C# UInt64 TryParse(String, NumberStyles, IFormatProvider, UInt64)

Description

UInt64 TryParse(String, NumberStyles, IFormatProvider, UInt64)tries to convert the string representation of a number in a specified style and culture-specific format to its 64-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.

Syntax

UInt64.TryParse(String, NumberStyles, IFormatProvider, UInt64) has the following syntax.


[CLSCompliantAttribute(false)]/* ww  w.ja  v  a  2  s . c  om*/
public static bool TryParse(
  string s,
  NumberStyles style,
  IFormatProvider provider,
  out ulong result
)

Parameters

UInt64.TryParse(String, NumberStyles, IFormatProvider, UInt64) has the following parameters.

s - A string that represents the number to convert. The string is interpreted by using the style specified by the style parameter.
style - A bitwise combination of enumeration values that indicates the permitted format of s. A typical value to specify is NumberStyles.Integer.
provider - An object that supplies culture-specific formatting information about s.
result - When this method returns, contains the 64-bit unsigned integer value equivalent to the number contained in s, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s parameter is null or String.Empty, is not in a format compliant with style, or represents a number less than UInt64.MinValue or greater than UInt64.MaxValue. This parameter is passed uninitialized.

Returns

UInt64.TryParse(String, NumberStyles, IFormatProvider, UInt64) method returns true if s was converted successfully; otherwise, false.

Example

The following example calls the TryParse(String, NumberStyles, IFormatProvider, UInt64) method with a number of different strings and NumberStyles values.


using System;/*  w w w.  j a v a2 s.  c o  m*/
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string numericString;
      NumberStyles styles;

      numericString = "1234564";
      styles = NumberStyles.Integer;
      CallTryParse(numericString, styles);

      numericString = "-12343";
      styles = NumberStyles.None;
      CallTryParse(numericString, styles);

      numericString = "23423423.00";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(numericString, styles);

      numericString = "12345.72";
      styles = NumberStyles.Integer | NumberStyles.AllowDecimalPoint;
      CallTryParse(numericString, styles);

      numericString = "42342310E-01";
      styles = NumberStyles.Integer | NumberStyles.AllowExponent;
      CallTryParse(numericString, styles); 

      numericString = "9234E-01";
      CallTryParse(numericString, styles);

      numericString = "234E01";
      CallTryParse(numericString, styles); 

      numericString = "FCC86DA1";
      CallTryParse(numericString, NumberStyles.HexNumber);

      numericString = "0x8F8C";
      CallTryParse(numericString, NumberStyles.HexNumber);
   }

   private static void CallTryParse(string stringToConvert, NumberStyles styles)
   {
      ulong number;
      bool result = UInt64.TryParse(stringToConvert, styles, 
                                   CultureInfo.InvariantCulture, out number);
      if (result)
         Console.WriteLine("Converted '{0}' to {1}.", stringToConvert, number);
      else
         Console.WriteLine("Attempted conversion of '{0}' failed.", 
                           Convert.ToString(stringToConvert));
   }
}

The code above generates the following result.