313486232E+308 is outside the range of the Double type.            

   string value;

   value = Double.MinValue.ToString();
   try {
      outputBlock.Text += Double.Parse(value) + "\n";
   }   
   catch (OverflowException) {
      outputBlock.Text += String.Format("{0} is outside the range of the Double type.\n",
                        value);
   }

   value = Double.MaxValue.ToString();
   try {
      outputBlock.Text += Double.Parse(value) + "\n";
   }
   catch (OverflowException) {
      outputBlock.Text += String.Format("{0} is outside the range of the Double type.\n",
                        value);
   }
// The example displays the following output:
//    -1.79769313486232E+308 is outside the range of the Double type.
//    1.79769313486232E+308 is outside the range of the Double type.

Public Function GetDouble(value As String) As Double
   Dim culture As CultureInfo = Nothing
   Dim number As Double

   ' Throw exception if string is empty.
   If String.IsNullOrEmpty(value) Then _
      Throw New ArgumentNullException("The input string is invalid.")

   ' Determine if value can be parsed using current culture.
   Try
      culture = CultureInfo.CurrentCulture
      number = Double.Parse(value, culture)
      Return number
   Catch 
   End Try
   ' If Parse operation fails, see if there's a neutral culture.
   Try 
      culture = culture.Parent
      number = Double.Parse(value, culture)
      Return number
   Catch 
   End Try
   ' If there is no neutral culture or if parse operation fails, use
   ' the invariant culture.
   culture = CultureInfo.InvariantCulture
   Try 
      number = Double.Parse(value, culture)
      Return number
   ' All attempts to parse the string have failed. Rethrow the exception.
   Catch e As FormatException
      Throw New FormatException(String.Format("Unable to parse '{0}'.", value), _ 
                                e)
   End Try
End Function

public static double GetDouble(string value)
{
   double number;
   CultureInfo culture = null;

   // Return if string is empty
   if (String.IsNullOrEmpty(value))
      throw new ArgumentNullException("The input string is invalid.");

   // Determine if value can be parsed using current culture.
   try
   {
      culture = CultureInfo.CurrentCulture;
      number = double.Parse(value, culture);
      return number;
   }
   catch {}
   // If Parse operation fails, see if there's a neutral culture.
   try {
      culture = culture.Parent;
      number = double.Parse(value, culture);
      return number;
   }   
   catch {}
   // If there is no neutral culture or if parse operation fails, use
   // the invariant culture.
   culture = CultureInfo.InvariantCulture;
   try {
      number = double.Parse(value, culture);
      return number;
   }
   // All attempts to parse the string have failed; rethrow the exception.
   catch (FormatException e)
   {
      throw new FormatException(String.Format("Unable to parse '{0}'.", value), 
                                e);
   }
}