C# Double Parse(String, NumberStyles, IFormatProvider)

Description

Double Parse(String, NumberStyles, IFormatProvider) converts the string representation of a number in a specified style and culture-specific format to its double-precision floating-point number equivalent.

Syntax

Double.Parse(String, NumberStyles, IFormatProvider) has the following syntax.

public static double Parse(
  string s,/* ww w.  j a v  a  2 s  . c o  m*/
  NumberStyles style,
  IFormatProvider provider
)

Parameters

Double.Parse(String, NumberStyles, IFormatProvider) has the following parameters.

• s - A string that contains a number to convert.
• style - A bitwise combination of enumeration values that indicate the style elements that can be present in s. A typical value to specify is Float combined with AllowThousands.
• provider - An object that supplies culture-specific formatting information about s.

Returns

Double.Parse(String, NumberStyles, IFormatProvider) method returns A double-precision floating-point number that is equivalent to the numeric value or symbol specified in s.

Example

The following example illustrates the use of the Parse(String, NumberStyles, IFormatProvider) method to parse a string value to double.

/*from ww  w.  j  a  v a 2  s. c o  m*/
using System;
using System.Globalization;

public class Temperature
{
   public static void Main()
   {
      string value;
      NumberStyles styles;
      IFormatProvider provider;
      Temperature temp;

      value = "25,3";
      styles = NumberStyles.Float;
      provider = CultureInfo.CreateSpecificCulture("fr-FR");
      double d = Double.Parse(value, styles, provider);


      value = " (40)";
      styles = NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite 
               | NumberStyles.AllowParentheses;
      provider = NumberFormatInfo.InvariantInfo;
       d = Double.Parse(value, styles, provider);


      value = "5,778E03";      // Approximate surface temperature of the Sun
      styles = NumberStyles.AllowDecimalPoint | NumberStyles.AllowThousands |
               NumberStyles.AllowExponent;
      provider = CultureInfo.CreateSpecificCulture("en-GB"); 
       d = Double.Parse(value, styles, provider);

   }
}

The code above generates the following result.