TryParse Method (String, UInt64)
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UInt64.TryParse Method (String, UInt64%)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Tries to convert the string representation of a number to its 64-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.

This API is not CLS-compliant. The CLS-compliant alternative is Parse(String).

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

public static bool TryParse(
	string s,
	out ulong result


Type: System.String
A string that represents the number to convert.
Type: System.UInt64 %
When this method returns, contains the 64-bit unsigned integer value that is 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, is not of the correct format, or represents a number less than UInt64.MinValue or greater than UInt64.MaxValue. This parameter is passed uninitialized.

Return Value

Type: System.Boolean
true if s was converted successfully; otherwise, false.

The TryParse(String, UInt64) method is like the Parse(String) method, except that it does not throw an exception if the conversion fails. This method eliminates the need to use exception handling to test for a FormatException if s is invalid and cannot be successfully parsed.

The s parameter should be the string representation of a decimal number in the following form:


Elements in square brackets ('[' and ']') are optional. The following table describes each element.




An optional white space.


An optional sign. Valid sign characters are determined by the NumberFormatInfo.NegativeSign and NumberFormatInfo.PositiveSign properties of the current culture.


A sequence of digits ranging from 0 to 9.

The s parameter is interpreted by using the NumberStyles.Integer style. In addition to the decimal digits, only leading and trailing spaces with a leading sign are allowed. To explicitly define the style elements with the culture-specific formatting information that can be present in s, call the TryParse(String, NumberStyles, IFormatProvider, UInt64) method.


The string specified by the s parameter cannot contain any group separators or decimal separator, and it cannot have a fractional portion.

The s parameter is parsed using the formatting information in a NumberFormatInfo object initialized for the current system culture. For more information, see NumberFormatInfo.CurrentInfo.

This overload interprets all digits in the s parameter as decimal digits. To parse the string representation of a hexadecimal number, call the TryParse(String, NumberStyles, IFormatProvider, UInt64) overload instead.

The following example calls the TryParse(String, UInt64) method once for each element in a string array.

string[] numericStrings = { "1293.8", "+1671.7", "28347.", 
                            "   33113684  ", "(0)", "-0", "+1293617", 
                            "18-", "119870", "31,024", "  3127094 ",  
                            "0070000" };
ulong number;
foreach (string numericString in numericStrings)
   if (UInt64.TryParse(numericString, out number))
      outputBlock.Text += String.Format("Converted '{0}' to {1}.", numericString, number) + "\n";
      outputBlock.Text += String.Format("Cannot convert '{0}' to a UInt64.", numericString) + "\n";
// The example displays the following output:
//       Cannot convert '1293.8' to a UInt64.
//       Cannot convert '+1671.7' to a UInt64.
//       Cannot convert '28347.' to a UInt64.
//       Converted '   33113684  ' to 33113684.
//       Cannot convert '(0)' to a UInt64.
//       Converted '-0' to 0.
//       Converted '+1293617' to 1293617.
//       Cannot convert '18-' to a UInt64.
//       Converted '119870' to 119870.
//       Cannot convert '31,024' to a UInt64.
//       Converted '  3127094 ' to 3127094.
//       Converted '0070000' to 70000.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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