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VB.NET字符串轉(zhuǎn)義詳細(xì)概念解析
雖然說(shuō)VB.NET中有很多東西是其他語(yǔ)言沒(méi)有的，但是同時(shí)其他語(yǔ)言具有的一些特點(diǎn)，這款編程語(yǔ)言也是不具備的。不過(guò)我們可以通過(guò)其他的方式來(lái)實(shí)現(xiàn)。比如，眾所周知，VB中沒(méi)有C#的字符串轉(zhuǎn)義語(yǔ)法。#t#
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C#中可以寫(xiě)
- string s = "This is a
string with newline.\n";
而VB.NET字符串轉(zhuǎn)義的只能寫(xiě)
- Dim s = "This is a string
with newline." & vbLf
人們渴望一個(gè)和C#中的"@"字符串正好相反的語(yǔ)法：
- string s = @"This is a string
with '\n' literal.\n";Dim s =
@"This is a string with newline.\n"
但是，這種VB.NET字符串轉(zhuǎn)義語(yǔ)法還沒(méi)有被加入。
于是，我通過(guò)使用擴(kuò)展函數(shù)，實(shí)現(xiàn)了比較接近的語(yǔ)法。
- Dim s = "This is a string
with newline.\n".Descape
另外，還對(duì)String.Format進(jìn)行了類(lèi)似處理
- Dim s2 = "This is a
string that is {0}".
Formats("formated.")
VB.NET字符串轉(zhuǎn)義的具體實(shí)現(xiàn)如下：
- '
- ' File: StringDescape.vb
- ' Description: VB.Net字符串轉(zhuǎn)義語(yǔ)法糖
< Visual Basic 9>- ' Version: 2008.09.28.
- ' (cc) F.R.C. 按照 Creative
Commons Public Domain Dedication L
icense 捐獻(xiàn)- ' http://creativecommons.org/
licenses/publicdomain/- '
- Imports System
- Imports System.Collections.Generic
- Imports System.Text
- Imports System.Text.RegularExpressions
- Imports System.Runtime.CompilerServices
- Imports Microsoft.VisualBasic
- /**/''' < summary>字符串轉(zhuǎn)義< /summary>
- Public Module StringDescapeModule StringDescape
- /**/''' < summary>字符串反轉(zhuǎn)義函數(shù)< /summary>
- ''' < remarks>
- ''' \0 與null \u0000 匹配
- ''' \a 與響鈴（警報(bào)）\u0007 匹配
- ''' \b 與退格符 \u0008 匹配
- ''' \t 與 Tab 符 \u0009 匹配
- ''' \r 與回車(chē)符 \u000D 匹配
- ''' \v 與垂直 Tab 符 \u000B 匹配
- ''' \f 與換頁(yè)符 \u000C 匹配
- ''' \n 與換行符 \u000A 匹配
- ''' \e 與 Esc 符 \u001B 匹配
- ''' \x?? 與 \u00?? 匹配
- ''' \u???? 與對(duì)應(yīng)的Unicode字符對(duì)應(yīng)
- ''' < /remarks>
- < Extension()> Public Function Descape
()Function Descape(ByVal This As
String) As String- Dim m = r.Match(This)
- If Not m.Success Then Throw New
InvalidCastException
- Dim ss As New SortedList(Of
Integer, String)- For Each c As Capture In m.Groups.
Item("SingleEscape").Captures- ss.Add(c.Index, SingleEscapeDict
(c.Value))- Next
- For Each c As Capture In m.Groups.
Item("UnicodeEscape").Captures- ss.Add(c.Index, ChrW(CInt("&H"
& c.Value)))- Next
- For Each c As Capture In m.Groups.
Item("ErrorEscape").Captures- Throw New ArgumentException("
ErrorEscape: Ch " & (c.Index + 1)
& " " & c.Value)- Next
- For Each c As Capture In m.Groups.
Item("Normal").Captures- ss.Add(c.Index, c.Value)
- Next
- Dim sb As New StringBuilder
- For Each s In ss.Values
- sb.Append(s)
- Next
- Return sb.ToString
- End Function
- /**/''' < summary>將指定的 String
中的格式項(xiàng)替換為指定的 Object 實(shí)例的值
的文本等效項(xiàng)。< /summary>- < Extension()> Public Function Formats
()Function Formats(ByVal This As String,
ByVal arg0 As Object) As String- Return String.Format(This, arg0)
- End Function
- /**/''' < summary>將指定的 String
中的格式項(xiàng)替換為兩個(gè)指定的 Object 實(shí)例的
值的文本等效項(xiàng)。< /summary>- < Extension()> Public Function Formats
()Function Formats(ByVal This As String,
ByVal arg0 As Object, ByVal arg1 As
Object) As String- Return String.Format(This, arg0, arg1)
- End Function
- /**/''' < summary>將指定的 String 中的
格式項(xiàng)替換為三個(gè)指定的 Object 實(shí)例的值的文本
等效項(xiàng)。< /summary>- < Extension()> Public Function Formats
()Function Formats(ByVal This As String,
ByVal arg0 As Object, ByVal arg1 As Object,
ByVal arg2 As Object) As String- Return String.Format(This, arg0, arg1, arg2)
- End Function
- /**/''' < summary>將指定 String 中的格式
項(xiàng)替換為指定數(shù)組中相應(yīng) Object 實(shí)例的值的文
本等效項(xiàng)。< /summary>- < Extension()> Public Function Formats()
Function Formats(ByVal This As String,
ByVal ParamArray args As Object()) As String- Return String.Format(This, args)
- End Function
- /**/''' < summary>將指定 String 中的格式項(xiàng)
替換為指定數(shù)組中相應(yīng) Object 實(shí)例的值的文本等效項(xiàng)。
指定的參數(shù)提供區(qū)域性特定的格式設(shè)置信息。< /summary>- < Extension()> Public Function Formats()Function
Formats(ByVal This As String, ByVal provider
As IFormatProvider, ByVal ParamArray args
As Object()) As String- Return String.Format(provider, This, args)
- End Function
- Private ReadOnly Property SingleEscapeDict()
Property SingleEscapeDict() As Dictionary
(Of String, String)- Get
- Static d As Dictionary(Of String, String)
- If d IsNot Nothing Then Return d
- d = New Dictionary(Of String, String)
- d.Add("\", "\") 'backslash
- d.Add("0", ChrW(0)) 'null
- d.Add("a", ChrW(7)) 'alert (beep)
- d.Add("b", ChrW(8)) 'backspace
- d.Add("f", ChrW(&HC)) 'form feed
- d.Add("n", ChrW(&HA)) 'newline (lf)
- d.Add("r", ChrW(&HD)) 'carriage return (cr)
- d.Add("t", ChrW(9)) 'horizontal tab
- d.Add("v", ChrW(&HB)) 'vertical tab
- Return d
- End Get
- End Property
- Private ReadOnly Property SingleEscapes
()Property SingleEscapes() As String- Get
- Static s As String
- If s IsNot Nothing Then Return s
- Dim Chars As New List(Of String)
- For Each c In "\0abfnrtv"
- Chars.Add(Regex.Escape(c))
- Next
- s = "\\(?< SingleEscape>" & String.
Join("|", Chars.ToArray) & ")"- Return s
- End Get
- End Property
- Private UnicodeEscapes As String =
"\\[uU](?< UnicodeEscape>[0-9A-Fa-f]{4})
|\\x(?< UnicodeEscape>[0-9A-Fa-f]{2})"- Private ErrorEscapes As String =
"(?< ErrorEscape>\\)"- Private Normal As String = "(?< Normal>.)"
- Private r As New Regex("^" & "(
" & SingleEscapes & "|" & Unicode
Escapes & "|" & ErrorEscapes & "|" &
Normal & ")*" & "$", RegexOptions.
ExplicitCapture)- End Module
希望大家可以理解VB.NET字符串轉(zhuǎn)義這段代碼編寫(xiě)方法。
新聞標(biāo)題：VB.NET字符串轉(zhuǎn)義詳細(xì)概念解析
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