本文整理汇总了VB.NET中System.Numerics.BigInteger.Parse方法的典型用法代码示例。如果您正苦于以下问题：VB.NET BigInteger.Parse方法的具体用法？VB.NET BigInteger.Parse怎么用？VB.NET BigInteger.Parse使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Numerics.BigInteger的用法示例。
在下文中一共展示了BigInteger.Parse方法的7个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1:
Dim stringToParse As String = String.Empty
Try
' Parse two strings.
Dim string1, string2 As String
string1 = "12347534159895123"
string2 = "987654321357159852"
stringToParse = string1
Dim number1 As BigInteger = BigInteger.Parse(stringToParse)
Console.WriteLine("Converted '{0}' to {1:N0}.", stringToParse, number1)
stringToParse = string2
Dim number2 As BigInteger = BigInteger.Parse(stringToParse)
Console.WriteLine("Converted '{0}' to {1:N0}.", stringToParse, number2)
' Perform arithmetic operations on the two numbers.
number1 *= 3
number2 *= 2
' Compare the numbers.
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
Catch e As FormatException
Console.WriteLine("Unable to parse {0}.", stringToParse)
End Try输出：
Converted '12347534159895123' to 12,347,534,159,895,123. Converted '987654321357159852' to 987,654,321,357,159,852. 1975308642714319704 is greater than 37042602479685369.
示例2: succeed
Dim number As BigInteger
' Method should succeed (white space and sign allowed)
number = BigInteger.Parse(" -68054 ", NumberStyles.Integer)
Console.WriteLine(number)
' Method should succeed (string interpreted as hexadecimal)
number = BigInteger.Parse("68054", NumberStyles.AllowHexSpecifier)
Console.WriteLine(number)
' Method call should fail: sign not allowed
Try
number = BigInteger.Parse(" -68054 ", NumberStyles.AllowLeadingWhite _
Or NumberStyles.AllowTrailingWhite)
Console.WriteLine(number)
Catch e As FormatException
Console.WriteLine(e.Message)
End Try
' Method call should fail: white space not allowed
Try
number = BigInteger.Parse(" 68054 ", NumberStyles.AllowLeadingSign)
Console.WriteLine(number)
Catch e As FormatException
Console.WriteLine(e.Message)
End Try输出：
-68054 426068 Input string was not in a correct format. Input string was not in a correct format.
示例3: Example
' 导入命名空间
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" }
For Each hexString As String In hexStrings
Dim number As BigInteger = BigInteger.Parse(hexString, NumberStyles.AllowHexSpecifier)
Console.WriteLine("Converted 0x{0} to {1}.", hexString, number)
Next
End Sub
End Module输出：
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.
示例4: GetFormat
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示例5:
Dim number As BigInteger = BigInteger.Parse("~6354129876", New BigIntegerFormatProvider)
' Display value using same formatting information
Console.WriteLine(number.ToString(New BigIntegerFormatProvider))
' Display value using formatting of current culture
Console.WriteLine(number)示例6: NumberFormatInfo
Dim fmt As New NumberFormatInfo()
fmt.NegativeSign = "~"
Dim number As BigInteger = BigInteger.Parse("~6354129876", fmt)
' Display value using same formatting information
Console.WriteLine(number.ToString(fmt))
' Display value using formatting of current culture
Console.WriteLine(number)示例7: BigIntegerFormatProvider
' Call parse with default values of style and provider
Console.WriteLine(BigInteger.Parse(" -300 ", _
NumberStyles.Integer, CultureInfo.CurrentCulture))
' Call parse with default values of style and provider supporting tilde as negative sign
Console.WriteLine(BigInteger.Parse(" ~300 ", _
NumberStyles.Integer, New BigIntegerFormatProvider()))
' Call parse with only AllowLeadingWhite and AllowTrailingWhite
' Exception thrown because of presence of negative sign
Try
Console.WriteLIne(BigInteger.Parse(" ~300 ", _
NumberStyles.AllowLeadingWhite Or NumberStyles.AllowTrailingWhite, _
New BigIntegerFormatProvider()))
Catch e As FormatException
Console.WriteLine("{0}: {1} {2}", e.GetType().Name, vbCrLf, e.Message)
End Try
' Call parse with only AllowHexSpecifier
' Exception thrown because of presence of negative sign
Try
Console.WriteLIne(BigInteger.Parse("-3af", NumberStyles.AllowHexSpecifier, _
New BigIntegerFormatProvider()))
Catch e As FormatException
Console.WriteLine("{0}: {1} {2}", e.GetType().Name, vbCrLf, e.Message)
End Try
' Call parse with only NumberStyles.None
' Exception thrown because of presence of white space and sign
Try
Console.WriteLIne(BigInteger.Parse(" -300 ", NumberStyles.None, _
New BigIntegerFormatProvider()))
Catch e As FormatException
Console.WriteLine("{0}: {1} {2}", e.GetType().Name, vbCrLf, e.Message)
End Try输出：
-300 -300 FormatException: The value could not be parsed. FormatException: The value could not be parsed. FormatException: The value could not be parsed.