BigInteger.TryParse Method
Definition
Important
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Tries to convert the string representation of a number to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded.
Overloads
TryParse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider, BigInteger) |
Tries to convert the string representation of a number to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded. |
TryParse(String, IFormatProvider, BigInteger) |
Tries to parse a string into a value. |
TryParse(ReadOnlySpan<Char>, IFormatProvider, BigInteger) |
Tries to parse a span of characters into a value. |
TryParse(String, BigInteger) |
Tries to convert the string representation of a number to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded. |
TryParse(ReadOnlySpan<Char>, BigInteger) |
Tries to convert the representation of a number contained in the specified read-only character span, to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded. |
TryParse(String, NumberStyles, IFormatProvider, BigInteger) |
Tries to convert the string representation of a number in a specified style and culture-specific format to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded. |
TryParse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider, BigInteger)
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
Tries to convert the string representation of a number to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded.
public:
static bool TryParse(ReadOnlySpan<char> value, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result);
public:
static bool TryParse(ReadOnlySpan<char> value, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result) = System::Numerics::INumberBase<System::Numerics::BigInteger>::TryParse;
public static bool TryParse (ReadOnlySpan<char> value, System.Globalization.NumberStyles style, IFormatProvider? provider, out System.Numerics.BigInteger result);
public static bool TryParse (ReadOnlySpan<char> value, System.Globalization.NumberStyles style, IFormatProvider provider, out System.Numerics.BigInteger result);
static member TryParse : ReadOnlySpan<char> * System.Globalization.NumberStyles * IFormatProvider * BigInteger -> bool
Public Shared Function TryParse (value As ReadOnlySpan(Of Char), style As NumberStyles, provider As IFormatProvider, ByRef result As BigInteger) As Boolean
Parameters
- value
- ReadOnlySpan<Char>
The representation of a number as a read-only span of characters.
- style
- NumberStyles
A bitwise combination of enumeration values that indicates the style elements that can be present in value
. A typical value to specify is Integer.
- provider
- IFormatProvider
An object that supplies culture-specific formatting information about value
.
- result
- BigInteger
When this method returns, contains the BigInteger equivalent to the number that is contained in value
, or Zero if the conversion failed. The conversion fails if the value
parameter is an empty character span or is not in a format that is compliant with style
. This parameter is passed uninitialized.
Returns
true
if value
was converted successfully; otherwise, false
.
Exceptions
style
is not a NumberStyles value.
-or-
style
includes the AllowHexSpecifier or HexNumber flag along with another value.
Remarks
This overload is like the Parse(ReadOnlySpan<Char>, NumberStyles, IFormatProvider) 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 value
is invalid and cannot be parsed successfully.
The style
parameter defines the style elements (such as white space or a positive or negative sign) that are allowed in the value
parameter for the parse operation to succeed. It must be a combination of bit flags from the NumberStyles enumeration. Depending on the value of style
, the value
parameter may include the following elements:
[ws][$][sign][digits,]digits[.fractional_digits][E[sign]exponential_digits][ws]
If the style
parameter includes AllowHexSpecifier, the value
parameter may include the following elements:
[ws]hexdigits[ws]
Elements in square brackets ([ and ]) are optional. The following table describes each element.
Element | Description |
---|---|
ws | Optional white space. White space can appear at the start of value if style includes the NumberStyles.AllowLeadingWhite flag, or at the end of value if style includes the NumberStyles.AllowTrailingWhite flag. |
$ | A culture-specific currency symbol. Its position in value is defined by the CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. The currency symbol can appear in value if style includes the NumberStyles.AllowCurrencySymbol flag. |
sign | An optional sign. The sign can appear at the start of value if style includes the NumberStyles.AllowLeadingSign flag, and it can appear at the end of value if style includes the NumberStyles.AllowTrailingSign flag. Parentheses can be used in value to indicate a negative value if style includes the NumberStyles.AllowParentheses flag. |
digits | A sequence of digits from 0 through 9. |
, | A culture-specific group separator. The group separator of the culture specified by provider can appear in value if style includes the NumberStyles.AllowThousands flag. |
. | A culture-specific decimal point symbol. The decimal point symbol of the culture specified by provider can appear in value if style includes the NumberStyles.AllowDecimalPoint flag. |
fractional_digits | One or more occurrences of the digit 0. Fractional digits can appear in value only if style includes the NumberStyles.AllowDecimalPoint flag. |
E | The "e" or "E" character, which indicates that the value is represented in exponential (scientific) notation. The value parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. |
exponential_digits | A sequence of digits from 0 through 9. The value parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. |
hexdigits | A sequence of hexadecimal digits from 0 through f, or 0 through F. |
Note
Any terminating NUL (U+0000) characters in s
are ignored by the parsing operation, regardless of the value of the style
argument.
Non-composite NumberStyles values |
Elements permitted in value in addition to digits |
---|---|
None | Decimal digits only. |
AllowDecimalPoint | The decimal point (.) and fractional_digits elements. However, fractional_digits must consist of only one or more 0 digits, or the method returns false . |
AllowExponent | The "e" or "E" character, which indicates exponential notation, along with exponential_digits. If value represents a number in exponential notation, it cannot have a non-zero, fractional component. |
AllowLeadingWhite | The ws element at the start of value . |
AllowTrailingWhite | The ws element at the end of value . |
AllowLeadingSign | The sign element before digits. |
AllowTrailingSign | The sign element after digits. |
AllowParentheses | The sign element in the form of parentheses enclosing the numeric value. |
AllowThousands | The group separator (,) element. |
AllowCurrencySymbol | The currency ($) element. |
Currency | All elements. However, value cannot represent a hexadecimal number or a number in exponential notation. |
Float | The ws element at the start or end of value , sign at the start of value , and the decimal point (.) symbol. The value parameter can also use exponential notation. |
Number | The ws, sign, group separator (,), and decimal point (.) elements. |
Any | All elements. However, value cannot represent a hexadecimal number. |
If the NumberStyles.AllowHexSpecifier flag is used, value
must be a hexadecimal value. The only other flags that can be present in style
are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (The NumberStyles enumeration has a composite style, HexNumber, that includes both white-space flags.)
The provider
parameter is an IFormatProvider implementation. Its GetFormat method returns a NumberFormatInfo object that provides culture-specific information about the format of value
. The provider
parameter can be any one of the following:
A CultureInfo object that represents the culture that supplies formatting information. Its GetFormat method returns the NumberFormatInfo object that provides numeric formatting information for that culture.
A NumberFormatInfo object that provides numeric formatting information. (Its implementation of GetFormat just returns itself.)
A custom object that implements IFormatProvider. Its GetFormat method instantiates and returns the NumberFormatInfo object that provides formatting information.
If provider
is null
, the NumberFormatInfo object for the current culture is used.
See also
Applies to
TryParse(String, IFormatProvider, BigInteger)
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
Tries to parse a string into a value.
public:
static bool TryParse(System::String ^ s, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result) = IParsable<System::Numerics::BigInteger>::TryParse;
public static bool TryParse (string? s, IFormatProvider? provider, out System.Numerics.BigInteger result);
static member TryParse : string * IFormatProvider * BigInteger -> bool
Public Shared Function TryParse (s As String, provider As IFormatProvider, ByRef result As BigInteger) As Boolean
Parameters
- s
- String
The string to parse.
- provider
- IFormatProvider
An object that provides culture-specific formatting information about s
.
- result
- BigInteger
When this method returns, contains the result of successfully parsing s
or an undefined value on failure.
Returns
true
if s
was successfully parsed; otherwise, false
.
Applies to
TryParse(ReadOnlySpan<Char>, IFormatProvider, BigInteger)
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
Tries to parse a span of characters into a value.
public:
static bool TryParse(ReadOnlySpan<char> s, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result) = ISpanParsable<System::Numerics::BigInteger>::TryParse;
public static bool TryParse (ReadOnlySpan<char> s, IFormatProvider? provider, out System.Numerics.BigInteger result);
static member TryParse : ReadOnlySpan<char> * IFormatProvider * BigInteger -> bool
Public Shared Function TryParse (s As ReadOnlySpan(Of Char), provider As IFormatProvider, ByRef result As BigInteger) As Boolean
Parameters
- s
- ReadOnlySpan<Char>
The span of characters to parse.
- provider
- IFormatProvider
An object that provides culture-specific formatting information about s
.
- result
- BigInteger
When this method returns, contains the result of successfully parsing s
, or an undefined value on failure.
Returns
true
if s
was successfully parsed; otherwise, false
.
Applies to
TryParse(String, BigInteger)
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
Tries to convert the string representation of a number to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded.
public:
static bool TryParse(System::String ^ value, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result);
public static bool TryParse (string value, out System.Numerics.BigInteger result);
public static bool TryParse (string? value, out System.Numerics.BigInteger result);
static member TryParse : string * BigInteger -> bool
Public Shared Function TryParse (value As String, ByRef result As BigInteger) As Boolean
Parameters
- value
- String
The string representation of a number.
- result
- BigInteger
When this method returns, contains the BigInteger equivalent to the number that is contained in value
, or zero (0) if the conversion fails. The conversion fails if the value
parameter is null
or is not of the correct format. This parameter is passed uninitialized.
Returns
true
if value
was converted successfully; otherwise, false
.
Exceptions
value
is null
.
Examples
The following example uses the TryParse(String, BigInteger) method to instantiate two BigInteger objects. If the conversions succeed, it multiplies each object by another number and then calls the Compare method to determine the relationship between the two objects.
BigInteger number1, number2;
bool succeeded1 = BigInteger.TryParse("-12347534159895123", out number1);
bool succeeded2 = BigInteger.TryParse("987654321357159852", out number2);
if (succeeded1 && succeeded2)
{
number1 *= 3;
number2 *= 2;
switch (BigInteger.Compare(number1, number2))
{
case -1:
Console.WriteLine("{0} is greater than {1}.", number2, number1);
break;
case 0:
Console.WriteLine("{0} is equal to {1}.", number1, number2);
break;
case 1:
Console.WriteLine("{0} is greater than {1}.", number1, number2);
break;
}
}
else
{
if (! succeeded1)
Console.WriteLine("Unable to initialize the first BigInteger value.");
if (! succeeded2)
Console.WriteLine("Unable to initialize the second BigInteger value.");
}
// The example displays the following output:
// 1975308642714319704 is greater than -37042602479685369.
let mutable number1 = BigInteger.Zero
let mutable number2 = BigInteger.Zero
let succeeded1 = BigInteger.TryParse("-12347534159895123", &number1)
let succeeded2 = BigInteger.TryParse("987654321357159852", &number2)
if succeeded1 && succeeded2 then
number1 <- number1 * 3I
number2 <- number2 * 2I
match BigInteger.Compare(number1, number2) with
| -1 -> printfn $"{number2} is greater than {number2}."
| 0 -> printfn $"{number1} is equal to {number2}."
| 1
| _ -> printfn $"{number1} is greater than {number2}."
else
if not succeeded1 then
printfn "Unable to initialize the first BigInteger value."
if not succeeded2 then
printfn "Unable to initialize the second BigInteger value."
// The example displays the following output:
// 1975308642714319704 is greater than -37042602479685369.
Dim number1 As BigInteger = BigInteger.Zero
Dim number2 As BigInteger = BigInteger.Zero
Dim succeeded1 As Boolean = BigInteger.TryParse("-12347534159895123", number1)
Dim succeeded2 As Boolean = BigInteger.TryParse("987654321357159852", number2)
If succeeded1 AndAlso succeeded2
number1 *= 3
number2 *= 2
Select Case BigInteger.Compare(number1, number2)
Case -1
Console.WriteLine("{0} is greater than {1}.", number2, number1)
Case 0
Console.WriteLine("{0} is equal to {1}.", number1, number2)
Case 1
Console.WriteLine("{0} is greater than {1}.", number1, number2)
End Select
Else
If Not succeeded1 Then
Console.WriteLine("Unable to initialize the first BigInteger value.")
End If
If Not succeeded2 Then
Console.WriteLine("Unable to initialize the second BigInteger value.")
End If
End If
' The example displays the following output:
' 1975308642714319704 is greater than -37042602479685369.
Remarks
The TryParse(String, BigInteger) 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 value
is invalid and cannot be successfully parsed.
The value
parameter should be the string representation of a decimal number in the following form:
[ws][sign]digits[ws]
Elements in square brackets ([ and ]) are optional. The following table describes each element.
Element | Description |
---|---|
ws | Optional white space. |
sign | An optional sign. Valid sign characters are determined by the NumberFormatInfo.NegativeSign and NumberFormatInfo.PositiveSign properties of the current culture. |
digits | A sequence of decimal digits ranging from 0 to 9. |
Note
The string specified by the value
parameter cannot contain any group separators or decimal separator, and it cannot have a decimal portion.
The value
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 value
, call the TryParse(String, NumberStyles, IFormatProvider, BigInteger) method.
The value
parameter is parsed by using the formatting information in a NumberFormatInfo object for the current culture. For more information, see NumberFormatInfo.CurrentInfo.
This overload interprets all digits in the value
parameter as decimal digits. To parse the string representation of a hexadecimal number, call the TryParse(String, NumberStyles, IFormatProvider, BigInteger) overload instead.
See also
Applies to
TryParse(ReadOnlySpan<Char>, BigInteger)
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
Tries to convert the representation of a number contained in the specified read-only character span, to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded.
public:
static bool TryParse(ReadOnlySpan<char> value, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result);
public static bool TryParse (ReadOnlySpan<char> value, out System.Numerics.BigInteger result);
static member TryParse : ReadOnlySpan<char> * BigInteger -> bool
Public Shared Function TryParse (value As ReadOnlySpan(Of Char), ByRef result As BigInteger) As Boolean
Parameters
- value
- ReadOnlySpan<Char>
The representation of a number as a read-only span of characters.
- result
- BigInteger
When this method returns, contains the BigInteger equivalent to the number that is contained in value
, or zero (0) if the conversion fails. The conversion fails if the value
parameter is an empty character span or is not of the correct format. This parameter is passed uninitialized.
Returns
true
if value
was converted successfully; otherwise, false
.
See also
Applies to
TryParse(String, NumberStyles, IFormatProvider, BigInteger)
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
- Source:
- BigInteger.cs
Tries to convert the string representation of a number in a specified style and culture-specific format to its BigInteger equivalent, and returns a value that indicates whether the conversion succeeded.
public:
static bool TryParse(System::String ^ value, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result);
public:
static bool TryParse(System::String ^ value, System::Globalization::NumberStyles style, IFormatProvider ^ provider, [Runtime::InteropServices::Out] System::Numerics::BigInteger % result) = System::Numerics::INumberBase<System::Numerics::BigInteger>::TryParse;
public static bool TryParse (string value, System.Globalization.NumberStyles style, IFormatProvider provider, out System.Numerics.BigInteger result);
public static bool TryParse (string? value, System.Globalization.NumberStyles style, IFormatProvider? provider, out System.Numerics.BigInteger result);
static member TryParse : string * System.Globalization.NumberStyles * IFormatProvider * BigInteger -> bool
Public Shared Function TryParse (value As String, style As NumberStyles, provider As IFormatProvider, ByRef result As BigInteger) As Boolean
Parameters
- value
- String
The string representation of a number. The string is interpreted using the style specified by style
.
- style
- NumberStyles
A bitwise combination of enumeration values that indicates the style elements that can be present in value
. A typical value to specify is Integer.
- provider
- IFormatProvider
An object that supplies culture-specific formatting information about value
.
- result
- BigInteger
When this method returns, contains the BigInteger equivalent to the number that is contained in value
, or Zero if the conversion failed. The conversion fails if the value
parameter is null
or is not in a format that is compliant with style
. This parameter is passed uninitialized.
Returns
true
if the value
parameter was converted successfully; otherwise, false
.
Exceptions
style
is not a NumberStyles value.
-or-
style
includes the AllowHexSpecifier or HexNumber flag along with another value.
Examples
The following example makes some calls to the TryParse(String, NumberStyles, IFormatProvider, BigInteger) method using various combinations of values for the style
and provider
parameters.
string numericString;
BigInteger number = BigInteger.Zero;
// Call TryParse with default values of style and provider.
numericString = " -300 ";
if (BigInteger.TryParse(numericString, NumberStyles.Integer,
null, out number))
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// Call TryParse with the default value of style and
// a provider supporting the tilde as negative sign.
numericString = " -300 ";
if (BigInteger.TryParse(numericString, NumberStyles.Integer,
new BigIntegerFormatProvider(), out number))
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// Call TryParse with only AllowLeadingWhite and AllowTrailingWhite.
// Method returns false because of presence of negative sign.
numericString = " -500 ";
if (BigInteger.TryParse(numericString,
NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite,
new BigIntegerFormatProvider(), out number))
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// Call TryParse with AllowHexSpecifier and a hex value.
numericString = "F14237FFAAC086455192";
if (BigInteger.TryParse(numericString,
NumberStyles.AllowHexSpecifier,
null, out number))
Console.WriteLine("'{0}' was converted to {1} (0x{1:x}).",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// Call TryParse with AllowHexSpecifier and a negative hex value.
// Conversion fails because of presence of negative sign.
numericString = "-3af";
if (BigInteger.TryParse(numericString, NumberStyles.AllowHexSpecifier,
new BigIntegerFormatProvider(), out number))
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// Call TryParse with only NumberStyles.None.
// Conversion fails because of presence of white space and sign.
numericString = " -300 ";
if (BigInteger.TryParse(numericString, NumberStyles.None,
new BigIntegerFormatProvider(), out number))
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// Call TryParse with NumberStyles.Any and a provider for the fr-FR culture.
// Conversion fails because the string is formatted for the en-US culture.
numericString = "9,031,425,666,123,546.00";
if (BigInteger.TryParse(numericString, NumberStyles.Any,
new CultureInfo("fr-FR"), out number))
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// Call TryParse with NumberStyles.Any and a provider for the fr-FR culture.
// Conversion succeeds because the string is properly formatted
// For the fr-FR culture.
numericString = "9 031 425 666 123 546,00";
if (BigInteger.TryParse(numericString, NumberStyles.Any,
new CultureInfo("fr-FR"), out number))
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number);
else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString);
// The example displays the following output:
// ' -300 ' was converted to -300.
// Conversion of ' -300 ' to a BigInteger failed.
// Conversion of ' -500 ' to a BigInteger failed.
// 'F14237FFAAC086455192' was converted to -69613977002644837412462 (0xf14237ffaac086455192).
// Conversion of '-3af' to a BigInteger failed.
// Conversion of ' -300 ' to a BigInteger failed.
// Conversion of '9,031,425,666,123,546.00' to a BigInteger failed.
// '9 031 425 666 123 546,00' was converted to 9031425666123546.
// Call TryParse with default values of style and provider.
let numericString = " -300 "
match BigInteger.TryParse(numericString, NumberStyles.Integer, null) with
| true, number -> printfn $"The string '{numericString}' parses to {number}"
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// Call TryParse with the default value of style and
// a provider supporting the tilde as negative sign.
let numericString = " -300 "
match BigInteger.TryParse(numericString, NumberStyles.Integer, new BigIntegerFormatProvider()) with
| true, number -> printfn $"The string '{numericString}' parses to {number}"
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// Call TryParse with only AllowLeadingWhite and AllowTrailingWhite.
// Method returns false because of presence of negative sign.
let numericString = " -500 "
match
BigInteger.TryParse(
numericString,
NumberStyles.AllowLeadingWhite ||| NumberStyles.AllowTrailingWhite,
new BigIntegerFormatProvider()
)
with
| true, number -> printfn $"The string '{numericString}' parses to {number}"
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// Call TryParse with AllowHexSpecifier and a hex value.
let numericString = "F14237FFAAC086455192"
match BigInteger.TryParse(numericString, NumberStyles.AllowHexSpecifier, null) with
| true, number -> printfn $"The string '{numericString}' parses to {number}, or 0x{number:x}."
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// Call TryParse with AllowHexSpecifier and a negative hex value.
// Conversion fails because of presence of negative sign.
let numericString = "-3af"
match BigInteger.TryParse(numericString, NumberStyles.AllowHexSpecifier, null) with
| true, number -> printfn $"The string '{numericString}' parses to {number}, or 0x{number:x}."
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// Call TryParse with only NumberStyles.None.
// Conversion fails because of presence of white space and sign.
let numericString = " -300 "
match BigInteger.TryParse(numericString, NumberStyles.None, new BigIntegerFormatProvider()) with
| true, number -> printfn $"The string '{numericString}' parses to {number}"
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// Call TryParse with NumberStyles.Any and a provider for the fr-FR culture.
// Conversion fails because the string is formatted for the en-US culture.
let numericString = "9,031,425,666,123,546.00"
match BigInteger.TryParse(numericString, NumberStyles.Any, new CultureInfo("fr-FR")) with
| true, number -> printfn $"The string '{numericString}' parses to {number}"
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// Call TryParse with NumberStyles.Any and a provider for the fr-FR culture.
// Conversion succeeds because the string is properly formatted
// For the fr-FR culture.
let numericString = "9 031 425 666 123 546,00"
match BigInteger.TryParse(numericString, NumberStyles.Any, new CultureInfo("fr-FR")) with
| true, number -> printfn $"The string '{numericString}' parses to {number}"
| _ -> printfn $"Conversion of {numericString} to a BigInteger failed."
// The example displays the following output:
// ' -300 ' was converted to -300.
// Conversion of ' -300 ' to a BigInteger failed.
// Conversion of ' -500 ' to a BigInteger failed.
// 'F14237FFAAC086455192' was converted to -69613977002644837412462 (0xf14237ffaac086455192).
// Conversion of '-3af' to a BigInteger failed.
// Conversion of ' -300 ' to a BigInteger failed.
// Conversion of '9,031,425,666,123,546.00' to a BigInteger failed.
// '9 031 425 666 123 546,00' was converted to 9031425666123546.
Dim numericString As String
Dim number As BigInteger = BigInteger.Zero
' Call TryParse with default values of style and provider.
numericString = " -300 "
If BigInteger.TryParse(numericString, NumberStyles.Integer,
Nothing, number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' Call TryParse with the default value of style and
' a provider supporting the tilde as negative sign.
numericString = " -300 "
If BigInteger.TryParse(numericString, NumberStyles.Integer,
New BigIntegerFormatProvider(), number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' Call TryParse with only AllowLeadingWhite and AllowTrailingWhite.
' Method returns false because of presence of negative sign.
numericString = " -500 "
If BigInteger.TryParse(numericString,
NumberStyles.AllowLeadingWhite Or NumberStyles.AllowTrailingWhite,
New BigIntegerFormatProvider(), number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' Call TryParse with AllowHexSpecifier and a hex value.
numericString = "F14237FFAAC086455192"
If BigInteger.TryParse(numericString,
NumberStyles.AllowHexSpecifier,
Nothing, number) Then
Console.WriteLine("'{0}' was converted to {1} (0x{1:x}).",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' Call TryParse with AllowHexSpecifier and a negative hex value.
' Conversion fails because of presence of negative sign.
numericString = "-3af"
If BigInteger.TryParse(numericString, NumberStyles.AllowHexSpecifier,
New BigIntegerFormatProvider(), number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' Call TryParse with only NumberStyles.None.
' Conversion fails because of presence of white space and sign.
numericString = " -300 "
If BigInteger.TryParse(numericString, NumberStyles.None,
New BigIntegerFormatProvider(), number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' Call TryParse with NumberStyles.Any and a provider for the fr-FR culture.
' Conversion fails because the string is formatted for the en-US culture.
numericString = "9,031,425,666,123,546.00"
If BigInteger.TryParse(numericString, NumberStyles.Any,
New CultureInfo("fr-FR"), number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' Call TryParse with NumberStyles.Any and a provider for the fr-FR culture.
' Conversion succeeds because the string is properly formatted
' For the fr-FR culture.
numericString = "9 031 425 666 123 546,00"
If BigInteger.TryParse(numericString, NumberStyles.Any,
New CultureInfo("fr-FR"), number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
' The example displays the following output:
' ' -300 ' was converted to -300.
' Conversion of ' -300 ' to a BigInteger failed.
' Conversion of ' -500 ' to a BigInteger failed.
' 'F14237FFAAC086455192' was converted to -69613977002644837412462 (0xf14237ffaac086455192).
' Conversion of '-3af' to a BigInteger failed.
' Conversion of ' -300 ' to a BigInteger failed.
' Conversion of '9,031,425,666,123,546.00' to a BigInteger failed.
' '9 031 425 666 123 546,00' was converted to 9031425666123546.
A number of the individual calls to the TryParse(String, NumberStyles, IFormatProvider, BigInteger) method pass an instance of the following BigIntegerFormatProvider
class, which defines a tilde (~) as the negative sign.
public class BigIntegerFormatProvider : IFormatProvider
{
public object GetFormat(Type formatType)
{
if (formatType == typeof(NumberFormatInfo))
{
NumberFormatInfo numberFormat = new NumberFormatInfo();
numberFormat.NegativeSign = "~";
return numberFormat;
}
else
{
return null;
}
}
}
type BigIntegerFormatProvider() =
interface IFormatProvider with
member _.GetFormat(formatType: Type) =
if formatType = typeof<NumberFormatInfo> then
let numberFormat = new NumberFormatInfo()
numberFormat.NegativeSign <- "~"
numberFormat
else
null
Public Class BigIntegerFormatProvider : Implements IFormatProvider
Public Function GetFormat(formatType As Type) As Object _
Implements IFormatProvider.GetFormat
If formatType Is GetType(NumberFormatInfo) Then
Dim numberFormat As New NumberFormatInfo
numberFormat.NegativeSign = "~"
Return numberFormat
Else
Return Nothing
End If
End Function
End Class
Remarks
The TryParse(String, NumberStyles, IFormatProvider, BigInteger) method is like the Parse(String, NumberStyles, IFormatProvider) 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 value
is invalid and cannot be parsed successfully.
The style
parameter defines the style elements (such as white space or a positive or negative sign) that are allowed in the value
parameter for the parse operation to succeed. It must be a combination of bit flags from the NumberStyles enumeration. Depending on the value of style
, the value
parameter may include the following elements:
[ws][$][sign][digits,]digits[.fractional_digits][E[sign]exponential_digits][ws]
If the style
parameter includes AllowHexSpecifier, the value
parameter may include the following elements:
[ws]hexdigits[ws]
Elements in square brackets ([ and ]) are optional. The following table describes each element.
Element | Description |
---|---|
ws | Optional white space. White space can appear at the start of value if style includes the NumberStyles.AllowLeadingWhite flag, or at the end of value if style includes the NumberStyles.AllowTrailingWhite flag. |
$ | A culture-specific currency symbol. Its position in the string is defined by the CurrencyPositivePattern property of the NumberFormatInfo object returned by the GetFormat method of the provider parameter. The currency symbol can appear in value if style includes the NumberStyles.AllowCurrencySymbol flag. |
sign | An optional sign. The sign can appear at the start of value if style includes the NumberStyles.AllowLeadingSign flag, and it can appear at the end of value if style includes the NumberStyles.AllowTrailingSign flag. Parentheses can be used in value to indicate a negative value if style includes the NumberStyles.AllowParentheses flag. |
digits | A sequence of digits from 0 through 9. |
, | A culture-specific group separator. The group separator of the culture specified by provider can appear in value if style includes the NumberStyles.AllowThousands flag. |
. | A culture-specific decimal point symbol. The decimal point symbol of the culture specified by provider can appear in value if style includes the NumberStyles.AllowDecimalPoint flag. |
fractional_digits | One or more occurrences of the digit 0. Fractional digits can appear in value only if style includes the NumberStyles.AllowDecimalPoint flag. |
E | The "e" or "E" character, which indicates that the value is represented in exponential (scientific) notation. The value parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. |
exponential_digits | A sequence of digits from 0 through 9. The value parameter can represent a number in exponential notation if style includes the NumberStyles.AllowExponent flag. |
hexdigits | A sequence of hexadecimal digits from 0 through f, or 0 through F. |
Note
Any terminating NUL (U+0000) characters in s
are ignored by the parsing operation, regardless of the value of the style
argument.
A string with decimal digits only (which corresponds to the NumberStyles.None flag) always parses successfully. Most of the remaining NumberStyles members control elements that may be present, but are not required to be present, in this input string. The following table indicates how individual NumberStyles members affect the elements that may be present in value
.
Non-composite NumberStyles values |
Elements permitted in value in addition to digits |
---|---|
None | Decimal digits only. |
AllowDecimalPoint | The decimal point (.) and fractional_digits elements. However, fractional_digits must consist of only one or more 0 digits, or the method returns false . |
AllowExponent | The "e" or "E" character, which indicates exponential notation, along with exponential_digits. If value represents a number in exponential notation, it cannot have a non-zero, fractional component. |
AllowLeadingWhite | The ws element at the start of value . |
AllowTrailingWhite | The ws element at the end of value . |
AllowLeadingSign | The sign element before digits. |
AllowTrailingSign | The sign element after digits. |
AllowParentheses | The sign element in the form of parentheses enclosing the numeric value. |
AllowThousands | The group separator (,) element. |
AllowCurrencySymbol | The currency ($) element. |
Currency | All elements. However, value cannot represent a hexadecimal number or a number in exponential notation. |
Float | The ws element at the start or end of value , sign at the start of value , and the decimal point (.) symbol. The value parameter can also use exponential notation. |
Number | The ws, sign, group separator (,), and decimal point (.) elements. |
Any | All elements. However, value cannot represent a hexadecimal number. |
Important
If you use the TryParse method to round-trip the string representation of a BigInteger value that was output by the ToString method, you should use the BigInteger.ToString(String) method with the "R" format specifier to generate the string representation of the BigInteger value. Otherwise, the string representation of the BigInteger preserves only the 50 most significant digits of the original value, and data may be lost when you use the TryParse method to restore the BigInteger value.
If the NumberStyles.AllowHexSpecifier flag is used, value
must be a hexadecimal value. The only other flags that can be present in style
are NumberStyles.AllowLeadingWhite and NumberStyles.AllowTrailingWhite. (The NumberStyles enumeration has a composite style, HexNumber, that includes both white-space flags.)
Note
If value
is the string representation of a hexadecimal number, it cannot be preceded by any decoration (such as 0x
or &h
) that differentiates it as a hexadecimal number. This causes the conversion to fail.
If value
is a hexadecimal string, the TryParse(String, NumberStyles, IFormatProvider, BigInteger) method interprets value
as a negative number stored by using two's complement representation if its first two hexadecimal digits are greater than or equal to 0x80
. In other words, the method interprets the highest-order bit of the first byte in value
as the sign bit. To make sure that a hexadecimal string is correctly interpreted as a positive number, the first digit in value
must have a value of zero. For example, the method interprets 0x80
as a negative value, but it interprets either 0x080
or 0x0080
as a positive value. The following example illustrates the difference between hexadecimal strings that represent negative and positive values.
using System;
using System.Globalization;
using System.Numerics;
public class Example
{
public static void Main()
{
string[] hexStrings = { "80", "E293", "F9A2FF", "FFFFFFFF",
"080", "0E293", "0F9A2FF", "0FFFFFFFF",
"0080", "00E293", "00F9A2FF", "00FFFFFFFF" };
BigInteger number = BigInteger.Zero;
foreach (string hexString in hexStrings)
{
if (BigInteger.TryParse(hexString, NumberStyles.AllowHexSpecifier,
null, out number))
Console.WriteLine("Converted 0x{0} to {1}.", hexString, number);
else
Console.WriteLine("Cannot convert '{0}' to a BigInteger.", hexString);
}
}
}
// The example displays the following output:
// Converted 0x80 to -128.
// Converted 0xE293 to -7533.
// Converted 0xF9A2FF to -417025.
// Converted 0xFFFFFFFF to -1.
// Converted 0x080 to 128.
// Converted 0x0E293 to 58003.
// Converted 0x0F9A2FF to 16360191.
// Converted 0x0FFFFFFFF to 4294967295.
// Converted 0x0080 to 128.
// Converted 0x00E293 to 58003.
// Converted 0x00F9A2FF to 16360191.
// Converted 0x00FFFFFFFF to 4294967295.
open System.Globalization
open System.Numerics
let hexStrings =
[| "80"
"E293"
"F9A2FF"
"FFFFFFFF"
"080"
"0E293"
"0F9A2FF"
"0FFFFFFFF"
"0080"
"00E293"
"00F9A2FF"
"00FFFFFFFF" |]
for hexString in hexStrings do
match BigInteger.TryParse(hexString, NumberStyles.AllowHexSpecifier, null) with
| true, number -> printfn $"Converted 0x{hexString} to {number}."
| _ -> printfn $"Cannot convert '{hexString}' to a BigInteger."
// The example displays the following output:
// Converted 0x80 to -128.
// Converted 0xE293 to -7533.
// Converted 0xF9A2FF to -417025.
// Converted 0xFFFFFFFF to -1.
// Converted 0x080 to 128.
// Converted 0x0E293 to 58003.
// Converted 0x0F9A2FF to 16360191.
// Converted 0x0FFFFFFFF to 4294967295.
// Converted 0x0080 to 128.
// Converted 0x00E293 to 58003.
// Converted 0x00F9A2FF to 16360191.
// Converted 0x00FFFFFFFF to 4294967295.
Imports System.Globalization
Imports System.Numerics
Module Example
Public Sub Main()
Dim hexStrings() As String = { "80", "E293", "F9A2FF", "FFFFFFFF",
"080", "0E293", "0F9A2FF", "0FFFFFFFF",
"0080", "00E293", "00F9A2FF", "00FFFFFFFF" }
Dim number As BigInteger = BigInteger.Zero
For Each hexString As String In hexStrings
If BigInteger.TryParse(hexString, NumberStyles.AllowHexSpecifier,
Nothing, number) Then
Console.WriteLine("Converted 0x{0} to {1}.", hexString, number)
Else
Console.WriteLine("Cannot convert '{0}' to a BigInteger.", hexString)
End If
Next
End Sub
End Module
' The example displays the following output:
' Converted 0x80 to -128.
' Converted 0xE293 to -7533.
' Converted 0xF9A2FF to -417025.
' Converted 0xFFFFFFFF to -1.
' Converted 0x080 to 128.
' Converted 0x0E293 to 58003.
' Converted 0x0F9A2FF to 16360191.
' Converted 0x0FFFFFFFF to 4294967295.
' Converted 0x0080 to 128.
' Converted 0x00E293 to 58003.
' Converted 0x00F9A2FF to 16360191.
' Converted 0x00FFFFFFFF to 4294967295.
The provider
parameter is an IFormatProvider implementation. Its GetFormat method returns a NumberFormatInfo object that provides culture-specific information about the format of value
. The provider
parameter can be any one of the following:
A CultureInfo object that represents the culture that supplies formatting information. Its GetFormat method returns the NumberFormatInfo object that provides numeric formatting information for that culture.
A NumberFormatInfo object that provides numeric formatting information. (Its implementation of GetFormat just returns itself.)
A custom object that implements IFormatProvider. Its GetFormat method instantiates and returns the NumberFormatInfo object that provides formatting information.
If provider
is null
, the NumberFormatInfo object for the current culture is used.