Int64::TryParse Method (String^, Int64%)

 

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

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

public:
static bool TryParse(
	String^ s,
	[OutAttribute] long long% result
)

Parameters

s
Type: System::String^

A string containing a number to convert.

result
Type: System::Int64%

When this method returns, contains the 64-bit signed integer value equivalent of 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 of the correct format, or represents a number less than Int64::MinValue or greater than Int64::MaxValue. This parameter is passed uninitialized; any value originally supplied in result will be overwritten.

Return Value

Type: System::Boolean

true if s was converted successfully; otherwise, false.

The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. It eliminates the need to use exception handling to test for a FormatException in the event that s is invalid and cannot be successfully parsed.

The s parameter contains a number of the form:

[ws][sign]digits[ws]

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

Element

Description

ws

An optional white space.

sign

An optional sign.

digits

A sequence of digits ranging from 0 to 9.

The s parameter is interpreted using the NumberStyles::Integer style. In addition to the decimal digits, only leading and trailing spaces together with a leading sign are allowed. To explicitly define the style elements together with the culture-specific formatting information that can be present in s, use the TryParse(String^, NumberStyles, IFormatProvider^, Int64%) method.

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

This overload of the TryParse method 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^, Int64%) overload.

The following example calls the Int64::TryParse(String^, Int64%) method with a number of different string values.

No code example is currently available or this language may not be supported.

Some of the strings that the TryParse(String^, Int64%) method is unable to convert in this example are:

  • "9432.0". The conversion fails because the string cannot contain a decimal separator; it must contain integral digits only.

  • "16,667". The conversion fails because the string cannot contain group separators; it must contain integral digits only.

  • "(100)". The conversion fails because the string cannot contain a negative sign other than the one defined by the current culture's NumberFormatInfo::NegativeSign and NumberFormatInfo::NumberNegativePattern properties.

  • "01FA". The conversion fails because the string cannot contain hexadecimal digits; it must contain decimal digits only.

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
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
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